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1 zarlink semiconductor inc. features ? 8,192-channel x 8,192-channel non-blocking unidirectional switching. the backplane and local inputs and outputs can be combined to form a non-blocking switching matrix with 32 stream inputs and 32 stream outputs. ? 4,096-channel x 4,096 channel non-blocking backplane to local stream switch. ? 4,096-channel x 4,096 channel non-blocking local to backplane stream switch. ? 4,096-channel x 4,096 channel non-blocking backplane input to backplane output switch. ? 4,096-channel x 4,096 channel non-blocking local input to local output stream switch. ? rate conversion on all data paths, backplane to local, local to backplane, backplane to backplane and local to local streams. ? backplane port accepts 16 st-bus streams with data rates of 2.048mb/s, 4.096mb/s, 8.192mb/s or 16.384mb/s in any combination. ? local port accepts 16 st-bus streams with data rates of 2.048mb/s, 4.096mb/s, 8.192mb/s or 16.384mb/s, in any combination. ? per-stream channel and bit delay for local input streams. ? per-stream channel and bit delay for backplane input streams. ? per-stream advancement for local output streams. ? per-stream advancement for backplane output streams. ? constant throughput delay for frame integrity. ? per-channel high impedance output control for local and backplane streams. ? per-channel driven-high output control for local and backplane streams. ? high impedance-control outputs for external drivers on backplane and local port. december 2002 ordering information MT90871av 196 ball lbga -40c to +85c MT90871 flexible 8k digital switch (f8kdx) data sheet figure 1 - MT90871 functional block diagram backplane data memories (4,096 channels) ds cs r/ w a14-a0 dta d15-d0 test port microprocessor interface and internal registers v ss (gnd) v dd_core tdi tdo tck trst tms lsto0-15 (4,096 locations) reset local interface connection memory bsti0-15 backplane timing unit fp8i pll lsti0-15 interface backplane bsto0-15 local c8i v dd_io lcst0-1 ode bcst0-1 c8o c16o fp8o fp16o v dd_pll (4,096 locations) connection memory backplane interface local local data memories (4,096 channels) bors lors local timing unit
MT90871 data sheet 2 zarlink semiconductor inc. ? per-channel message mode for local and backplane output streams. ? connection memory block programming for fast device initialization. ? automatic selection between st-bus and gci-bus operation. ? non-multiplexed motorola microprocessor interface. ? ber testing for local and backplane ports. ? conforms to the mandatory requirements of the ieee-1149.1 (jtag) standard. ? memory built-in-self-test (bist), controlled via microprocessor registers. ? 1.8v core supply voltage. ? 3.3v i/o supply voltage. ? 5v tolerant inputs, outputs and i/os. ? per stream subrate switching at 4-bit, 2-bit, 1-bit depending on stream data rate. applications ? central office switches (class 5) ? mediation switches ? class-independent switches ? access concentrators ? scalable tdm-based architectures ? digital loop carriers device overview the MT90871 has two data ports, the backplane and the local port. the backplane port has 16 input and 16 output streams operated at 2.048mb/s, 4.096mb/s, 8.192mb/s or 16.384mb/s, in any combination and the local port has 16 input and 16 output streams operated at 2.048mb/s, 4.096mb/s, 8.192mb/s or 16.384mb/s, in any combination. the MT90871 contains two data memory blocks (backplane and local) to provide the following switching path configurations: ? backplane-to-local, supporting 4k x 4k data switching, ? local-to-backplane, supporting 4k x 4k data switching, ? backplane-to-backplane, supporting 4k x 4k data switching. ? local-to-local, supporting 4k x 4k data switching. the device contains two connection memory blocks, one for the backplane output and one for the local output. data to be output on the serial streams may come from either of the data memories (connection mode) or directly from the connection memory contents (message mode). in connection mode the contents of the connection memory defines, for each output stream and channel, the source stream and channel (stored in data memory) to be switched. in message mode, microprocessor data can be written to the connection memory for broadcast on the output streams on a per channel basis. this feature is useful for transferring control and status information to external circuits or other st-bus devices. the device uses a master frame pulse (fp8i ) and master clock (c8i ) to define the frame boundary and timing for both the backplane port and the local port. the device will automatically detect whether an st-bus or a gci-bus style frame pulse is being used. there is a two frame delay from the time reset is de-asserted to the establishment of full switch functionality. during this period the frame format is determined before switching begins. the device provides fp8o , fp16o , c8o and c16o outputs to support external devices connected to the local port. subrate switching can be accomplished by over-sampling (i.e. 1-bit switching can be achieved by sampling a 2mbps stream at 16mbps). refer to msan-175.
data sheet MT90871 3 zarlink semiconductor inc. a non-multiplexed motorola microprocessor port allows programming of the various device operation modes and switching configurations. the microprocessor port provides access for register read/write, connection memory read/write and data memory read-only operations. the port has a 15-bit address bus, 16-bit data bus and 4 control signals. the microprocessor may monitor channel data in the backplane and local data memories. the mandatory requirements of the ieee-1149.1 (jtag) standard are fully supported via a dedicated test port. the MT90871 is manufactured in a 15mm x 15mm body, 1.0mm ball-pitch, 196-lbga to jedec standard ms-034 bal-2 iss. a. figure 2 - MT90871 lbga connections (196 lbga) pin diagram (as viewed through top of package) a1 corner identified by metallized marking, mold indent, ink dot or right-angled corner 1234567891011121314 b c d e f g h j k l m n a p gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd vdd_io vdd_io vdd_io vdd_io vdd_core vdd_core vdd_core vdd_core gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd vdd_io vdd_io vdd_io vdd_io vdd_io vdd_io vdd_io vdd_io vdd_core vdd_core vdd_core vdd_core vdd_core vdd_core vdd_core vdd_core vdd_core vdd_core vdd_core vdd_core vdd_core vdd_core vdd_core vdd_io vdd_io vdd_io vdd_io vdd_io vdd_io vdd_io vdd_io vdd_io vdd_io lsti13 lsti14 lsti13 lsti10 lsti15 lsti11 lsti12 lsti7 lsti8 lsti7 lsti9 lsti3 lsti4 lsti5 lsti6 lsti1 lsti0 lsti2 lors lsto15 lsto14 lsto11 lsto10 lsto13 lsto12 lsto8 lsto9 lsto7 lsto5 lsto6 lsto4 d15 d14 d13 d12 d10 d9 d11 d8 d7 d6 d5 d4 d3 d2 d1 ic d0 ic ic ic nc c8i vdd_pll nc c16o c8o fp16o fp8o fp8i bsto6 bsto10 bsto12 bsto13 bsto11 bsto9 bsto15 bsto14 bors bsti0 bsti1 bsti2 bsti3 bsti4 bsti5 bsti6 bsti7 bsti8 bsti9 bsti10 bsti11 bsti12 bsti15 bsti13 bsti14 lsto2 lsto3 ic ic lcsto0 lsto1 lsto0 lcsto1 bcsto1 bcsto0 trst tck tdo tdi dta tms reset ode cs r/w ds a14 a13 a12 a11 a10 a9 a8 a7 a6 a5 a2 a4 a3 bsto2 bsto1 a1 bsto4 bsto0 bsto5 bsto3 bsto8 a0 bsto7 ic ic
MT90871 data sheet 4 zarlink semiconductor inc. pin description table name package coordinates description v dd_io d6, d7, d8, d10, e4, e11,f4, f11, g4, g11, h4, h11, j4, j11, k4, k11, l5, l6, l7, l8, l9, l10 power supply for periphery circuits: +3.3v v dd_core e6, e7, e8, e9, f5, f10, g3, g5, g10, h5, h10, h12, j5, j10, k6, k7, k8, k9 power supply for core logic circuits: +1.8v v dd_pll n9 power supply for analog pll: +1.8v v ss (gnd) d4, d11, e5, e10, f6, f7, f8, f9, g6, g7, g8, g9, h6, h7, h8, h9, j6, j7, j8, j9 k5, k10, l4, l11, p1, p13, p14 ground bsti0 - 15 g1, h1, h2, h3, j1, j2, k1, j3, l1, k2, m1, l2, n1, k3, l3, m2 backplane serial input streams 0 to 7 (5v tolerant, internal pull- down). these pins accept serial tdm data streams at a data-rate of: ? 16.384 mb/s (with 256 channels per stream), ? 8.192 mb/s (with 128 channels per stream), ? 4.096 mb/s (with 64 channels per stream), or ? 2.048mb/s (with 32 channels per stream). the data-rate is independently programmable for each input stream. bsto0 - 15 b3, a1, a2, c4, c5, b2, d2, c2, c3, f1, d3, e2, e1, e3, f2, f3 backplane serial output streams 0 to 7 (5v tolerant, three-state outputs). these pins output serial tdm data streams at a data-rate of: ? 16.384 mb/s (with 256 channels per stream), ? 8.192 mb/s (with 128 channels per stream), ? 4.096 mb/s (with 64 channels per stream), or ? 2.048mb/s (with 32 channels per stream). the data-rate is independently programmable for each output stream. refer to descriptions of the bors and ode pins for control of the output high or high-impedance state. bcsto0-1 a13, c10 backplane output channel high impedance control (5v tolerant three-state outputs). active high output enable which may be used to control external buffering of backplane output streams on a per channel basis. bcsto0 is the output enable for bsto[0, 2, 4, 6, 8, 10, 12, 14], bcsto1 is the output enable for bsto[1, 3, 5, 7, 9, 11, 13, 15]. refer to descriptions of the bors and ode pins for control of the output high or high-impedance state.
data sheet MT90871 5 zarlink semiconductor inc. fp8i m10 frame pulse input (5v tolerant). this pin accepts the frame pulse signal. the pulse width may be active for 122ns or 244ns at the frame boundary and the frame pulse width bit (fpw) of the control register must be set low (default) for a 122ns and set high for a the 244ns pulse condition. the device will automatically detect whether an st-bus or gci-bus style frame pulse is applied. c8i p10 master clock input (5v tolerant). this pin accepts a 8.192mhz clock. the internal frame boundary is aligned with the clock falling or rising edge, as controlled by the c8ipol bit of the control register. cs a10 chip select (5v tolerant). active low input used by the microprocessor to enable the microprocessor port access. this input is internally set low during a device reset . ds c8 data strobe (5v tolerant). this active low input is used in conjunction with cs to enable the microprocessor port read and write operations. r/w a9 read/write (5v tolerant). this input controls the direction of the data bus lines (d0-d15) during a microprocessor access. a0 - a14 b1, b4, b5, d5, a3, a4, c6, b6, a5, a6, c7, b7, a7, a8, b8 address 0 - 14 (5v tolerant). these pins form the 15-bit address bus to the internal memories and registers. (address a0 = lsb). d0 - d15 n7, p7, p6, n6, p5, m6, p4, n5, p3, p2, n3, n4, m5, n2, m4, m3 data bus 0 - 15 (5v tolerant). these pins form the 16-bit data bus of the microprocessor port. (data d0 = lsb). dta d9 data transfer acknowledgment (5v tolerant). this active low output indicates that a data bus transfer is complete. a pull-up resistor is required to hold a high level. (max. i ol = 10ma). tms a11 test mode select (5v tolerant with internal pull-up). jtag signal that controls the state transitions of the tap controller. tck b11 test clock (5v tolerant). provides the clock to the jtag test logic. tdi b10 test serial data in (5v tolerant with internal pull-up). jtag serial test instructions and data are shifted in on this pin. tdo a12 test serial data out (5v tolerant three-state output). jtag serial data is output on this pin on the falling edge of tck. this pin is held in high impedance state when jtag is not enabled. trst a14 test reset (5v tolerant with internal pull-up) asynchronously initializes the jtag tap controller to the test-logic-reset state. to be pulsed low during power-up for jtag testing. this pin must be held low for normal functional operation of the device. reset c9 device reset (5v tolerant with internal pull-up). this input (active low) asynchronously applies reset and synchronously releases reset to the device. in the reset state, the outputs lsto0 - 15 and bsto0 - 15 are set to a high or high impedance depending on the state of the lors and bors external control pins, respectively. it clears the device registers and internal counters. this pin must stay low for more than 2 cycles of input clock c8i for the reset to be invoked. pin description table (continued) name package coordinates description
MT90871 data sheet 6 zarlink semiconductor inc. lsti0-15 k14, j13, j14, k13, m14, j12, l14, m13, l13, n14, m12, n12, n13, m11, l12, k12 local serial input streams 0 to 15 (5v tolerant with internal pull- down). these pins accept serial tdm data streams at a data-rate of: ? 16.384 mb/s (with 256 channels per stream), ? 8.192 mb/s (with 128 channels per stream), ? 4.096 mb/s (with 64 channels per stream), or ? 2.048mb/s (with 32 channels per stream). the data-rate is independently programmable for each input stream. c16o m9 c16o output clock (three-state output). a 16.384mhz clock output. the clock falling edge or rising edge is aligned with the local frame boundary, and is determined by the copol bit of the control register. c8o n10 c8o output clock (three-state output). a 8.192mhz clock output. the clock falling edge or rising edge is aligned with the local frame boundary, and is determined by the copol bit of the control register. fp16o p12 frame pulse output (three-state output). frame pulse output is active for 61ns at the frame boundary. the frame pulse, running at a 8khz rate, will be the same format (st-bus or gci-bus) as the input frame pulse (fp8i) . fp8o n11 frame pulse output (three-state output). frame pulse output is active for 122ns at the frame boundary. the frame pulse, running at 8khz rate, will be the same style (st-bus or gci-bus) as the input frame pulse (fp8i) . lsto0 - 15 b13, b14, d14, c14, d12, e14, d13, e13, e12, f14, g14, g12, f12, f13, h14, g13 local serial output streams 0 to 15 (5v tolerant three-state outputs). these pins output serial tdm data streams at a data-rate of: ? 16.384 mb/s (with 256 channels per stream), ? 8.192 mb/s (with 128 channels per stream), ? 4.096 mb/s (with 64 channels per stream), or ? 2.048mb/s (with 32 channels per stream). the data-rate is independently programmable for each output stream. refer to descriptions of the lors and ode pins for control of the output high or high-impedance state. lcsto0-1 c12, b12 local output channel high impedance control (5v tolerant three-state outputs). active high output enable which may be used to control external buffering individually for a set of local output streams on a per channel basis. lcsto0 is the output enable for lsto[0, 2, 4, 6, 8, 10, 12, 14], lcsto1 is the output enable for lsto[1, 3, 5, 7, 9, 11, 13, 15]. refer to descriptions of the lors and ode pins for control of the output high or high-impedance state. pin description table (continued) name package coordinates description
data sheet MT90871 7 zarlink semiconductor inc. ode b9 output drive enable (5v tolerant, internal pull-up). an asynchronous input providing output enable control to the bsto0-15, lsto0-15, bcsto0-1 and lcsto0-1 outputs. when low, the bsto0-15 and lsto0-15 outputs are driven high or high impedance (dependent on the bors and lors pin settings respectively) and the outputs bcsto0-1 and lcsto0-1 are driven low. when high, the outputs bsto0-15, lsto0-15, bcsto0-1 and lcsto0-1 are enabled. bors g2 backplane output reset state (5v tolerant, internal pull-down). asynchronous input. when low, the device will initialize with the bsto0- 15 outputs driven high, and the bcsto0-1 outputs driven low. following initialization, the backplane stream outputs are always active and a high impedance state, if required on a per-channel basis, may be implemented with external buffers controlled by outputs bcsto0-1. when the input is high, the device will initialize with the bsto0-15 outputs at high impedance and the bcsto0-1 outputs are driven low. following initialization, the backplane stream outputs may be set active or high impedance using the ode pin or, on a per-channel basis, with the be bit in backplane connection memory. lors h13 backplane output reset state (5v tolerant, internal pull-down). asynchronous input. when low, the device will initialize with the lsto0- 15 outputs driven high, and the lcsto0-1 outputs driven low. following initialization, the backplane stream outputs are always active and a high impedance state, if required on a per-channel basis, may be implemented with external buffers controlled by outputs lcsto0-1. when the input is high, the device will initialize with the lsto0-15 outputs at high impedance and the lcsto0-1 outputs are driven low. following initialization, the backplane stream outputs may be set active or high impedance using the ode pin or, on a per-channel basis, with the le bit in backplane connection memory. nc p9, p11 no connect. these ball-pads must remain unconnected. ic c1, d1, c11, c13, m7, m8, n8, p8 internal connect s these inputs must be held at logic ?low?. pin description table (continued) name package coordinates description
MT90871 data sheet 8 zarlink semiconductor inc. 1.0 bidirectional and unidirectional applications the MT90871 has a maximum capacity of 8,192 input channels and 8,192 output channels. this is calculated from the maximum number of streams and channels: 32 input streams (16 backplane, 16 local) at 16.384mb/s and 32 output streams (16 backplane, 16 local) at 16.384mb/s. one typical mode of operation is to separate the backplane and local sides, as shown in figure 3 below. figure 3 - 4,096 x 4,096 channels (16mb/s), bidirectional switching in this system setup, the chip has a capacity of 4,096 input channels and 4,096 output channels on the backplane side as well as 4,096 input channels and 4,096 output channels on the local side. note that some or all of the output channels on one side can come from the other side, i.e. backplane input to local output switching. often a system design does not need to differentiate between backplane and local side, and merely needs maximum switching capacity. in this case, the MT90871 can be used as shown in figure 4 to give the full 8,192 x 8,192 channel capacity. figure 4 - 8,192 x 8,192 channels (16mb/s), unidirectional switching in this system, the backplane and local inputs and outputs are combined and the switch appears as a 32 stream input by 32 stream output switch. this style of operation is similar to older switch designs, such as the mt90826. 1.1 flexible configuration the f8kdx can be configured as a 4k by 4k non-blocking bi-directional digital switch, an 8k by 8k unidirectional non-blocking switch, and as a blocking switch with various switching capacities. 1.1.1 a. blocking bi-directional configuration (typical system configuration) ? 4,096-channel x 4,096-channel non-blocking switching from backplane to local streams ? 4,096-channel x 4,096-channel non-blocking switching from local to backplane streams ? 4,096-channel x 4,096-channel non-blocking switching from backplane input to backplane output streams ? 4,096-channel x 4,096-channel non-blocking switching from local input to local output streams MT90871 16 streams 16 streams 16 streams 16 streams bsti0-15 bsto0-15 lsto0-15 lsti0-15 backplane local MT90871 16 streams 16 streams 16 streams 16 streams bsti0-15 lsti0-15 bsto0-15 lsto0-15 input output
data sheet MT90871 9 zarlink semiconductor inc. 1.1.2 unidirectional configuration because the input and output drivers are synchronous, the user can combine input backplane streams and input local streams or output backplane streams and output local streams to increase the total number of input and output streams of the switch in a unidirectional configuration. ? 8,192-channel x 8,192-channel non-blocking switching from input to output streams 1.1.3 blocking configuration the f8kdx can be configured as a blocking switch if it is an application requirement. for example, it can be configured as a 6k by 2k blocking switch. ? 6,144-channel x 2,048-channel blocking switching from ?backplane? to ?local? streams ? 2,048-channel x 6,144-channel blocking switching from ?local? to ?backplane? streams ? 6,144-channel x 6,144-channel non-blocking switching from ?backplane? input to ?backplane? output streams ? 2,048-channel x 2,048-channel non-blocking switching from ?local? input to ?local? output streams figure 5 - 6k by 2k blocking configuration 2.0 functional description 2.1 switching configuration the device supports five switching configurations. (1) backplane-to-local, (2) local-to-backplane, (3) backplane- to-backplane, (4) local-to-local, and (5) uni-directional switch. the following sections describe the switching paths in detail. configurations (1) - (4) enable a non-blocking switch with a maximum capacity of 4,096 input channels and 4,096 output channels at backplane and local stream data-rates of 16.384mb/s. the switch paths of configurations (1) to (4) may be operated simultaneously. configuration (5) provides a uni-directional switch with a maximum capacity of 8,192 x 8,192 channels at 16.384mb/s data rate. 2.1.1 backplane-to-local path the device can provide data switching between the backplane input ports and the local output ports. the local connection memory determines the switching configurations. 2.1.2 local-to-backplane path the device can provide data switching between the local input ports and the backplane output ports. the backplane connection memory determines the switching configurations. 2.1.3 backplane-to-backplane path the device can provide data switching between the backplane input and output ports. the backplane connection memory determines the switching configurations. MT90871 bsti0-15 lsti0-7 bsto0-15 lsto0-7 6k by 2k 2k by 6k 2k by 2k lsti8-15 lsto8-15 6k x 6k total 24 input streams and total 8 input streams and 24 output streams. 8 output streams.
MT90871 data sheet 10 zarlink semiconductor inc. 2.1.4 local-to-local path the device can provide data switching between the local input and output ports. the local connection memory determines the switching configurations. 2.1.5 uni-directional switch the device may be optionally configured to provide an 8,192 x 8,192 uni-directional switch by grouping together all input and all output streams. all streams (lsti/lsto0-15 and bsti/bsto0-15) may be operated at a data-rate of 16.384mb/s. lower data-rates may be employed with a corresponding reduction in switch capacity. 2.2 port data rate modes and selection the selection of individual stream data-rates is summarized in table 1. 2.2.1 local port rate selection the local port has 16 input (lsti0-15) and 16 output (lsto0-15) data streams. all input and output streams may be individually selected for operation at a data rate of either 2.048mb/s, 4.096mb/s, 8.192mb/s or 16.384mb/s. the timing of the input and output clocks and frame pulses are shown in figure 6, local port timing diagram for 2,4,8 and 16mb/s stream rates. 2.2.1.1 local input port the bit rate for each input stream is selected by writing to a dedicated local input bit rate register (librr0- 15). refer to table 38, local input bit rate register (librrn) bits. stream number rate selection capability (for each individual stream) input stream - local 0-15 (lsti0-15) 2.048, 4.096, 8.192 or 16.384mb/s output stream - local 0-15 (lsto0-15) 2.048, 4.096, 8.192 or 16.384mb/s input stream - backplane 0-15 (bsti0-15) 2.048, 4.096, 8.192 or 16.384mb/s output stream - backplane 0-15 (bsto0-15) 2.048, 4.096, 8.192 or 16.384mb/s table 1- per-stream data-rate selection: backplane and local streams
data sheet MT90871 11 zarlink semiconductor inc. figure 6 - local port timing diagram for 2,4,8 and 16mb/s stream rates 2.2.1.2 local output port the bit rate for each output stream is selected by writing to a dedicated local output bit rate register (lobrr0-15). refer to table 40, local output bit rate register (lobrrn) bits. operation of stream data in the connection mode or the message mode is determined by the state of the lmm bit, and the channel high-impedance state is controlled by the le bit of the local connection memory. the data source (i.e. from the local or backplane data memory) is determined by the lsrc bit of the local connection memory. refer to section 6.1 and section 12.3. 2.2.2 backplane port rate selection the backplane port has 16 input (bsti0-15) and 16 output (bsto0-15) data streams. all input and output streams may be individually selected for operation at a data rate of either 2.048mb/s, 4.096mb/s, 8.192mb/s or 16.384mb/s. the timing of the input and output clocks and frame pulses are shown in figure 7, backplane port timing diagram for 2, 4, 8, and 16mb/s stream rates. 2.2.3 backplane input port the bit rate for each input stream is selected by writing to a dedicated backplane input bit rate register (bobrr0-15). refer to table 42, backplane input bit rate register (bibrrn) bits. fp8i (st-bus) (8.192mhz) c8i (gci) (8khz) (8khz) fp8i (gci) (8.192mhz) c8i (st-bus) 7 2 3 4 5 610 0 lsti/lsto0-15 (16mb/s) st 1 2 3 4 5 610 7 channel 255 channel 0 0 lsti/lsto0-15 (8mb/s) gci channel 0 3 7 6 channel 127 5 4 7 lsti/lsto0-15 (4mb/s) st channel 0 6 0 1 channel 63 7 12 7 0 0 0 lsti/lsto0-15 (2mb/s) gci channel 0 7 channel 31 0 7 0 5 4 3 2 167 7 lsti/lsto0-15 (16mb/s) gci 6 5 4 3 2 167 0 channel 255 channel 0 7 lsti/lsto0-15 (8mb/s) st channel 0 4 0 1 channel 127 2 3 65 0 7 0 lsti/lsto0-15 (4mb/s) gci channel 0 1 7 6 channel 63 0 7 7 lsti/lsto0-15 (2mb/s) st channel 0 0 channel 31 7 0
MT90871 data sheet 12 zarlink semiconductor inc. 2.2.3.1 backplane output port the bit rate for each output stream is selected by writing to a dedicated backplane output bit rate register (bobrr0-15). refer to table 44, backplane output bit rate register (bobrrn) bits. operation of stream data in the connection mode or the message mode is determined by the state of the bmm bit, and the channel high-impedance state is controlled by the be bit of the backplane connection memory. the data source (i.e. from the local or backplane data memory) is determined by the bsrc bit of the backplane connection memory. refer to section 6.2 "backplane connection memory" and section 12.4 "backplane connection memory bit definition". figure 7 - backplane port timing diagram for 2, 4, 8, and 16mb/s stream rates 2.3 backplane frame pulse input and master input clock timing the backplane frame pulse (fp8i ) is an 8khz input signal active for 122ns or 244ns at the frame boundary. the fpw bit in the control register must be set according to the applied pulse width. see pin description and table 13, control register bits , for details. the active state and timing of fp8i may conform either to the st-bus or to the gci-bus as shown in figure 6, local port timing diagram for 2,4,8 and 16mb/s stream rates, and figure 7, backplane port timing diagram for 2, 4, 8, and 16mb/s stream rates. the MT90871 will automatically detect whether an st-bus or a gci-bus style frame pulse is being used for the master frame pulse (fp8i ). the active edge of the input clock (c8i) shall be selected by the state of the control register bit c8ipol. for the purposes of describing the device fp8i (st-bus) (8.192mhz) 7 2 3 4 5 610 0 bsti/bsto0-15 (16mb/s) st 1 2 3 4 5 610 7 channel 255 channel 0 c8i (gci) 0 bsti/bsto0-15 (8mb/s) gci channel 0 3 7 6 channel 127 5 4 (8khz) (8khz) fp8i (gci) 7 bsti/bsto0-15 (4mb/s) st channel 0 6 0 1 channel 63 7 12 7 0 0 (8.192mhz) c8i (st-bus) 0 bsti/bsto0-15 (2mb/s) gci channel 0 7 channel 31 0 7 0 5 4 3 2 167 7 bsti/bsto0-15 (16mb/s) gci 6 5 4 3 2 167 0 channel 255 channel 0 7 bsti/bsto0-15 (8mb/s) st channel 0 4 0 1 channel 127 2 3 65 0 7 0 bsti/bsto0-15 (4mb/s) gci channel 0 1 7 6 channel 63 0 7 7 bsti/bsto0-15 (2mb/s) st channel 0 0 channel 31 7 0
data sheet MT90871 13 zarlink semiconductor inc. operation, the remaining part of this document assumes the st-bus style frame pulse with a single width frame pulse of 122ns and a falling active clock-edge, unless explicitly stated otherwise. in addition, the device provides fp8o , fp16o , c8o and c16o outputs to support external devices which connect to the local port. the local frame pulses (fp8o , fp16o ) will be provided in the same style as the master frame pulse (fp8i ). the polarity of c8o and c16o , at the frame boundary, can be controlled by the control register bit, copol. an analog phase lock loop (apll) is used to multiply the external clock frequency to generate an internal clock signal operated at 131.072mhz. 2.4 backplane frame pulse input and local frame pulse output alignment the MT90871 accepts a backplane frame pulse (fp8i ) and generates the local frame pulse outputs, fp8o and fp16o , which are aligned to the master frame pulse. there is a constant three frame delay for data being switched. for further details of frame pulse conditions and options see section 13.1 "control register (cr)", figure 17, frame boundary conditions, st- bus operation, and figure 18, frame boundary conditions, gci - bus operation. figure 8 - backplane and local frame pulse alignment for data rates of 2mb/s, 4mb/s, 8mb/s and 16mb/s ch3 ch7 ch0 ch1 ch2 bsti/bsto0-15 (16mb/s) c8o fp8o lsti/lsto0-15 (2mb/s) lsti/lsto0-15 (4mb/s) lsti/lsto0-15 (8mb/s) lsti/lsto0-15 (16mb/s) ch2 ch1 ch0 ch6 ch5 ch4 ch3 ch2 ch0 ch4 ch5 ch10 ch9 ch8 ch11 ch 15 ch 14 ch 13 ch 12 ch 11 ch 10 ch 9 ch 8 ch 7 ch 6 ch 5 ch 4 ch 3 ch 2 ch 1 ch 0 ch 19 ch 18 ch 17 ch 16 ch 23 ch 22 ch 21 ch 20 ch1 ch 3 ch 2 ch 1 ch 0 ch 7 ch 6 ch 5 ch 4 ch 11 ch 10 ch 9 ch 8 ch 15 ch 14 ch ch 12 13 ch 17 ch 16 ch 21 ch 20 ch ch 18 19 ch 23 ch 22 fp8i c8i ch3 ch7 ch0 ch1 ch2 (2mb/s) bsti/bsto0-15 (4mb/s) bsti/bsto0-15 ch2 ch1 ch0 ch6 ch5 ch4 ch3 ch2 ch0 ch4 ch5 ch10 ch9 ch8 ch11 ch1 bsti/bsto0-15 (8mb/s)
MT90871 data sheet 14 zarlink semiconductor inc. 3.0 input and output offset programming 3.1 input channel delay programming (backplane and local input streams) various registers are used to control the input sampling point (delay) and the output advancement for the local and backplane streams. the following sections explain the details of these offset programming features. the control of the input channel delay and the input bit delay allows each input stream to have a different frame boundary with respect to the master frame pulse, fp8i . by default, all input streams have channel delay of zero such that ch0 is the first channel that appears after the frame boundary. by programming the backplane or local input channel delay registers, bcdr0-15 and lcdr0-15, users can assign the ch0 position to be located at any one of the channel boundaries in a frame. for delays within channel boundaries, the input bit delay programming can be used. the use of input channel delay in combination with input bit delay enables the ch0 position to be placed anywhere within a frame to a resolution of 1/4 of the bit period. figure 9 - backplane and local input channel delay timing diagram (8mb/s) 3.2 input bit delay programming (backplane and local input streams) in addition to the input channel delay programming, the input bit delay programming feature provides users with greater flexibility when designing switch matrices for high speed operation. the input bit delay may be programmed on a per-stream basis to accommodate delays created on pcm highways. for all streams the delay is up to 7 3/4 bits with a resolution of 1/4 bit, for the selected data-rate. see figure 10 and figure 11 for input bit delay timing at 16mb/s and 8mb/s data rates, respectively. the local input delay is defined by the local input delay registers, lidr0 to lidr15, corresponding to the local data streams, lsti0 to lsti15, and the backplane input delay is defined by the backplane input delay registers, bidr0 to bidr15, which correspond to the backplane data streams, bsti0 to bsti15. fp8o c8o 72 3 4 5 610 bsti0-15/lsti0-15 channel delay = 0 ch 0 72 3 4 5 610 ch 1 2 310 72 3 4 5 610 ch127 2 3 4 5 610 ch126 76 72 3 4 5 610 bsti0-15/lsti0-15 channel delay = 1 ch127 72 3 4 5 610 ch 0 2 310 72 3 4 5 610 ch126 2 3 4 5 610 ch125 76 72 3 4 5 610 bsti0-15/lsti0-15 channel delay = 2 ch126 72 3 4 5 610 ch127 2 310 72 3 4 5 610 ch125 2 3 4 5 610 ch0 76 (default) channel delay,1 channel delay, 2 7
data sheet MT90871 15 zarlink semiconductor inc. figure 10 - backplane and local input bit delay timing diagram for data rate of 16mb/s c8o 72 3 4 5 610 bsti0-15/lsti0-15 bit delay = 0 ch0 74 5 6 ch1 2 310 bsti0-15/lsti0-15 bit delay = 1/4 72 3 4 5 610 bsti0-15/lsti0-15 bit delay = 1 ch0 75 6 ch1 2 310 (default) 72 3 4 5 610 ch0 74 5 6 ch1 2 310 ch255 ch255 ch255 bit delay, 1/4 bit delay, 1 bsti0-15/lsti0-15 bit delay = 1/2 72 3 4 5 610 ch0 74 5 6 ch1 2 310 ch255 bit delay, 1/2 bsti0-15/lsti0-15 bit delay = 3/4 72 3 4 5 610 ch0 74 5 6 ch1 2 310 ch255 bit delay, 3/4 bsti0-15/lsti0-15 bit delay = 7 1/2 72 3 4 5 610 ch255 74 5 6 ch0 210 ch254 bit delay, 7 1/2 bsti0-15/lsti0-15 bit delay = 7 3/4 72 3 4 5 610 ch255 74 5 6 ch0 210 ch254 bit delay, 7 3/4 fp8o
MT90871 data sheet 16 zarlink semiconductor inc. figure 11 - backplane and local input bit delay timing diagram for data rate of 8mb/s 3.3 output advancement programming (backplane and local output streams) this feature is used to advance the output channel alignment of individual local or backplane output streams with respect to the frame boundary. each output stream has its own advancement value which can be programmed by the output advancement registers. the output advancement selection is useful in compensating for various parasitic loading on the serial data output pins. 3.3.1 local output advancement programming the local output advancement registers, loar0-15 , are used to control the local output advancement. the advancement is determined with reference to the internal system clock rate (131.072mhz). for 2mb/s, 4mb/s, 8mb/s or 16mb/s streams the advancement may be 0, -2 cycles, -4 cycles or -6 cycles, which converts to approximately 0ns, -15ns, -30ns or -45ns as shown in figure 12. 3.3.2 backplane output advancement programming the backplane output advancement registers, boar0-15 are used to control the backplane output advancement. the advancement is determined with reference to the internal system clock rate (131.072mhz). for 2mb/s, 4mb/s, 8mb/s or 16mb/s streams the advancement may be 0, -2 cycles, -4 cycles or -6 cycles, which converts to approximately 0ns, -15ns, -30ns or -45ns as shown in figure 12. c8o 72 3 4 5 610 bsti0-15/lsti0-15 bit delay = 0 ch0 74 5 6 ch1 2 310 bsti0-15/lsti0-15 bit delay = 1/4 72 3 4 5 610 bsti0-15/lsti0-15 bit delay = 1 ch0 75 6 ch1 2 310 (default) 72 3 4 5 610 ch0 74 5 6 ch1 2 310 ch127 ch127 ch127 bit delay, 1/4 bit delay, 1 bsti0-15/lsti0-15 bit delay = 1/2 72 3 4 5 610 ch0 74 5 6 ch1 2 310 ch127 bit delay, 1/2 bsti0-15/lsti0-15 bit delay = 3/4 72 3 4 5 610 ch0 74 5 6 ch1 2 310 ch127 bit delay, 3/4 bsti0-15/lsti0-15 bit delay = 7 1/2 72 3 4 5 610 ch127 74 5 6 ch0 210 ch126 bit delay, 7 1/2 bsti0-15/lsti0-15 bit delay = 7 3/4 72 3 4 5 610 ch127 74 5 6 ch0 210 ch126 bit delay, 7 3/4 fp8o
data sheet MT90871 17 zarlink semiconductor inc. figure 12 - backplane and local output advancement timing diagram for data rate of 16mb/s 4.0 port high impedance control 4.1 local port high impedance control the input pin lors selects whether the local output streams lsto0-15 are set to high impedance at the output of the MT90871 itself or are always driven (active high or active low) and a high impedance state, if required on a per-channel basis, is invoked through an external interface circuit controlled by the lcsto0-1 signals. setting lors to a low state will configure the output streams lsto0-15 to transmit bi-state channel data with per-channel high-impedance determined by external circuits under the control of the lcsto0-1 outputs. setting lors to a high state will configure the output streams lsto0-15 of the MT90871 to invoke a high-impedance output on a per-channel basis. the lors pin is an asynchronous input and is expected to be hard-wired for a particular system application, although it may be driven under logic control if preferred. 4.1.1 lors set low the data (channel control bit) transmitted by lcsto0-1 replicates the local output enable bit ( le ) of the local connection memory, with a low state indicating that the channel should be set to high impedance by external drivers. refer to section 12.3 "local connection memory bit definition". the lcsto0-1 outputs transmit serial data (channel control bits) at 16.384mb/s, with each bit representing the per-channel high impedance state for specific streams. eight output streams are allocated to each control line as follows: ? lcsto0 outputs the channel control bits for streams lsto0, 2, 4, 6, 8, 10, 12 and 14. ? lcsto1 outputs the channel control bits for streams lsto1, 3, 5, 7, 9, 11, 13 and 15. (see also ? pin description ?.) the channel control bit location, within a frame period, for each channel of the local output streams is presented in table 2 "lcsto allocation of channel control bits to the output streams" . as an aid to the description, the channel control bit for a single channel on specific streams is presented, with reference to table 2. 1. the channel control bit corresponding to stream 0, channel 0, lsto0_ch0, is transmitted on lcsto0 and is advanced, relative to the frame boundary, by 10 periods of c16o . bit advancement, -2 bit advancement, -4 bit advancement, -6 fp8o system clock bsto0-1 5/lsto0-15 bit advancement = 0 bsto0-1 5/lsto0-15 bit advancement = -2 (default) bit advancement = -6 bsto0-1 5/lsto0-15 bit advancement = -4 bsto0-1 5/lsto0-15 131.072 mhz ch255 ch255 ch255 ch255 ch0 ch0 ch0 ch0 bit 1 bit 0 bit 7 bit 6 bit 5 bit 1 bit 0 bit 7 bit 6 bit 5 bit 1 bit 0 bit 7 bit 6 bit 5 bit 1 bit 0 bit 7 bit 6 bit 5 bit 4 bit 4
MT90871 data sheet 18 zarlink semiconductor inc. 2. the channel control bit corresponding to stream 14, channel 0, lsto14_ch0, is transmitted on lcsto0 in advance of the frame boundary by three periods of output clock, c16o . similarly, the channel control bit for lsto15_ch0 is advanced relative to the frame boundary by three periods of c16o , on lcsto1 . the lcsto0-1 outputs data at a constant data-rate of 16.384mb/s, independent of the data-rate selected for the individual output streams, lsto0-15 . streams at data-rates lower than 16.384mb/s will have the value of the respective channel control bit repeated for the duration of the channel. the bit will be transmitted twice for 8.192mb/s streams, four times for 4.096mb/s streams and eight times for 2.048mb/s streams. the channel control bit is not repeated for 16.384mb/s streams. examples are presented, with reference to table 2: 3. with stream lsto2 selected to operate at a data-rate of 2.048mb/s, the value of the channel control bit for channel 0 will be transmitted during the c16o clock period nos. 2040, 2048, 8, 16, 24, 32, 40 and 48. 4. with stream lsto4 operated at a data-rate of 8.192mb/s, the value of the channel control bit for channel 1 will be transmitted during the c16o clock period nos. 9 and 17. figure 13, local port external high impedance control bit timing (st-bus mode) shows the channel control bits for lcsto0 and lcsto1 in one possible scenario which includes stream lsto0 at a data-rate of 16.384mb/s, lsto1 at 8.192mb/s, lsto6 at 4.096mb/s and lsto7 at 2.048mb/s. all remaining streams are operated at a data-rate of 16.384mb/s. 4.1.2 lors set high the local output enable bit ( le ) of the local connection memory has direct per-channel control on the high- impedance state of the local output streams, lsto0-15 . programming a low state will set the stream output of the MT90871 to high impedance for the duration of the channel period. see section 12.3 "local connection memory bit definition", for programming details. the lcsto0-1 outputs remain active. allocated stream no. allocated channel no. 2 c16o period 1 lcsto0 lcsto1 16mb/s 8mb/s 4mb/s 2mb/s 2039 0 3-1 1 ch 0 ch 0 ch 0 ch 0 2040 2 3-3 3 ch 0 ch 0 ch 0 ch 0 2041 4 5 ch 0 ch 0 ch 0 ch 0 2042 6 7 ch 0 ch 0 ch 0 ch 0 2043 8 9 ch 0 ch 0 ch 0 ch 0 2044 10 11 ch 0 ch 0 ch 0 ch 0 2045 12 13 ch 0 ch 0 ch 0 ch 0 2046 14 3-2 15 3-2 ch 0 ch 0 ch 0 ch 0 2047 0 1 ch 1 ch 0 ch 0 ch 0 2048 2 3-3 3 ch 1 ch 0 ch 0 ch 0 frame 1 4 5 ch 1 ch 0 ch 0 ch 0 boundary 2 6 7 ch 1 ch 0 ch 0 ch 0 3 8 9 ch 1 ch 0 ch 0 ch 0 4 10 11 ch 1 ch 0 ch 0 ch 0 table 2- lcsto allocation of channel control bits to the output streams
data sheet MT90871 19 zarlink semiconductor inc. 5 12 13 ch 1 ch 0 ch 0 ch 0 6 14 15 ch 1 ch 0 ch 0 ch 0 7 0 1 ch 2 ch 1 ch 0 ch 0 8 2 3-3 3 ch 2 ch 1 ch 0 ch 0 9 4 3-4 5 ch 2 ch 1 ch 0 ch 0 10 6 7 ch 2 ch 1 ch 0 ch 0 11 8 9 ch 2 ch 1 ch 0 ch 0 12 10 11 ch 2 ch 1 ch 0 ch 0 13 12 13 ch 2 ch 1 ch 0 ch 0 14 14 15 ch 2 ch 1 ch 0 ch 0 15 0 1 ch 3 ch 1 ch 0 ch 0 16 2 3-3 3 ch 3 ch 1 ch 0 ch 0 17 4 3-4 5 ch 3 ch 1 ch 0 ch 0 etc. etc. etc. etc. etc. etc. etc. etc. etc. etc. etc. etc. etc. etc. 2029 etc. etc. ch 254 ch 127 ch 63 ch 31 2030 14 15 ch 254 ch 127 ch 63 ch 31 2031 0 1 ch 255 ch 127 ch 63 ch 31 2032 2 3 ch 255 ch 127 ch 63 ch 31 2033 4 5 ch 255 ch 127 ch 63 ch 31 2034 6 7 ch 255 ch 127 ch 63 ch 31 2035 8 9 ch 255 ch 127 ch 63 ch 31 2036 10 11 ch 255 ch 127 ch 63 ch 31 2037 12 13 ch 255 ch 127 ch 63 ch 31 2038 14 15 ch 255 ch 127 ch 63 ch 31 2039 0 1 ch 0 ch 0 ch 0 ch 0 2040 2 3 ch 0 ch 0 ch 0 ch 0 2041 4 5 ch 0 ch 0 ch 0 ch 0 2042 6 7 ch 0 ch 0 ch 0 ch 0 2043 8 9 ch 0 ch 0 ch 0 ch 0 2044 10 11 ch 0 ch 0 ch 0 ch 0 2045 12 13 ch 0 ch 0 ch 0 ch 0 2046 14 15 ch 0 ch 0 ch 0 ch 0 2047 0 1 ch 1 ch 0 ch 0 ch 0 allocated stream no. allocated channel no. 2 c16o period 1 lcsto0 lcsto1 16mb/s 8mb/s 4mb/s 2mb/s table 2- lcsto allocation of channel control bits to the output streams (continued)
MT90871 data sheet 20 zarlink semiconductor inc. note 1: clock period count is referenced to frame boundary. note 2: the channel numbers presented relate to the data-rate selected for a specific stream. note 3-1 to 3-4: see section 4.1.1 for examples of channel control bit for streams of different data-rates. figure 13 - local port external high impedance control bit timing (st-bus mode) 4.2 backplane high impedance control the input pin bors selects whether the backplane output streams bsto0-15 are set to high impedance at the output of the MT90871 itself, or are always driven (active high or active low) and a high impedance state, if required on a per-channel basis, is invoked through an external interface circuit controlled by the bcsto0-1 signals. setting bors to a low state will configure the output streams bsto0-15 to transmit bi-state channel data with per-channel high-impedance determined by external circuits under the control of the bcsto0-1 2048 2 3 ch 1 ch 0 ch 0 ch 0 frame 1 4 5 ch1 ch0 ch0 ch0 boundary 2 6 7 ch 1 ch 0 ch 0 ch 0 3 8 9 ch 1 ch 0 ch 0 ch 0 etc. etc. etc. etc. etc. etc. etc. allocated stream no. allocated channel no. 2 c16o period 1 lcsto0 lcsto1 16mb/s 8mb/s 4mb/s 2mb/s table 2- lcsto allocation of channel control bits to the output streams (continued) chan 0 bit 7 chan 0 bit 6 chan 63 bit 1 chan 63 bit 0 chan 0 bit 7 chan 63 bit 0 7 6 5 4 3 2 3 2 1 0 5 4 1 6 0 7 7 6 0 chan 0 bit 7 chan 0 bit 6 chan 0 bit 5 chan 0 bit 4 chan 127 bit 3 chan 127 bit 2 chan 127 bit 1 chan 127 bit 0 chan 0 bit 7 chan 127 bit 0 channel 0 bit 7 channel 31 bit 0 chan 0 bit 7 chan 31 bit 0 lcsto0 lsto0 (16mb/s) lsto1 (8mb/s) lsto6 (4mb/s) lsto7 (2mb/s) c8o fp8o ch 1 lsto0 ch 1 lsto2 ch 1 lsto4 ch 0 lsto6 ch 1 lsto8 ch 1 lsto10 ch 1 lsto12 ch 1 lsto14 ch 2 lsto0 ch 2 lst02 ch 0 lsto4 ch 0 lsto6 ch 0 lsto8 ch 0 lsto10 ch 0 lsto12 ch 0 lsto14 ch 1 lsto0 ch 1 lsto2 ch 1 lsto4 ch 0 lsto6 ch 0 lsto1 ch 1 lsto3 ch 1 lsto5 ch 0 lsto7 ch 1 lsto9 ch 1 lsto11 ch 1 lsto13 ch 1 lsto15 ch 1 lsto1 ch 2 lsto3 ch 0 lsto5 ch 0 lsto7 ch 0 lsto9 ch 0 lsto11 ch 0 lsto13 ch 0 lsto15 ch 0 lsto1 ch 1 lsto3 ch 1 lsto5 ch 0 lsto7 lcsto1 one c16o period channel 0 channel 255 bits 7-0 1
data sheet MT90871 21 zarlink semiconductor inc. outputs. setting bors to a high state will configure the output streams bsto0-15 of the MT90871 to invoke a high-impedance output on a per-channel basis. the bors pin is an asynchronous input and is expected to be hard-wired for a particular system application, although it may be driven under logic control if preferred. 4.2.1 bors set low. the data (channel control bit) transmitted by bcsto0-1 replicates the backplane output enable bit ( be ) of the backplane connection memory, with a low state indicating that the channel should be set to high impedance by external drivers. refer to section 12.4 "backplane connection memory bit definition". the bcsto0-1 outputs transmit serial data (channel control bits) at 16.384mb/s, with each bit representing the per-channel high impedence state for specific streams. eight output streams are allocated to each control line as follows: ? bcsto0 outputs the channel control bits for streams bsto0, 2, 4, 6, 8, 10, 12 and 14. ? bcsto1 outputs the channel control bits for streams bsto1, 3, 5, 7, 9, 11, 13 and 15. (see also pin description ) the channel control bit location, within a frame period, for each channel of the backplane output streams is presented in table 3, bcsto allocation of channel control bits to the output streams. as an aid to the description, the channel control bit for a single channel on specific streams is presented, with reference to table 3: 1. the channel control bit corresponding to stream 0, channel 0, bsto0_ch0, is transmitted on bcsto0 and is advanced, relative to the frame boundary, by 10 periods of c16o , (i.e. clock period no. 2039). 2. the channel control bit corresponding to stream 14, channel 0, bsto14_ch0, is transmitted on bcsto0 in advance of the frame boundary by three periods of output clock, c16o , (i.e. clock period no. 2046). similarly, the channel control bit for bsto15_ch0 is advanced relative to the frame boundary by three periods of c16o , on bcsto1 . the bcsto0-1 outputs data at a constant data-rate of 16.384mb/s, independent of the data-rate selected for the individual output streams, bsto0-15 . streams at data-rates lower than 16.384mb/s will have the value of the respective channel control bit repeated for the duration of the channel. the bit will be transmitted twice for 8.192mb/s streams, four times for 4.096mb/s streams and eight times for 2.048mb/s streams. the channel control bit is not repeated for 16.384mb/s streams. examples are presented, with reference to table 3: 3. with stream bsto2 selected to operate at a data-rate of 2.048mb/s, the value of the channel control bit for channel 0 will be transmitted during the c16o clock period nos. 2040, 2048, 8, 16, 24, 32, 40 and 48. 4. with stream bsto4 operated at a data-rate of 8.192mb/s, the value of the channel control bit for channel 1 will be transmitted during the c16o clock period nos. 9 and 17.
MT90871 data sheet 22 zarlink semiconductor inc. allocated stream no. channel no. 2 c16o period 1 bcsto0 bcsto1 16mb/s 8mb/s 4mb/s 2mb/s 2039 0 3-1 1 ch 0 ch 0 ch 0 ch 0 2040 2 3-3 3 ch 0 ch 0 ch 0 ch 0 2041 4 5 ch 0 ch 0 ch 0 ch 0 2042 6 7 ch 0 ch 0 ch 0 ch 0 2043 8 9 ch 0 ch 0 ch 0 ch 0 2044 10 11 ch 0 ch 0 ch 0 ch 0 2045 12 13 ch 0 ch 0 ch 0 ch 0 2046 14 3-2 15 3-2 ch 0 ch 0 ch 0 ch 0 2047 0 1 ch 1 ch 0 ch 0 ch 0 2048 2 3 ch 1 ch 0 ch 0 ch 0 frame 1 4 5 ch 1 ch 0 ch 0 ch 0 boundary 2 6 7 ch 1 ch 0 ch 0 ch 0 3 8 9 ch 1 ch 0 ch 0 ch 0 4 10 11 ch 1 ch 0 ch 0 ch 0 5 12 13 ch 1 ch 0 ch 0 ch 0 6 14 15 ch 1 ch 0 ch 0 ch 0 7 0 1 ch 2 ch 1 ch 0 ch 0 82 3-3 3 ch 2 ch 1 ch 0 ch 0 94 3-4 5 ch 2 ch 1 ch 0 ch 0 10 6 7 ch 2 ch 1 ch 0 ch 0 11 8 9 ch 2 ch 1 ch 0 ch 0 12 10 11 ch 2 ch 1 ch 0 ch 0 13 12 13 ch 2 ch 1 ch 0 ch 0 14 14 15 ch 2 ch 1 ch 0 ch 0 15 0 1 ch 3 ch 1 ch 0 ch 0 16 2 3-3 3 ch 3 ch 1 ch 0 ch 0 17 4 3-4 5 ch 3 ch 1 ch 0 ch 0 etc. etc. etc. etc. etc. etc. etc. etc. etc. etc. etc. etc. etc. etc. 2029 etc. etc. ch 254 ch 127 ch 63 ch 31 2030 14 15 ch 254 ch 127 ch 63 ch 31 2031 0 1 ch 255 ch 127 ch 63 ch 31 2032 2 3 ch 255 ch 127 ch 63 ch 31 2033 4 5 ch 255 ch 127 ch 63 ch 31 2034 6 7 ch 255 ch 127 ch 63 ch 31 table 3- bcsto allocation of channel control bits to the output streams
data sheet MT90871 23 zarlink semiconductor inc. note 1: clock period count is referenced to frame boundary. note 2: the channel numbers presented relate to the data-rate selected for a specific stream. note 3-1 to 3-4: see section 4.2.1 for examples of channel control bit for streams of different data-rates. 2035 8 9 ch 255 ch 127 ch 63 ch 31 2036 10 11 ch 255 ch 127 ch 63 ch 31 2037 12 13 ch 255 ch 127 ch 63 ch 31 2038 14 15 ch 255 ch 127 ch 63 ch 31 2039 0 1 ch 0 ch 0 ch 0 ch 0 2040 2 3 ch 0 ch 0 ch 0 ch 0 2041 4 5 ch 0 ch 0 ch 0 ch 0 2042 6 7 ch 0 ch 0 ch 0 ch 0 2043 8 9 ch 0 ch 0 ch 0 ch 0 2044 10 11 ch 0 ch 0 ch 0 ch 0 2045 12 13 ch 0 ch 0 ch 0 ch 0 2046 14 15 ch 0 ch 0 ch 0 ch 0 2047 0 1 ch 1 ch 0 ch 0 ch 0 2048 2 3 ch1 ch 0 ch 0 ch 0 frame 1 4 5 ch 1 ch 0 ch 0 ch 0 boundary 2 6 7 ch 1 ch 0 ch 0 ch 0 3 8 7 ch 1 ch 0 ch 0 ch 0 etc. etc. etc. etc. etc. etc. etc. allocated stream no. channel no. 2 c16o period 1 bcsto0 bcsto1 16mb/s 8mb/s 4mb/s 2mb/s table 3- bcsto allocation of channel control bits to the output streams (continued)
MT90871 data sheet 24 zarlink semiconductor inc. figure 14 - backplane port external high impedance control bit timing. figure 14, backplane port external high impedance control bit timing. shows the channel control bits for bcsto0 and bcsto1 in one possible scenario which includes stream bsto0 at a data-rate of 16.384mb/s, bsto1 at 8.192mb/s, bsto6 at 4.096mb/s and bsto7 at 2.048mb/s. all remaining streams are operated at a data-rate of 16.384mb/s. 4.2.2 bors set high the backplane output enable bit ( be ) of the backplane connection memory has direct per-channel control on the high-impedance state of the backplane output streams, bsto0-15 . programming a low state will set the stream output of the MT90871 to high impedance for the duration of the channel period. see section 12.4 "backplane connection memory bit definition", for programming details. the bcsto0-1 outputs are held in a high-impedance state. 5.0 data delay through the switching paths for all data rates, the received serial data is converted to parallel format and stored sequentially in the data memory. each data memory location corresponds to an input stream and channel number. to provide constant delay and maintain frame integrity, the MT90871 utilizes four pages of data memory. consecutive frames are written in turn to each page of memory. reading is controlled to allow a channel data written in frame n to be read during frame n+3. a constant delay of three frames is applied to all switching paths irrespective of data-rate or channel number. see figure 15. chan 0 bit 7 chan 0 bit 6 chan 63 bit 1 chan 63 bit 0 chan 0 bit 7 chan 63 bit 0 7 6 5 4 3 2 3 2 1 0 5 4 1 6 0 7 7 6 0 chan 0 bit 7 chan 0 bit 6 chan 0 bit 5 chan 0 bit 4 chan 127 bit 3 chan 127 bit 2 chan 127 bit 1 chan 127 bit 0 chan 0 bit 7 chan 127 bit 0 channel 0 bit 7 channel 31 bit 0 chan 0 bit 7 chan 31 bit 0 bcsto0 bsto0 (16mb/s) bsto1 (8mb/s) bsto6 (4mb/s) bsto7 (2mb/s) c8o fp8o ch 1 bsto0 ch 1 bsto2 ch 1 bsto4 ch 0 bsto6 ch 1 bsto8 ch 1 bsto10 ch 1 bsto12 ch 1 bsto14 ch 2 bsto0 ch 2 bst02 ch 0 bsto4 ch 0 bsto6 ch 0 bsto8 ch 0 bsto10 ch 0 bsto12 ch 0 bsto14 ch 1 bsto0 ch 1 bsto2 ch 1 bsto4 ch 0 bsto6 ch 0 bsto1 ch 1 bsto3 ch 1 bsto5 ch 0 bsto7 ch 1 bsto9 ch 1 bsto11 ch 1 bsto13 ch 1 bsto15 ch 1 bsto1 ch 2 bsto3 ch 0 bsto5 ch 0 bsto7 ch 0 bsto9 ch 0 bsto11 ch 0 bsto13 ch 0 bsto15 ch 0 bsto1 ch 1 bsto3 ch 1 bsto5 ch 0 bsto7 bcsto1 one c16o period channel 0 channel 255 bits 7-0 1
data sheet MT90871 25 zarlink semiconductor inc. figure 15 - constant switch delay: examples of different stream rates and routing 6.0 connection memory description the MT90871 incorporates two connection memories, local connection memory and backplane connection memory. 6.1 local connection memory the local connection memory (lcm) is 16-bit wide with 4,096 memory locations to support the local output port. the most significant bit of each word, bit [15], selects the source stream from either the backplane or the local port and determines the backplane-to-local or local-to-local data routing. bits [14:13] select the control modes of the local output streams, namely the per-channel message and the per-channel high impedance output control modes. in connection mode (bit14 = low), bits [12:0] select the source stream and channel number as detailed in table 4 . in message mode (bit14 = high), bits [12:8] are unused and bits [7:0] contain the message byte to be transmitted. ch 254 ch 0 ch 1 ch 254 ch 255 ch 254 ch 255 ch 0 ch 1 ch 0 ch 1 ch 255 bsti0 (16mb/s) fp8o ch 254 ch 0 ch 1 ch 254 ch 255 ch 254 ch 255 ch 0 ch 1 ch 0 ch 1 ch 255 bsto1 (16mb/s) frame n frame n+3 frame n+4 ch 0 ch 127 ch 127 ch 0 ch 0 ch 127 bsti0 (8mb/s) ch 0 ch 127 ch 127 ch 0 ch 0 ch 127 lsto1 (8mb/s) ch 0 ch 127 ch 127 ch 0 ch 0 ch 127 lsti0 (8mb/s) ch 0 ch 63 ch 63 ch 0 ch 0 ch 63 bsto1 (4mb/s) ch 0 ch 127 ch 127 ch 0 ch 0 ch 127 lsti0 (8mb/s) ch 0 ch 31 ch 31 ch 0 ch 0 ch 31 lsto1 (2mb/s) example showing local to local switching example showing local to backplane switching example showing backplane to local switching example showing backplane to backplane switching frames n+1 and n+2
MT90871 data sheet 26 zarlink semiconductor inc. the control register bits ms2, ms1, and ms0 must be set to 000, respectively, to select the local connection memory for the write and read operations via the microprocessor port. see section 7.0 "microprocessor port", and section 13.1 "control register (cr)" for details on microprocessor port access. 6.2 backplane connection memory the backplane connection memory (bcm) is 16-bit wide with 4,096 memory locations to support the backplane output port. the most significant bit of each word, bit [15], selects the source stream from either the backplane or the local port and determines the local-to-backplane or backplane-to-backplane data routing. bits [14:13] select the control modes of the backplane output streams, namely the per-channel message mode and the per-channel high impedance output control mode. in connection mode (bit14 = low), bits [12:0] select the source stream and channel number as detailed in table 4. in message mode (bit14 = high), bits [12:8] are unused and bits [7:0] contain the message byte to be transmitted. the control register bits ms2, ms1, and ms0 must be set to 001, respectively, to select the backplane connection memory for the write and read operations via the microprocessor port. see section 7.0, and section 13.1 . 6.3 connection memory block programming this feature allows fast simultaneous initialization of the local and backplane connection memories after power up. when the memory block programming mode is enabled, the contents of the block programming register (bpr) will be loaded into the connection memories. see table 13 and table 14 for details of the control register and block programming register values, respectively. 6.3.1 memory block programming procedure ? set the mbp bit in the control register from low to high. ?set the bpe bit to high in the block programming register (bpr). the local block programming data bits, lbpd2-0 , of the block programming register, will be loaded into bit 15, bit 14 and bit 13, respectively, of the local connection memory. the remaining bit positions are loaded with zeros as shown in table 5. table 5- local connection memory in block programming mode the backplane block programming data bits, bbpd2-0 , of the block programming register, will be loaded into bit 15, bit 14 and bit 13, respectively, of the backplane connection memory. the remaining bit positions are loaded with zeros as shown in table 6. source stream bit rate source stream no. source channel no. 2mb/s [12:8] legal values 0 - 15 [7:0] legal values 0 - 31 4mb/s [12:8] legal values 0 - 15 [7:0] legal values 0 - 63 8mb/s [12:8] legal values 0 - 15 [7:0] legal values 0 - 127 16mb/s [12:8] legal values 0 - 15 [7:0] legal values 0 - 255 table 4- local and backplane connection memory configuration 15 14 13 1211109876543210 lbpd2 lbpd1lbpd00000000000000
data sheet MT90871 27 zarlink semiconductor inc. table 6- backplane connection memory in block programming mode the block programming register bit, bpe will be automatically reset low within 125us, to indicate completion of memory programming. the block programming mode can be terminated at any time prior to completion by setting the bpe bit of the block programming register or the mbp bit of the control register to low. note the default values (low) of lbpd2-0 and bbpd2-0 of the block programming register, following a device reset, may be used. these settings shall set all output channels to high, or high-impedance, in accordance with the lors and bors pin conditions, see pin description for further details. the local connection memory shall be configured to select data from channel 0 of backplane input stream 0 ( bsti0 ), and the backplane connection memory shall be configured to select data from channel 0 of local input stream 0 ( lsti0 ). alternative conditions may be established by programming bits lbpd2-0 and bbpd2-0 of the block programming register at the time of setting bit bpe to high. see section 12.3 "local connection memory bit definition", section 12.4 "backplane connection memory bit definition", and section 13.2 "block programming register (bpr)". 7.0 microprocessor port the MT90871 supports non-multiplexed motorola microprocessors. the microprocessor port consists of 16-bit parallel data bus ( d0-15 ), 15-bit address bus ( a0-14 ) and four control signals ( cs , ds , r/w and dta ). the data bus provides access to the internal registers, the backplane connection and data memories, and the local connection and data memories. each memory has 4,096 locations. see table 7, address map for data and connection memory locations (a14=1), for the address mapping. each connection memory can be read or written via the 16-bit microprocessor port. the data memories can only be read (but not written) from the microprocessor port. to prevent the bus ?hanging?, in the event of the MT90871 not receiving a master clock, the microprocessor port shall complete the dta handshake when accessed but any data read from the bus will be invalid. there must be a minimum of 30ns between cpu accesses, to allow the mt90869 device to recognize the accesses as separate (i.e. a minimum of 30ns must separate the de-assertion of dta_b (to high) and the assertion of cs_b and/or ds_6 to initiate the next access). 8.0 device power-up, initialization and reset 8.1 power-up sequence the recommended power-up sequence is for the vdd_io supply (nominally +3.3v) to be established before the power-up of the vdd_pll and vdd_core supplies (nominally +1.8v). the vdd_pll and vdd_core supplies may be powered up simultaneously, but neither should 'lead' the vdd_io supply by more t han 0.3v. all supplies may be powered-down simultaneously. 8.2 initialization upon power up, the MT90871 should be initialized by applying the following sequence: 1. ensure the trst pin is permenantly low to disable the jtag tap controller. 2. set ode pin to low. this configures the lcsto0-1 output signals to low (i.e. to set optional external output buffers to high impedance), and sets the lsto0-15 outputs to high or high impedance, dependent on the lors input value, and sets the bcsto0-1 output signals to low (i.e. to set optional external output buffers to high impedance), and sets the bsto0-15 outputs to high or high impedance, dependent on bors input value. refer to pin description for details of the lors and bors pins. 3. reset the device by pulsing the reset pin to zero for at least two cycles of the input clock, c8i . 15 14 13 1211109876543210 bbpd2 bbpd1 bbpd0 0 0 0 0 0 0 0 0 0 0 0 0 0
MT90871 data sheet 28 zarlink semiconductor inc. 4. use the block programming mode to initialize the local and the backplane connection memories. refer to 6.3 "connection memory block programming". 5. set ode pin to high after the connection memories are programmed to ensure that bus contention will not occur at the serial stream outputs. 8.3 reset the reset pin is used to reset the device. when set low, an asynchronous reset is applied to the MT90871. it is synchronized to the internal clock and remains active for 50 us following release (set high) of the external reset to allow time for the pll to fully settle. during the reset period, depending on the state of input pins lors and bors , the output streams lsto0- 15 and bsto0-15 are set to high or high impedance, and all internal registers and counters are reset to the default state. the reset pin must remain low for two input clock cycles ( c8i ) to guarantee a synchronized reset release. when reset is applied to the MT90871, the cs line is inhibited and the dta line may become active through simultaneous microport activity. external gating of the dta line with cs is recommended to avoid bus conflict in applications incorporating multiple devices with individual reset conditions. 9.0 bit error rate test independent bit error rate (ber) test mechanisms are provided for the local and backplane ports. in both ports there is a ber transmitter and a ber receiver. the transmitter and receiver are each independently controlled to allow either looped back or uni-directional testing. the transmitter generates a 2 15 -1 or 2 23 -1 pseudo random binary sequence (prbs), which may be allocated to a specific stream and a number of channels. this is defined by a stream number, a start channel number, and the number of consecutive channels following the start channel. the stream, channel number and the number of consecutive channels following the start channel are similarly allocated for the receiver and detection of the prbs. examples of a channel sequence are presented in figure 16. when enabled, the receiver attempts to lock to the prbs on the incoming bit stream. once lock is achieved by detection of a seed value, a bit by bit comparison takes place and each error shall increment a 16-bit counter. a counter ?roll-over? shall occur in the event of an error count in excess of 65535. the ber operations are controlled by registers as follows (refer to section 13.3 "bit error rate test control register (bercr)" for overall control, section 13.9.2 "local bit error rate (ber) registers" and section 13.10 "backplane bit error rate (ber) registers" for register programming details): ? ber control register ( bercr ) - independently enables ber transmission and receive testing for backplane and local ports. ? local and backplane ber start send registers ( lbssr and bbssr ) - defines the output stream and start channel for ber transmission. ? local and backplane transmit ber length registers ( ltxblr and btxblr ) - defines, for transmit stream, how many consecutive channels to follow the start channel. ? local and backplane ber start receive registers ( lbsr and bbsr ) - define the input stream and channel from where the ber sequence will start to be compared. ? local and backplane receive ber length registers ( lrxblr and brxblr ) - defines, for the receive stream, how many consecutive channels follow the start channel. ? local and backplane ber count registers ( lbcr and bbcr ) - contain the number of counted errors. the registers listed completely define the transmit stream and channels. when ber transmission is enabled for these channels the source bits and the message mode bits, lsrc and lmm in the local connection memory, and bsrc and bmm in the backplane connection memory are ignored. the enable bits ( le and be ) of the respective connection memories should be set to high to enable the outputs for the selected channels.
data sheet MT90871 29 zarlink semiconductor inc. figure 16 - examples of ber transmission channels 10.0 memory built-in-self-test (bist) mode as operation of the memory bist will corrupt existing data, this test must only be instigated when the device is placed ?out-of-service? or isolated from live traffic. the memory bist mode is enabled through the microprocessor port (section 13.13 "memory bist register"). internal bist memory controllers generate the memory test pattern (s-march) and control the memory test. the memory test result is monitored through the memory bist register when controlled via the microprocessor interface. 11.0 jtag port the MT90871 jtag interface conforms to the boundary-scan ieee 1149.1 standard. the operation of the boundary-scan circuit shall be controlled by an external test access port (tap) controller. the jtag is intended to be used during the development cycle. the jtag interface is operational when the MT90871 core (v dd_core ) is powered at typical voltage levels. 11.1 test access port (tap) the test access port (tap) consists of four input pins and one output pin described as follows: ? test clock input (tck) tck provides the clock for the tap controller and is independent of any on-chip clock. tck permits the shifting of test data into or out of the boundary-scan registers cells, under the control of the tap controller in boundary-scan mode. ? test mode select input (tms) the tap controller uses the logic signals applied to the tms input to control test operations. the tms signals are sampled at the rising edge of the tck pulse. this pin is internally pulled to v dd_io when not driven from an external source. ? test data input (tdi) depending on the previously applied data to the tms input, the serial input data applied to the tdi port is connected either to the instruction register or to a test data register. both registers are described in a 11.2 "tap registers". the applied input data is sampled at the rising edge of tck pulses. this pin is internally pulled to v dd_io when not driven from an external source. ? test data output (tdo) depending on the previously applied sequence to the tms input, the contents of either the instruction frame boundary 0 1 2 ...... ..... 254 3 ..... ..... 255 0 1 2 ...... ..... 254 3 ..... ..... 255 0 1 2 ...... ..... 254 3 ..... ..... 255 0 1 channels containing data (traffic) channels containing prbs sequence start ch=0 length=256 start ch=0 length=3 start ch=254 length=4 0 0 1 1 fp8i fp stream once started ber transmission continues until stopped by the ber control register. 2 2 2 note: length = start chan. + no. of consecutive channels
MT90871 data sheet 30 zarlink semiconductor inc. register or data register are serially shifted out towards the tdo. the data out of the tdo is clocked on the falling edge of the tck pulses. when no data is shifted through the boundary scan cells, the tdo output is set to a high impedance state. ? test reset (trst ) trst provides an asynchronous reset to the jtag scan structure. this pin is internally pulled to v dd_io when not driven from an external source. this pin must be held low for normal (non-jtag) device operation. 11.2 tap registers the MT90871 uses the public instructions defined in the ieee 1149.1 standard with the provision of an instruction register and three test data registers. 11.2.1 test instruction register the jtag interface contains a four-bit instruction register. instructions are serially loaded into the instruction register from the tdi pin when the tap controller is in the shift-ir state. instructions are subsequently decoded to achieve two basic functions: to select the test data register to operate while the instruction is current, and to define the serial test data register path to shift data between tdi and tdo during data register scanning. 11.2.2 test data registers 11.2.2.1 the boundary-scan register the boundary-scan register consists of a series of boundary-scan cells arranged to form a scan path around the boundary of the MT90871 core logic. 11.2.2.2 the bypass register the bypass register is a single stage shift register to provide a one-bit path from tdi to tdo . 11.2.2.3 the device identification register the jtag device id for the MT90871 is 0087114b h . 11.3 boundary scan description language (bsdl) file a boundary scan description language (bsdl) file is available from zarlink semiconductor to aid in the use of the ieee 1149.1 test interface. version, bits <31:28>: 0000 part no., bits <27:12>: 0000 1000 0111 0001 manufacturer id, bits <11:1>: 0001 0100 101 header, bit <0> (lsb): 1
data sheet MT90871 31 zarlink semiconductor inc. 12.0 memory address mappings the device contains two data memory blocks, one for received backplane data and one for received local data. for all data rates the received data is converted to parallel format by internal serial to parallel converters and stored sequentially in the relevant data memory. 12.1 backplane data memory bit definition the 8-bit backplane data memory (bdm) has 4,096 positions. the locations are associated with the backplane input streams and channels. the address bits (a13:0) of the microprocessor define the addresses of the streams and the channels. the bdm is configured as follows: 12.2 local data memory bit definition the 8-bit local data memory (ldm) has 4,096 positions. the locations are associated with the local input streams and channels. the address bits of the microprocessor define the addresses of the streams and the channels. the ldm is configured as follows: 12.3 local connection memory bit definition the local connection memory (lcm) has 4,096 addresses of 16-bit words. each address, accessed through bits a13-a0 of the microprocessor port, is allocated to an individual local output stream and channel. the bit definition for each 16-bit word is presented in table 10, lcm bits for local-to-local and backplane-to-local switching. bit lsrc selects the switch configuration for backplane-to-local or local-to-local. when the per- address bit description a14 selects memory or register access a13-a9 stream address (0-15) a8-a0 channel address (0-255) notes: 1. bit a14 must be high for accessing to data and connection memory positions. bit a14 must be low for accessing registers. 2. channels 0 to 31 are used when serial stream is at 2.048mb/s. 3. channels 0 to 63 are used when serial stream is at 4.096mb/s. 4. channels 0 to 127 are used when serial stream is at 8.192mb/s. 5. channels 0 to 255 are used when serial stream is at 16.384mb/s. table 7- address map for data and connection memory locations (a14=1) bit name description 15-8 reserved set to a default value of 0 7-0 bdm backplane data memory backplane input channel data table 8- backplane data memory (bdm) bits bit name description 15-8 reserved set to a default value of 0 7-0 ldm local data memory local input channel data table 9- local data memory (ldm) bits
MT90871 data sheet 32 zarlink semiconductor inc. channel message mode is selected (lmm = high), the lower byte of the lcm word (lcab7-0) will be transmitted as data on the output stream (lsto0-15) in place of data defined by the source control, stream and channel address bits. . 12.4 backplane connection memory bit definition the backplane connection memory (bcm) has 4,096 addresses of 16-bit words. each address, accessed through bits a13-a0 of the microprocessor port, is allocated to an individual backplane output stream and channel. the bit definition for each 16-bit word is presented in table 11, bcm bits for local-to-backplane and backplane-to-backplane switching . bit bsrc selects the switch configuration for local-to-backplane or backplane-to-backplane. when the per- channel message mode is selected (bmm = high), the lower byte of the bcm word (bcab7-0) will be transmitted as data on the output stream (bsto0-15) in place of data defined by the source control, stream address and channel address bits. bit name description 15 lsrc source control bit when low, the source is from the backplane input port (backplane data memory). when high, the source is from the local input port (local data memory). ignored when lmm is set high. 14 lmm local message mode bit when low, the channel is in connection mode. when high, the channel is in message mode. 13 le local output enable bit when low the channel may be high impedance, either at the device output, or set by an external buffer dependent upon the lors pin. when high the channel is active. 12-8 lsab4-0 source stream address bits the binary value of these 5 bits represents the input stream number. ignored when lmm is set high. 7-0 lcab7-0 source channel address bits the binary value of these 8 bits represents the input channel number when lmm is set low. transmitted as data when lmm is set high. table 10- lcm bits for local-to-local and backplane-to-local switching bit name description 15 bsrc backplane source control bit. when low, the source is from the local input port (local data memory). when high, the source is from the backplane input port (backplane data memory). ignored when bmm is set high. 14 bmm backplane message mode bit. when low, the channel is in connection mode. when high, the channel is in message mode. 13 be backplane output enable bit. when low the channel may be high impedance, either at the device output or set by an external buffer, dependent upon the bors pin. when high the channel is active. 12-8 bsab4-0 backplane source stream address bits. the binary value of these 5 bits represents the input stream number. ignored when bmm is set high. table 11- bcm bits for local-to-backplane and backplane-to-backplane switching
data sheet MT90871 33 zarlink semiconductor inc. 12.5 internal register mappings 7-0 bcab7-0 source channel address bits. the binary value of these 8 bits represents the input channel number when bmm is set low. transmitted as data when bmm is set high. a14 - a0 register 0000 h control register, cr 0001 h block programming register, bpr 0002 h ber control register, bercr 0003 h - 0012 h local input channel delay register 0, lcdr0 - register 15, lcdr15 0023 h - 0032 h local input bit delay register 0, lidr0 - register 15, lidr15 0043 h - 0052 h backplane input channel delay register 0, bcdr0 - register 15, bcdr15 0063 h - 0072 h backplane input bit delay register 0, bidr0 - register 15, bidr15 0083 h - 0092 h local output advancement register 0, loar0 - register 15, loar15 00a3 h - 00b2 h backplane output advancement register 0, boar0 - register 15, boar15 00c3 h local ber start send register, lbssr 00c4 h local transmit ber length register, ltxblr 00c5 h local receive ber length register, lrxblr 00c6 h local ber start receive register, lbsrr 00c7 h local ber count register, lbcr 00c8 h backplane ber start send register, bbssr 00c9 h backplane transmit ber length register, btxblr 00ca h backplane receive ber length register, brxblr 00cb h backplane ber start receive register, bbsrr 00cc h backplane ber count register, bbcr 00cd h - 00dc h local input bit rate register 0, librr0 - register 15, librr15 00ed h - 00fc h local output bit rate register 0, lobrr0 - register 15, lobrr15 010d h - 011c h backplane input bit rate register 0, bibrr0 - register 15, bibrr15 012d h - 013c h backplane output bit rate register 0, bobrr0 - register 15, bobrr15 014d h memory bist register, mbistr 3fff h revision control register, rcr table 12- address map for register (a14 = 0) bit name description table 11- bcm bits for local-to-backplane and backplane-to-backplane switching (continued)
MT90871 data sheet 34 zarlink semiconductor inc. 13.0 detailed register description this section describes the registers that are used in the device. 13.1 control register (cr) address 0000h. the control register defines which memory is to be accessed, initiates the memory block programming mode, sets the applied clock and frame pulse conditions, and enables stream outputs. the control register ( cr ) is configured as follows: bit name reset description 15-9 reserved 0 reserved . 8fpw 0 frame pulse width when low, an input frame pulse width of 122ns shall be applied to fp8i . when high, an input frame pulse width of 244ns shall be applied to fp8i . 7 reserved 0 reserved . must be set low. 6c8ipol 0 8mhz input clock polarity the frame boundary is aligned to the clock falling or rising edge. when set low, the frame boundary is aligned to the clock falling edge. when set high, the frame boundary is aligned to the clock rising edge. 5copol 0 output clock polarity when set low, the output clock is the same polarity as the input clock. when set high, the output clock is inverted. this applies to both 8mhz (c8o )and 16mhz (c16o ) output clocks. 4mbp 0 memory block programming when low, the memory block programming mode is disabled. when high, the connection memory block programming mode is ready to program the local connection memory (lcm), and the backplane connection memory (bcm). 3osb 0 output stand by this bit enables the bsto0 - 15 and the lsto0 - 15 serial outputs . when low, the bsto0-15 and lsto0-15 are driven high or high impedance, dependent on the bors and lors pin settings respectively, and bcsto0-1 and lcsto0-1 are driven low. when high, the bsto0-15, lsto0-15, bcsto0-1 and lcsto0-1 are enabled. table 13- control register bits output control with ode pin and osb bit ode pin osb bit bsto0 - 15, lsto0 - 15 0x disable 10 disable 11 enable
data sheet MT90871 35 zarlink semiconductor inc. figure 17 - frame boundary conditions, st- bus operation 2-0 ms(2:0) 0 memory select bits. these three bits select the connection or data memory for subsequent micro-port memory access operations: 000, local connection memory (lcm) is selected for read or write operations. 001, backplane connection memory (bcm) is selected for read or write operations. 010, local data memory is selected for read-only operation. 011, backplane data memory is selected for read-only operation. bit name reset description table 13- control register bits (continued) frame boundary c8i_b fp8i_b frame pulse width = 122ns, control register bit8 (fpw) = 0 control register bit6 (c8ipol) = 0 (a) frame pulse width = 122ns, control register bit8 (fpw) = 0 control register bit6 (c8ipol) = 1 (b) frame pulse width = 244ns, control register bit8 (fpw) = 1 control register bit6 (c8ipol) = 0 (c) frame pulse width = 244ns, control register bit8 (fpw) = 1 control register bit6 (c8ipol) = 1 (d) c8i_b fp8i_b c8i_b fp8i_b c8i_b fp8i_b
MT90871 data sheet 36 zarlink semiconductor inc. figure 18 - frame boundary conditions, gci - bus operation 13.2 block programming register (bpr) address 0001h. the block programming register stores the bit patterns to be loaded into the connection memories when the memory block programming feature is enabled. the bpe, lbpd2-0 and bbpd2-0 bits in the bpr register must be defined in the same write operation. the bpe bit is set high, to commence the block programming operation. programming is completed in one frame period and may be be instigated at any time within a frame.the bpe bit returns to low to indicate the block programming function has completed. frame boundary pulse width = 122ns, control register bit8 (fpw) = 0 control register bit6 (c8ipol) = 0 (e) pulse width = 122ns, control register bit8 (fpw) = 0 control register bit6 (c8ipol) = 1 (f) pulse width = 244ns, control register bit8 (fpw) = 1 control register bit6 (c8ipol) = 0 (g) pulse width = 244ns, control register bit8 (fpw) = 1 control register bit6 (c8ipol) = 1 (h) c8i_b fp8i_b c8i_b fp8i_b c8i_b fp8i_b c8i_b fp8i_b
data sheet MT90871 37 zarlink semiconductor inc. when bpe is high, no other bits of the bpr register must be changed for at least a single frame period, except to abort the programming operation. the programming operation may be aborted by setting either bpe to low, or the control register bit, mbp, to low. the bpr register is configured as follows. . 13.3 bit error rate test control register (bercr) address 0002h. the ber control register controls backplane and local port ber testing. it independently enables and disables transmission and reception. it is configured as follows: bit name reset description 15-7 unused 0 set low . 6-4 bbpd(2:0) 0 backplane block programming data. these bits refer to the value loaded into the backplane connection memory (bcm) when the memory block programming feature is activated. when the mbp bit in the control register (cr) is set high and the bpe is set high, the contents of bits bbpd2-0 are loaded into bits 15-13, respectively, of the bcm. bits 12-0 of the bcm are set low 3-1 lbpd(2:0) 0 local block programming data. these bits refer to the value loaded into the local connection memory (lcm), when the memory block programming feature is activated. when the mbp bit in the control register is set high and the bpe is set high, the contents of bits lbpd2-0 are loaded into bits 15-13, respectively, of the lcm. bits 12-0 of the lcm are set low 0 bpe 0 block programming enable. a low to high transition of this bit enables the memory block programming function. a low will be returned after 125us, upon completion of programming. set low to abort the programming operation. table 14- block programming register bits bit name reset description 15-12 reserved 0 reserved. 11 lockb 0 backplane lock (read only). this bit is automatically set high when the receiver has locked to the incoming data sequence. the bit is reset by a low to high transition on sberrxb. 10 prstb 0 pber reset for backplane. a low to high transition initializes the backplane ber generator to the seed value. 9 cberb 0 clear bit error rate register for backplane. a low to high transition in this bit resets the backplane internal bit error counter and the backplane bit error (bberr) register to zero. table 15- bit error rate test control register (bercr) bits
MT90871 data sheet 38 zarlink semiconductor inc. 8 sberrxb 0 start bit error rate receiver for backplane. a low to high transition enables the backplane ber receiver. the receiver monitors incoming data for reception of the seed value. when detected, the lock state is indicated (lockb) and the receiver compares the incoming bits with the reference generator for bit equality and increments the backplane bit error register (bbcr) on each failure. when set low, bit comparison is disabled and the error count is frozen. the error count is stored in the backplane bit error register (bbcr). 7 sbertxb 0 start bit error rate transmitter for backplane. a low to high transition starts the ber transmission. when set low, transmission is disabled. 6 prbsb 0 ber mode select for backplane. when set high, a prbs sequence of length 2 23 -1 is selected for the backplane port. when set low, a prbs sequence of length 2 15 -1 is selected for the backplane port. 5lockl 0 local lock (read only). this bit is automatically set high when the receiver has locked to the incoming data sequence. the bit is reset by a low to high transition on sberrxl 4prstl 0 pber reset for local. a low to high transition initializes the local ber generator to the seed value. 3 cberl 0 clear bit error rate register for local. a low to high transition resets the local internal bit error counter and the local bit error (lberr) register to zero. 2 sberrxl 0 start bit error rate receiver for local. a low to high transition enables the local ber receiver. the receiver monitors incoming data for reception of the seed value. when detected, the lock state is indicated (lockl) and the receiver compares the incoming bits with the reference generator for bit equality and increments the local bit error register (lbcr) on each failure. when set low, bit comparison is disabled and the error count is frozen. the error count is stored in the local bit error register (lbcr). 1 sbertxl 0 start bit error rate transmitter for local. a low to high transition enables the local ber transmission. when set low, transmission is disabled. 0 prbsl 0 ber mode select for local. when set high, a prbs sequence of length 2 23 -1 is selected for the local port. when set low, a prbs sequence of length 2 15 -1 is selected for the local port. bit name reset description table 15- bit error rate test control register (bercr) bits (continued)
data sheet MT90871 39 zarlink semiconductor inc. 13.4 local input channel delay registers (lcdr0 to lcdr15) address 0003h to 0012h. sixteen local input channel delay registers (lcdr0 to lcdr15) allow users to program the input channel delay for the local input data streams lsti0-15. the possible adjustment is 255 channels and the lcdr0 to lcdr15 registers are configured as follows: : 13.4.1 local channel delay bits 7-0 (lcd7 - lcd0) these eight bits define the delay, in channel numbers, the serial interface receiver takes to store the channel data from the local stream input pins. the input channel delay can be set to 255 (16mb/s streams), 127 (8mb/s streams), 63 (4mb/s streams) or 31 (2mb/s streams) from the frame boundary. 13.5 local input bit delay registers (lidr0 to lidr15) address 0023h to 0032h. sixteen local input delay registers (lidr0 to lidr15) allow users to program the input bit delay for the local input data streams lsti0-15. the possible adjustment is up to 7 3/4 of the data rate, advancing forward with a resolution of 1/4 of the data rate. the data rate can be either 2mb/s, 4mb/s, 8mb/s or 16mb/s. lcdrn bit (where n = 0 to 15) name reset description 15-8 reserved 0 reserved 7-0 lcd(7:0) 0 local channel delay register the binary value of these bits refers to the channel delay value for the local input stream. table 16- local channel delay register (lcdrn) bits input stream channel delay corresponding delay bits lcd7-lcd0 0 channel (default) 0000 0000 1 channel 0000 0001 2 channels 0000 0010 3 channels 0000 0011 4 channels 0000 0100 5 channels 0000 0101 ... ... ... ... 253 channels 1111 1101 254 channels 1111 1110 255 channels 1111 1111 table 17- local input channel delay programming table
MT90871 data sheet 40 zarlink semiconductor inc. the lidr0 to lidr15 registers are configured as follows: 13.5.1 local input delay bits 4-0 (lid4 - lid0) these five bits define the delay from the bit boundary that the receiver uses to sample each input. input bit delay adjustment can range up to 7 3 / 4 bit periods forward, with resolution of 1 / 4 bit period. this can be described as: lidn(4:0) = (no. of bits delay) / 4. for example, if lidn(4:0) is set to 10011 (19), the input bit delay = 19 * 1 / 4 = 4 3 / 4. table 19 "local input bit delay programming table" illustrates the bit delay selection. lidrn bit (where n = 0 to 15) name reset description 15-5 reserved 0 reserved 4-0 lidn(4:0) 0 local input bit delay register the binary value of these bits refers to the input bit delay value for the local input stream table 18- local channel delay register (lidrn) bits corresponding delay bits data rate lid4 lid3 lid2 lid1 lid0 0 (default) 0 0 0 0 0 1/4 00001 1/2 00010 3/4 00011 1 00100 1 1/4 0 0 1 0 1 1 1/2 0 0 1 1 0 1 3/4 0 0 1 1 1 2 01000 2 1/4 0 1 0 0 1 2 1/2 0 1 0 1 0 2 3/4 0 1 0 1 1 3 01100 3 1/4 0 1 1 0 1 3 1/2 0 1 1 1 0 3 3/4 0 1 1 1 1 4 10000 4 1/4 1 0 0 0 1 table 19- local input bit delay programming table
data sheet MT90871 41 zarlink semiconductor inc. 13.6 backplane input channel delay registers (bcdr0 to bcdr15) address 0043h to 0052h sixteen backplane input channel delay registers (bcdr0 to bcdr15) allow users to program the input channel delay for the backplane input data streams bsti0-15. the possible adjustment is 255 channels and the bcdr0 to bcdr15 registers are configured as follows: 13.6.1 backplane channel delay bits 8-0 (bcdn8 - bcdn0) these eight bits define the delay, in channel numbers, the serial interface receiver takes to store the channel data from the backplane stream input pins. the input channel delay can be set to 255 (16mb/s streams), 127 (8mb/s streams), 63 (4mb/s streams) or 31 (2mb/s streams) from the frame boundary. 4 1/2 1 0 0 1 0 4 3/4 1 0 0 1 1 510100 5 1/4 1 0 1 0 1 5 1/2 1 0 1 1 0 5 3/4 1 0 1 1 1 611000 6 1/4 1 1 0 0 1 6 1/2 1 1 0 1 0 6 3/4 1 1 0 1 1 711100 7 1/4 1 1 1 0 1 7 1/2 1 1 1 1 0 7 3/4 1 1 1 1 1 bcdrn bit (where n = 0 to 15 ) name reset description 15-8 reserved 0 reserved 7-0 bcd(7:0) 0 backplane channel delay register the binary value of these bits refers to the channel delay value for the backplane input stream table 20- backplane channel delay register (bcdrn) bits corresponding delay bits data rate lid4 lid3 lid2 lid1 lid0 table 19- local input bit delay programming table (continued)
MT90871 data sheet 42 zarlink semiconductor inc. 13.7 backplane input bit delay registers (bidr0 to bidr15) address 0063h to 0072h sixteen backplane input delay registers (bidr0 to bidr15) allow users to program the input bit delay for the backplane input data streams bsti0-15. the possible adjustment is 7? of the data rate, in steps of ? of the data rate. the data rate can be either 2mb/s, 4mb/s, 8mb/s, or 16mb/s. the bidr0 to bidr15 registers are configured as follows: 13.7.1 backplane input delay bits 4-0 (bid4 - bid0 ) these five bits define how long in the cycle the serial interface receiver takes to recognize and stores the bit 0 from the bsti input pins: i.e., start assuming a new frame. input bit delay adjustment can range up to 7 3 / 4 bit periods forward with resolution of 1 / 4 bit period. this can be described as bidn(4:0) = (no. of bits delay) / 4 for example, if bid(4:0) is set to 10011 (19), the input bit delay = 19 * 1 / 4 = 4 3 / 4. table 23 illustrates the bit delay selection. input stream channel delay corresponding delay bits bcd7-bcd0 0 channel (default) 0000 0000 1 channel 0000 0001 2 channels 0000 0010 3 channels 0000 0011 4 channels 0000 0100 5 channels 0000 0101 ... ... ... ... 253 channels 1111 1101 254 channels 1111 1110 255 channels 1111 1111 table 21- backplane input channel delay (bcd) programming table bidrn bit (where n = 0 to 15) name reset description 15-5 reserved 0 reserved 4-0 bid(4:0) 0 backplane input bit delay register the binary value of these bits refers to the input bit delay value for the backplane input stream table 22- backplane input bit delay register (bidrn) bits
data sheet MT90871 43 zarlink semiconductor inc. corresponding delay bits data rate bid4 bid3 bid2 bid1 bid0 0 (default) 0 0 0 0 0 1/4 0 0 0 0 1 1/2 0 0 0 1 0 3/4 0 0 0 1 1 100100 1 1/4 0 0 1 0 1 1 1/2 0 0 1 1 0 1 3/4 0 0 1 1 1 201000 2 1/4 0 1 0 0 1 2 1/2 0 1 0 1 0 2 3/4 0 1 0 1 1 301100 3 1/4 0 1 1 0 1 3 1/2 0 1 1 1 0 3 3/4 0 1 1 1 1 410000 4 1/4 1 0 0 0 1 4 1/2 1 0 0 1 0 4 3/4 1 0 0 1 1 510100 5 1/4 1 0 1 0 1 5 1/2 1 0 1 1 0 5 3/4 1 0 1 1 1 611000 6 1/4 1 1 0 0 1 6 1/2 1 1 0 1 0 6 3/4 1 1 0 1 1 711100 7 1/4 1 1 1 0 1 7 1/2 1 1 1 1 0 7 3/4 1 1 1 1 1 table 23- backplane input bit delay programming table
MT90871 data sheet 44 zarlink semiconductor inc. 13.8 local output advancement registers (loar0 to loar15) address 0083h to 0092h. sixteen local output advancement registers (loar0 to loar15) allow users to program the output advancement for output data streams lsto0 to lsto15. the possible adjustment is -2, -4 or -6 cycles of the internal system clock (131.072mhz). the loar0 to loar15 registers are configured as follows: 13.8.1 local output advancement bits 1-0 (loa1-loa0) the binary value of these two bits is the amount of offset that a particular stream output can be advanced. when the advancement is 0, the serial output stream has the normal alignment with the local frame pulse. 13.9 backplane output advancement registers (boar0 - 15) address 00a3h to 00b2h sixteen backplane output advancement registers (boar0 to boar15) allow users to program the output advancement for output data streams bsto0 to bsto15. for 2mb/s, 4mb/s, 8mb/s and 16mb/s stream operation the possible adjustment is -2, -4 or -6 cycles of the internal system clock (131.072mhz). the boar0 to boar15 registers are configured as follows: loarn bit (where n = 0 to 15) name reset description 15-2 reserved 0 reserved 1-0 loa(1:0) 0 local output advancement register table 24- local output advancement register (loarn) bits local output advancement corresponding advancement bits clock rate 131.072mhz loa1 loa0 0 (default) 0 0 -2 cycle 0 1 -4 cycles 1 0 -6 cycles 1 1 table 25- local output advancement (loar) programming table boarn bit (where n = 0 to 15 ) name reset description 15-2 reserved 0 reserved 1:0 boa(1:0) 0 backplane output advancement register table 26- backplane output advancement register (boar) bits
data sheet MT90871 45 zarlink semiconductor inc. 13.9.1 backplane output advancement bits 1-0 (boa1-boa0) the binary value of these two bits is the amount of offset that a particular stream output can be advanced. when the advancement is 0, the serial output stream has the normal alignment with the backplane frame pulse. 13.9.2 local bit error rate (ber) registers 13.9.3 local ber start send register (lbssr) address 00c3h. local ber start send register defines the output channel and the stream in which the ber sequence starts to be transmitted. the lbssr register is configured as follows: 13.9.4 local transmit ber length register (ltxblr) address 00c4h local ber transmit length register ( ltxblr ) defines how many channels the ber sequence will be transmitted during each frame. the ltxblr register is configured as follows: backplane output advancement for 2mb/s, 4mb/s, 8mb/s & 16mb/s corresponding advancement bits clock rate 131.072 mhz boa1 boa0 0 (default) 0 0 -2 cycle 0 1 -4 cycles 1 0 -6 cycles 1 1 table 27- backplane output advancement (boar) programming table bit name reset description 15-13 reserved 0 reserved. 12-8 lbssa(4:0) 0 local ber send stream address bits. the binary value of these bits refers to the local output stream which carries the ber data. 7-0 lbsca(7:0) 0 local ber send channel address bits. the binary value of these bits refers to the local output channel in which the ber data starts to be sent. table 28- local ber start send register (lbssr) bits bit name reset description 15-8 reserved 0 reserved . 7-0 ltxbl(7:0) 0 local transmit ber length bits the binary value of these bits define the number of channels in addition to the start channel that the ber data will be transmitted on. (i.e. total channels = start channel + ltxbl value) table 29- local transmit ber length register (ltxblr) bits
MT90871 data sheet 46 zarlink semiconductor inc. 13.9.5 local receive ber length register (lrxblr) address 00c5h local ber receive length register ( lrxblr ) defines how many channels the ber sequence will be received during each frame. the lrxblr register is configured as follows: 13.9.6 local ber start receive register (lbsrr) address 00c6h local ber start receive register defines the input stream and start channel and the stream in which the ber sequence shall be received. the lbsrr register is configured as follows: 13.9.7 local ber count register (lbcr) address 00c7h local ber count register contains the number of counted errors. this register is read only. the lbcr register is configured as follows: bit name reset description 15-8 reserved 0 reserved . 7-0 lrxbl(7:0) 0 local receive ber length bits the binary value of these bits define the number of channels in addition to the start channel allocated for the ber receiver. (i.e. total channels = start channel + lrxbl value) table 30- local receive ber length register (lrxblr) bits bit name reset description 15-13 reserved 0 reserved. 12-8 lbrsa(4:0) 0 local ber receive stream address bits the binary value of these bits refers to the local input stream to receive the ber data. 7-0 lbrca(7:0) 0 local ber receive channel address bits the binary value of these bits refers to the local input start channel in which the ber data will be received. table 31- local ber start receive register (lbsrr) bits bit name reset description 15-0 lbc(15:0) 0 local bit error rate count the binary value of the bits define the local bit error count. table 32- local ber count register (lbcr) bits
data sheet MT90871 47 zarlink semiconductor inc. 13.10 backplane bit error rate (ber) registers 13.10.1 backplane ber start send register (bbssr) address 00c8h backplane ber start send register defines the output channel and the stream in which the ber sequence is transmitted. the bbssr register is configured as follows: 13.10.2 backplane transmit ber length register (btxblr) address 00c9h backplane transmit ber length register ( btxblr ) defines how many channels in each frame the ber sequence will be transmitted. the btxblr register is configured as follows: 13.10.3 backplane receive ber length register (brxblr) address 00cah backplane receive ber length register ( brxblr ) defines how many channels in each frame the ber sequence will be transmitted. the brxblr register is configured as follows: bit name reset description 15-13 reserved 0 reserved. 12-9 bbssa(3:0) 0 backplane ber send stream address bits the binary value of these bits define the backplane output stream to transmit the ber data. 8-0 bbsca(8:0) 0 backplane ber send channel address bits the binary value of these bits define the backplane output start channel in which the ber data is transmitted. table 33- backplane ber start send register (bbssr) bits bit name reset description 15-8 reserved 0 reserved. 7-0 btxbl(7:0) 0 backplane transmit ber length bits the binary value of these bits define the number of channels in addition to the start channel allocated for the ber transmitter. (i.e. total channels = start channel + btxbl value) table 34- backplane transmit ber length (btxblr) bits bit name reset description 15-8 reserved 0 reserved. 7-0 brxbl(7:0) 0 backplane receive ber length bits the binary value of these bits define the number of channels in addition to the start channel allocated for the ber receiver. (i.e. total channels = start channel + brxbl value) table 35- backplane receive ber length (brxblr) bits
MT90871 data sheet 48 zarlink semiconductor inc. 13.10.4 backplane ber start receive register (bbsrr) address 00cbh backplane ber start receive register defines the input stream and the start channel in which the ber sequence shall be received. the bbsrr register is configured as follows: 13.10.5 backplane ber count register (bbcr) address 00cch backplane ber count register contains the number of counted errors. this register is read only. the bbcr register is configured as follows: 13.11 local bit rate registers 13.11.1 local input bit rate registers (librr0-15) address 00cdh to 00dch. sixteen local input bit rate registers allow the bit rate for each individual stream to be set to 2, 4, 8 or 16 mb/s. the librr registers are configured as follows: bit name reset description 15-13 reserved 0 reserved. 12-9 bbrsa(3:0) 0 backplane ber receive stream address bits the binary value of these bits defines the backplane input stream that receives the ber data. 8-0 bbrca(8:0) 0 backplane ber receive channel address bits the binary value of these bits define the backplane input start channel in which the ber data will be received. table 36- backplane ber start receive register (bbsrr) bits bit name reset description 15-0 bbc(15:0) 0 backplane bit error rate count the binary value of these bits define the backplane bit error count. table 37- backplane ber count register (bbcr) bits librn (for n=0 to 15) name reset description 15-2 reserved 0 reserved 1-0 libr(1:0) 0 local input bit rate table 38- local input bit rate register (librrn) bits
data sheet MT90871 49 zarlink semiconductor inc. 13.11.2 local output bit rate resisters (lobrr0-15) address 00edh to 00fch. sixteen local output bit rate registers allow the bit rate for each individual stream to be set to 2, 4, 8 or 16 mb/s. the lobrr registers are configured as follows: 13.12 backplane bit rate registers 13.12.1 backplane input bit rate registers (bibrr0-15) address 010dh to 011ch sixteen backplane input bit rate registers allow the bit rate for each individual stream to be set to 2, 4, 8 or 16 mb/s. the bibrr registers are configured as follows: libr1 libr0 bit rate for stream n 00 2mb/s 01 4mb/s 10 8mb/s 11 16mb/s table 39- local input bit rate (libr) programming table lobrn bit (where n = 0 to 15) name reset description 15-2 reserved 0 reserved 1-0 lobr(1:0) 0 local output bit rate table 40- local output bit rate register (lobrrn) bits lobr1 lobr0 bit rate for stream n 0 0 2mb/s 0 1 4mb/s 1 0 8mb/s 11 16mb/s table 41- output bitrate (lobr) programming register bibrn bit (for n=0 to 15) name reset description 15-2 reserved 0 reserved 1-0 bibr(1:0) 0 backplane input bit rate table 42- backplane input bit rate register (bibrrn) bits
MT90871 data sheet 50 zarlink semiconductor inc. 13.12.2 backplane output bit rate registers (bobrr0-15) address 012dh to 013ch sixteen backplane output bit rate registers allow the bit rate for each individual stream to be set to 2, 4, 8 or 16 mb/s. the bobrr registers are configured as follows: 13.13 memory bist register address 014dh the memory bist register enables the self-test of chip memory. two consecutive write operations are required to start mbist. the first with only bit 12 (lv_tm) set high (i.e. 1000h), the second with bit 12 maintained high but with the required start bit(s) set high. the mbistr register is configured as follows: bibr1 bibr0 bit rate for stream n 0 0 2mb/s 0 1 4mb/s 1 0 8mb/s 1 1 16mb/s table 43- backplane input bit rate (bibr) programming table bobrn bit (for n=0 to 15) name reset description 15-2 reserved 0 reserved 1-0 bobr(1:0) 0 backplane output bit rate table 44- backplane output bit rate register (bobrrn) bits bobr1 bobr0 bit rate for stream n 00 2mb/s 01 4mb/s 10 8mb/s 11 16mb/s table 45- backplane output bit rate (bobrr) programming table bit name reset description 15-13 reserved 0 reserved. 12 lv_tm 0 mbist test enable. high for mbist mode, low for scan mode. 11 bistsdb 0 backplane data memory start bist sequence. sequence enabled on low to high transition. table 46- memory bist register (mbistr) bits
data sheet MT90871 51 zarlink semiconductor inc. 13.14 revision control register address 3fffh the revision control register stores the binary value of the silicon revision number. this register is read only. the rcr register is configured as follows: 10 bistcdb 0 backplane data memory bist sequence completed. (read only). high indicates completion of memory bist sequence. 9bistpdb 0 backplane data memory pass/fail bit (read only). this bit indicates the pass/fail status following completion of the memory bist sequence. a high indicates pass, a low indicates fail. 8bistsdl 0 local data memory start bist sequence. sequence enabled on low to high transition. 7bistcdl 0 local data memory bist sequence completed. (read only). high indicates completion of memory bist sequence. 6bistpdl 0 local data memory pass/fail bit (read only). this bit indicates the pass/fail status following completion of the memory bist sequence. a high indicates pass, a low indicates fail. 5bistscb 0 backplane connection memory start bist sequence. sequence enabled on low to high transition. 4 bistccb 0 backplane connection memory bist sequence completed. (read only). high indicates completion of memory bist sequence. 3bistpcb 0 backplane connection memory pass/fail bit (read only). this bit indicates the pass/fail status following completion of the memory bist sequence. a high indicates pass, a low indicates fail. 2bistscl 0 local connection memory start bist sequence. sequence enabled on low to high transition. 1bistccl 0 local connection memory bist sequence completed. (read only). high indicates completion of memory bist sequence. 0bistpcl 0 local connection memory pass/fail bit (read only). this bit indicates the pass/fail status following completion of the memory bist sequence. a high indicates pass, a low indicates fail. bit name reset value description 15-4 reserved 0 reserved. 3-0 rc(3:0) defined by silicon revision control bits. table 47- revision control register (rcr) bits bit name reset description table 46- memory bist register (mbistr) bits (continued)
MT90871 data sheet 52 zarlink semiconductor inc. dc electrical characteristics * exceeding these values may cause permanent damage. functional operation under these conditions is not implied. voltages are with respect to ground (v ss ) unless otherwise stated. absolute maximum ratings* parameter symbol min max units 1 i/o supply voltage v dd_io -0.5 5.0 v 2 core supply voltage v dd_core -0.5 2.5 v 3 pll supply voltage v dd_pll -0.5 2.5 v 4 input voltage (non-5v tolerant inputs) v i -0.5 v dd_io +0.5 v 5 input voltage (5v tolerant inputs) v i_5v -0.5 7.0 v 6 continuous current at digital outputs i o 15 ma 7 package power dissipation p d 2w 8 storage temperature t s - 55 +125 c recommended operating conditions characteristics sym min typ max units 1 operating temperature t op -40 25 +85 c 2 positive supply v dd_io 3.0 3.3 3.6 v 3 positive supply v dd_core 1.62 1.8 1.98 v 4 positive supply v dd_pll 1.62 1.8 1.98 v 5 input voltage v i 03.3v dd_io v 6 input voltage on 5v tolerant inputs v i_5v 055.5v dc electrical parameters characteristics sym min typ max units test conditions 1 s u p p l i e s static core supply current i dd-core 4 ma static i dd_core and pll current 2 operating core supply current i dd-core 160 200 ma applied clock c8i = 8.192 mhz 3 static periphery supply current i dd_io 100 a static i dd_io 4 operating periphery supply current i dd_io 55 ma i av with all output streams at max. data-rate. c load = 50pf
data sheet MT90871 53 zarlink semiconductor inc. voltages are with respect to ground (v ss ) unless otherwise stated. 5 i n p u t s input high voltage v ih 2.0 v 6 input low voltage v il 0.8 v 7 input leakage (input pins) input leakage (bi-directional pins) i il i bl 5 5 a a 0 < v i < v dd_io 8 weak pullup current i pu -200 a input at 0v 9 weak pulldown current i pd 200 a input at v in = 5.5v 10 input pin capacitance c i 5pf 11 o u t p u t s output high voltage v oh 2.4 v i oh = 10ma 12 output low voltage v ol 0.4 v i ol = 10ma 13 high impedance leakage i oz 5 a0 < v o < v dd_io 14 output pin capacitance c o 5pf ac electrical characteristics timing parameter measurement: voltage levels characteristics sym level units conditions 1 cmos threshold v ct 0.5v dd_io v 3.0v < vdd_io < 3.6v 2 rise/fall threshold voltage high v hm 0.7v dd_io v 3.0v < vdd_io < 3.6v 3 rise/fall threshold voltage low v lm 0.3v dd_io v 3.0v < vdd_io < 3.6v dc electrical parameters (continued) characteristics sym min typ max units test conditions
MT90871 data sheet 54 zarlink semiconductor inc. backplane and local clock timing characteristic sym min typ max units notes 1 backplane frame pulse width t bfpw244 t bfpw122 t bgfpw 210 10 10 244 122 122 350 220 220 ns fig. 19 & fig. 20 2 backplane frame pulse setup time before c8i clock falling edge t bfps244 t bfps122 t bgfps 5 5 5 110 110 110 ns 3 backplane frame pulse hold time from c8i clock falling edge t bfph244 t bfph122 t bgfph 5 5 5 110 110 110 ns 4c8i clock period t bcp8 120 122 124 ns 5c8i clock pulse width high t bch8 50 61 70 ns 6c8i clock pulse width low t bcl8 50 61 70 ns 7c8i clock rise/fall time t rbc8i , t fbc8i 02 3ns 8c8i cycle to cycle variation t cvc8i 3ns 9 local frame boundary offset t lfbos 7.5 ns c l =60pf 10 fp8o width t lfpw8 t gfpw8 117 117 122 122 127 127 ns c l =60pf 11 fp8o output delay from edge to local frame boundary t fodf8 t gfps8o 56 56 68 56 ns 12 fp8o output delay from local frame boundary to edge t fodr8 t gfph8o 59 59 61 61 ns 13 c8o clock period t lcp8 117 127 ns c l =60pf 14 c8o clock pulse width high t lch8 56 68 ns 15 c8o clock pulse width low t lcl8 59 61 ns 16 c8o clock rise/fall time t rlc8o , t flc8o 37ns 17 fp16o width t fpw16 62 66 ns c l =60pf 18 fp16o output delay from falling edge to local frame boundary t fodf16 -29 -36 ns 19 fp16o output delay from local frame boundary to rising edge t fodr16 30 33 ns 20 c16o clock period t lcp16 62 66 ns c l =60pf 21 c16o clock pulse width high t lch16 29 36 ns 22 c16o clock pulse width low t lcl16 30 33 ns 23 c16o clock rise/fall time t rlc16o , t flc16o 05ns
data sheet MT90871 55 zarlink semiconductor inc. figure 19 - backplane and local clock timing diagram for st-bus t bfpw122 t bfph122 t bfps122 ck_int * t lfpw8 t lfodr8 t lfodf8 t fodr16 t fodf16 t lch8 t lcl8 t lcl16 t lch16 t fpw16 t lcp8 t lcp16 t flc8o t rlc8o t rlc16o t flc16o t lfbos * ck_int is the internal clock signal of 131.072mhz fp8o c8o fp16o c16o fp8i c8i t bch8 t bcl8 t bcp8 t fbc8i t rbc8i t lfpw8_244 t fodr8_244 t fodf8_244 t bfpw244 t bfph244 t bfps244 fp8i fp8o (244ns) (122ns) (244ns) (122ns)
MT90871 data sheet 56 zarlink semiconductor inc. figure 20 - backplane and local clock timing for gci-bus t bgfpw t fbci t bch8 t bcl8 t rbci ck_int* t gfpw8 t gfph8o t gfps8o t frh16o t frs16o t lch8 t lcl8 t lch16 t lcl16 t fpw16 t lcp8 t lcp16 t bcp8 t flc8o t rlc8o t rlc16o t flc16o t lfbos * ck_int is the internal clock signal of 131.072mhz fp8o c8o fp16o c16o fp8i c8i t bgfph t bgfps
data sheet MT90871 57 zarlink semiconductor inc. figure 21 - st-bus backplane data timing diagram (8mb/s, 4mb/s, 2mb/s) backplane data timing characteristic sym min typ max units notes 1 backplane input data sampling point t bids16 t bids8 t bids4 t bids2 41 87 178 361 46 92 183 366 51 97 188 371 ns 2 backplane serial input set-up time t bsis16 t bsis8 t bsis4 t bsis2 2.1 2.1 2.1 2.1 ns 3 backplane serial input hold time t bsih16 t bsih8 t bsih4 t bsih2 3 3 3 3 ns 4 backplane serial output delay t bsod16 t bsod8 t bsod4 t bsod2 10.5 10.5 10.5 10.5 ns c l =50pf ck_int * bsti0 - 15 bsto0 - 15 t bids8 8.192mb/s 8.192mb/s * ck_int is the internal clock signal of 131.072mhz fp8i c8i t bids4 t bids2 t bsih8 t bsis8 t bsih4 t bsis4 t bsih2 t bsis2 t bsod2 t bsod4 t bsod8 bsto0 - 15 4.096mb/s bsto0 - 15 2.048mb/s bsti0 - 15 4.096mb/s bsti0 - 15 2.048mb/s bit7 ch0 bit6 ch0 bit7 ch0 bit6 ch0 bit0 ch31 bit0 ch63 bit7 ch0 bit6 ch0 bit5 ch0 bit4 ch0 bit7 ch0 bit6 ch0 bit0 ch31 bit5 ch0 bit4 ch0 bit6 ch0 bit7 ch0 bit0 ch63 bit1 ch127 bit0 ch127 bit5 ch0 bit4 ch0 bit3 ch0 bit2 ch0 bit1 ch0 6 5 0 4 3 2 1 1 7
MT90871 data sheet 58 zarlink semiconductor inc. figure 22 - st-bus backplane data timing diagram (16mb/s) ck_int * fp8i c8i t bids16 t bsih16 t bsis16 t bsod16 bsto0 - 15 16.384mb/s bsti0 - 15 16.384mb/s bit0 ch255 bit7 ch0 bit6 ch0 bit5 ch0 bit5 ch0 bit6 ch0 bit7 ch0 bit0 * ck_int is the internal clock signal of 131.072mhz bit1 ch 255 ch 255
data sheet MT90871 59 zarlink semiconductor inc. figure 23 - gci bus backplane data timing diagram (8mb/s, 4mb/s, 2mb/s) figure 24 - gci bus backplane data timing diagram (16mb/s) ck_int * bsti0 - 15 bsto0 - 15 t bids8 8.192mb/s 8.192mb/s * ck_int is the internal clock signal of 131.072mhz fp8i c8i t bids4 t bids2 t bsih8 t bsis8 t bsih4 t bsis4 t bsih2 t bsis2 t bsod2 t bsod4 t bsod8 bsto0 - 15 4.096mb/s bsto0 - 15 2.048mb/s bsti0 - 15 4.096mb/s bsti0 - 15 2.048mb/s bit0 ch0 bit1 ch0 bit0 ch0 bit1 ch0 bit7 ch31 bit7 ch63 bit0 ch0 bit1 ch0 bit2 ch0 bit3 ch0 bit0 ch0 bit1 ch0 bit7 ch31 bit2 ch0 bit3 ch0 bit1 ch0 bit0 ch0 bit7 ch63 bit6 ch127 bit7 ch127 bit2 ch0 bit3 ch0 bit4 ch0 bit5 ch0 bit6 ch0 1 2 7 3 4 5 6 6 0 ck_int * fp8i c8i t bids16 t bsih16 t bsis16 t bsod16 bsto0 - 15 16.384mb/s bsti0 - 15 16.384mb/s bit7 ch255 bit0 ch0 bit1 ch0 bit2 ch0 bit2 ch0 bit1 ch0 bit0 ch0 * ck_int is the internal clock signal of 131.072mhz ch255 ch255 bit6 bit7
MT90871 data sheet 60 zarlink semiconductor inc. local clock data timing characteristic sym min typ max units notes 1 local frame boundary offset t lfbos 15 ns c l =50pf 2 input data sampling point t lids16 t lids8 t lids4 t lids2 41 87 178 361 46 92 183 366 51 97 188 371 ns 3 local serial input set-up time t lsis16 t lsis8 t lsis4 t lsis2 2.1 2.1 2.1 2.1 ns 4 local serial input hold time t lsih16 t lsih8 t lsih4 t lsih2 3 3 3 3 ns 5 local serial output delay t lsod16 t lsod8 t lsod4 t lsod2 10.5 10.5 10.5 10.5 ns c l =50pf
data sheet MT90871 61 zarlink semiconductor inc. figure 25 - st-bus local timing diagram (8mb/s, 4mb/s, 2mb/s) figure 26 - st-bus local data timing diagram (16mb/s) ck_int * lsti0 - 15 lsto0 - 15 t lids8 8.192mb/s 8.192mb/s t lfbos fp8i c8i t lids4 t lids2 t lsih8 t lsis8 t lsih4 t lsis4 t lsih2 t lsis2 t lsod2 t lsod4 t lsod8 lsto0 - 15 4.096mb/s lsto0 - 15 2.048mb/s lsti0 - 15 4.096mb/s lsti0 - 15 2.048mb/s bit7 ch0 bit6 ch0 bit7 ch0 bit6 ch0 bit0 ch31 bit0 ch63 bit7 ch0 bit6 ch0 bit5 ch0 bit4 ch0 bit7 ch0 bit6 ch0 bit0 ch31 bit5 ch0 bit4 ch0 bit6 ch0 bit7 ch0 bit0 ch63 bit1 ch127 bit0 ch127 bit5 ch0 bit4 ch0 bit3 ch0 bit2 ch0 bit1 ch0 6 5 0 4 3 2 1 1 7 * ck_int is the internal clock signal of 131.072mhz ck_int * fp8i c8i t lids16 t lsih16 t lsis16 t lsod16 lsto0 - 15 16.384mb/s lsti0 - 15 16.384mb/s bit0 ch255 bit7 ch0 bit6 ch0 bit5 ch0 bit5 ch0 bit6 ch0 bit7 ch0 bit0 * ck_int is the internal clock signal of 131.072mhz bit1 t lfbos ch255 ch255
MT90871 data sheet 62 zarlink semiconductor inc. note 1: high impedance is measured by pulling to mid-rail with rl = 1k/1k potential divider, with timing corrected to cancel tim e taken to discharge cl. figure 27 - serial output and external control figure 28 - output driver enable (ode) backplane and local output high-impedance timing characteristic sym min typ max units test conditions 1 sto delay - active to high-z - high-z to active t dz t zd 4 4 ns ns r l =1k, c l =50pf, see note 1 2 output driver enable (ode) delay to active data output driver enable (ode) delay to high-impedance t ode t odz 15 14 ns ns r l =1k, c l =50pf, see note 1 r l =1k, c l =50pf, see note 1 t dz sto t zd sto clk vtt vtt hiz valid data vtt hiz valid data vtt hi-z hi-z sto ode t odz t ode valid data vtt
data sheet MT90871 63 zarlink semiconductor inc. note 1: high impedance is measured by pulling to mid-rail with r l = 1k/1k potential divider, with timing corrected to cancel time taken to discharge c l . figure 29 - motorola non-multiplexed bus timing note: there must be a minimum of 30ns between cpu accesses, to allow the mt90869 device to recognize the accesses as separate (i.e. a minimum of 30ns must separate the de-assertion of dta_b (to high) and the assertion of cs_b and/or ds_b (to initiate the next access). non-multiplexed microprocessor port timing characteristics sym min typ max units test conditions 1cs setup from ds falling t css 0ns 2r/w setup from ds falling t rws 8ns 3 address setup from ds falling t ads 8ns 4cs hold after ds rising t csh 0ns 5r/w hold after ds rising t rwh 8ns 6 address hold after ds rising t adh 8ns 7 data setup from dta low on read t ddr 14 ns c l =60pf 8 data hold on read t dhr 30 ns c l =60pf, r l =1k, note 1 9 data setup on write t wds 8ns 10 data hold on write t dhw 8ns 11 acknowledgment delay: reading/writing registers reading/writing memory t akd 85 70 ns ns c l =60pf c l =60pf 12 acknowledgment hold time t akh 12 ns c l =60pf, r l =1k, note 1 a0-a14 d0-d15 d0-d15 read write t css t csh t adh t dhr t rws t ads t rwh t dhw t akd t wds t ddr t akh v tt v tt v tt v tt v tt v tt v tt valid address valid read data valid write data dta r/w cs ds
c zarlink semiconductor 2003 all rights reserved. apprd. issue date acn package code previous package codes: conforms to jedec ms - 034 except dimensions 'a1' and 'b'. 2 layers (4 layers) 1. controlling dimensions are in mm. 2. seating plane is defined by the spherical crown of 3. not to scale. 4. ball arrangement: 14 x 14 array the solder balls. notes:- a2 top view j bottom view side view i j b n e e e1 i d d1 dimension a a1 0.85 0.75 0.60 0.40 1.0 ref. 1.00 bsc 196 15.00 bsc 15.00 bsc 1.0 ref. 12.95 12.95 13.70 13.70 min 1.35 (1.55) 0.30 max 0.50 1.75 (1.97)
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