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| White Electronic Designs WEDPNF8M721V-XBX 8Mx72 Synchronous DRAM + 8Mb Flash Mixed Module Multi-Chip Package ADVANCED* FEATURES n n n Package: * 275 Plastic Ball Grid Array (PBGA), 32mm x 25mm Commercial, Industrial and Military Temperature Ranges Weight: * WEDPNF8M721V-XBX - 2.5 grams typical n n n n Sector Architecture * One 16KByte, two 8KBytes, one 32KByte, and fif teen 64KBytes in byte mode * One 8K word, two 4K words, one 16K word, and fifteen 32K word sectors in word mode. * Any combination of sectors can be concurrently erased. Also supports full chip erase Boot Code Sector Architecture (Bottom) Embedded Erase and Program Algorithms Erase Suspend/Resume * Supports reading data from or programing data to a sector not being erased SDRAM PERFORMANCE FEATURES n n n n n n n n Organized as 8M x 72 High Frequency = 100, 125MHz Single 3.3V 0.3V power supply Fully Synchronous; all signals registered on positive edge of system clock cycle Internal pipelined operation; column address can be changed every clock cycle Internal banks for hiding row access/precharge Programmable Burst length 1,2,4,8 or full page 4096 refresh cycles BENEFITS n n n n n n 42% SPACE SAVINGS Reduced part count Reduced I/O count * 14% I/O Reduction Suitable for hi-reliability applications SDRAM Upgradeable to 16M x 72 density (contact factory for information) Flash upgradeable to 2M x 8 (or 1M x 16 or 512K x 32) density FLASH PERFORMANCE FEATURES n n n n User Configurable as 1Mx8 or 512Kx16 Access Times of 100, 120, 150ns 3.3 Volt for Read and Write Operations 1,000,000 Erase/Program Cycles * This data sheet describes a product that may or may not be under development and is subject to change or cancellation without notice. September 2002 Rev. 3 1 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs FIG. 1 PIN CONFIGURATION TOP VIEW WEDPNF8M721V-XBX NOTES: 1. DNU = Do Not Use 2. FD16-31, BYTE2, RY/BY2 are NC in this part, and used for flash upgraded to WEDPN8M722V-XBX (2x8M Flash). White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 2 White Electronic Designs FIG. 2 FUNCTIONAL BLOCK DIAGRAMS WEDPNF8M721V-XBX SDRAM FLASH 3 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs PACKAGE PINOUT LISTING Signal Name VCC GND FD0 - 15 RYBY1 RST BYTE1 FD16* - 31* RYBY2* BYTE2* FA1-19 FCS1 FCS2* FWE FOE A0 - A11 BA0 - 1 CS0 WE0 CLK0 CKE0 RAS0 CAS0 DQML0 DQMH0 CS1 WE1 CLK1 CKE1 RAS1 CAS1 DQML1 DQMH1 CS2 WE2 CLK2 CKE2 RAS2 CAS2 DQML2 DQMH2 CS3 WE3 CLK3 CKE3 RAS3 Pin Number WEDPNF8M721V-XBX D15, E15, F8, F10, F15, G4, H4, J14, J15, J16, J17, K2, K3, K4, K5, L14, L15, L16, M5, M14, M15, N4, N5, N7, N8, N14, P4, P5, P6, P7, P11, P12, P13, P14, R4, T15, U15, V15 D4, D16, E4, F4, F7, F9, F11, F12, F13, G14, G15, H15, J2, J3, J4, J5, K14, K15, K16, K17, L4, L5, M4, N6, N9, N10, N11, N12, N13, N15, P8, P9, P10, P15, R15, T4, U4, V4 E8, C8, E9, C9, C10, D11, C11, D12, D8, B8, D9, D10, E10, E11, E12, E13 H5 A7 D13 C12, C15, A15, B9, B11, B13, A10, A12, C13, B15, B14, B10, B12, A9, A11, A14 A8 A13 F14, F5, E7, E6, E5, D6, D5, C6, C5, C4, B6, B5, B4, A6, A5, A4, C14, D7, C7 H14 E14 B7 D14 V12, U13, V13, V14, T14, R13, T13, R12, T12, R11, U12, T11 U11, V11 H3 E3 C3 B3 G3 F3 H2 D3 H18 J18 B18 A18 G18 F18 E18 C18 T18 R18 L18 K18 U18 V18 V17 M18 U3 V3 M3 L3 T3 *FD16-31, RY/BY2, BYTE2 are NC in this part, and used for flash upgrade to WEDPNF8M722V-XBX White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 4 White Electronic Designs Signal Name CAS3 DQML3 DQMH3 CS4 WE4 CLK4 CKE4 RAS4 CAS4 DQML4 DQMH4 DQ0 - 15 DQ16 - 31 DQ32 - 47 DQ48 - 63 DQ64 - 79 DNU R3 U2 N3 T10 U9 R9 R10 U10 V10 V9 T9 E1, F1, E2, G1, F2, H1, J1, G2, A3, A2, B2, C2, B1, D2, C1, D1, Pin Number WEDPNF8M721V-XBX PACKAGE PINOUT LISTING (CONTINUED) E16, F16, G16, H16, E17, F17, G17, H17, D18, A17, B17, C17, D17, A16, B16, C16 R17, T17, U16, V16, T16, R16, U17, P18, N16, P16, P17, M16, M17, N17, N18, L17 R1, P2, T1, R2, P3, U1, V2, T2, M2, N2, L2, M1, P1, N1, L1, K1 U8, U6, V5, V6, U7, U5, V7, V8, R8, R6, T8, T6, R7, R5, T7, T5 F6, G5, R14, U14, V1 5 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage Range (VCC) Signal Voltage Range Operating Temperature TA (Mil) Operating Temperature TA (Ind) Storage Temperature, Plastic Flash Endurance (write/erase cycles) -0.5 to +4.0 -0.5 to Vcc +0.5 -55 to +125 -40 to +85 -65 to +150 1,000,000 min. Unit V V C C C cycles WEDPNF8M721V-XBX SDRAM CAPACITANCE (NOTE 2) Parameter Input Capacitance: CLK Addresses, BA0-1 Input Capacitance Input Capacitance: All other input-only pins Input/Output Capacitance: I/Os Symbol CI1 CA CI2 CIO Max 10 35 10 12 Unit pF pF pF pF NOTE: Stress greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions greater than those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. FLASH DATA RETENTION Parameter Minimum Pattern Data Retention Time Test Conditions 150C 125C Min 10 20 Unit Years Years DC ELECTRICAL CHARACTERISTICS AND OPERATING CONDITIONS (NOTES 1, 3) (VCC = +3.3V 0.3V; TA = -55C TO +125C) Parameter/Condition Supply Voltage Input High Voltage: Logic 1; All inputs (4) Input Low Voltage: Logic 0; All inputs (4) SDRAM Input Leakage Current: Any input 0V VIN VCC (All other pins not under test = 0V) SDRAM Input Leakage Address Current (All other pins not under test = 0V) SDRAM Output Leakage Current: I/Os are disabled; 0V VOUT VCC SDRAM Output High Voltage (IOUT = -4mA) SDRAM Output Low Voltage (IOUT = 4mA) Flash Flash Input Leakage Current (VCC = 3.6, VIN = GND or VCC) Flash Output Leakage Current (VCC = 3.6, VIN = GND or VCC) Flash Output High Voltage (IOH = -2.0 mA, VCC = 3.0) Flash Output Low Voltage (IOL = 5.8 mA, VCC = 3.0) Flash Low VCC Lock-Out Voltage (5) Symbol Min VCC VIH VIL II 3 0.7 x Vcc -0.3 -5 Max 3.6 VCC + 0.3 0.8 5 V V V A Units II IOZ VOH VOL ILI ILOx8 VOH1 VOL VLKO -25 -5 2.4 - 25 5 - 0.4 10 10 A A V V A A V 0.85 X VCC 0.45 2.3 2.5 V V NOTES: 1. All voltages referenced to VSS. 2. This parameter is not tested but guaranteed by design. f = 1 MHz, TA = 25C. 3. An initial pause of 100ms is required after power-up, followed by two AUTO REFRESH commands, before proper device operation is ensured. (VCC must be powered up simultaneously.) The two AUTO REFRESH command wake-ups should be repeated any time the tREF refresh requirement is exceeded. 4. VIH overshoot: VIH (MAX) = VCC + 2V for a pulse width 3ns, and the pulse width cannot be greater than one third of the cycle rate. VIL undershoot: VIL (MIN) = -2V for a pulse width 3ns. 5. Guaranteed by design, but not tested. White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 6 White Electronic Designs WEDPNF8M721V-XBX ICC SPECIFICATIONS AND CONDITIONS (NOTES 1,2,3,4) (VCC = +3.3V 0.3V; TA = -55C TO +125C) Parameter/Condition SDRAM Operating Current: Active Mode; Burst = 2; Read or Write; tRC = tRC (min); CAS latency = 3 (5, 6, 7); FCS = High SDRAM Standby Current: Active Mode; CKE = HIGH; CS = HIGH; FCS = High; All banks active after tRCD met; No accesses in progress (5, 7, 8) SDRAM Operating Current: Burst Mode; Continuous burst; FCS = High Read or Write; All banks active; CAS latency = 3 (5, 6, 7) SDRAM Self Refresh Current; FCS = High (14) Flash VCC Active Current for Read : FCS = VIL, FOE = VIH, f = 5MHz (9), CS = High, CKE = Low Flash VCC Active Current for Program or Erase: FCS = VIL, FOE = VIH, CS = High, CKE = Low Standby Current: VCC = 3.6 Max, FCS = VIH, CS = High, CKE = Low Symbol ICC1 ICC3 ICC4 ICC7 IFCC1 IFCC2 ICC3 Max 750 250 750 10 32 50 20 Units mA mA mA mA mA mA mA NOTES: 1. All voltages referenced to VSS. 2. An initial pause of 100ms is required after power-up, followed by two AUTO REFRESH commands, before proper device operation is ensured. (VCC must be powered up simultaneously.) The two AUTO REFRESH command wake-ups should be repeated any time the tREF refresh requirement is exceeded. 3. AC timing and ICC tests have VIL = 0V and VIH = 3V, with timing referenced to 1.5V crossover point. 4. ICC specifications are tested after the device is properly initialized. 5. ICC is dependent on output loading and cycle rates. Specified values are obtained with minimum cycle time and the outputs open. 6. The ICC current will decrease as the CAS latency is reduced. This is due to the fact that the maximum cycle rate is slower as the CAS latency is reduced. 7. Address transitions average one transition every two clocks. 8. Other input signals are allowed to transition no more than once every two clocks and are otherwise at valid VIH or VIL levels. 9. The ICC current listed includes both the DC operating current and the frequency dependent component (at 5 MHz). The frequency component typically is less than 8 mA/MHz, with OE at VIH. 10. ICC active while Embedded Algorithm (program or erase) is in progress. 11. Maximum ICC specifications are tested with VCC = VCC Max. 12. Automatic sleep mode enables the low power mode when addressed remain stable for tacc + 30 ns. 13. SDRAM inactive and in Power Down mode, all banks idle. 14. Self refresh available in commercial and industrial temperatures only. SDRAM DESCRIPTION The 64MByte (512Mb) SDRAM is a high-speed CMOS, dynamic random-access ,memory using 5 chips containing 134, 217, 728 bits. Each chip is internally configured as a quad-bank DRAM with a synchronous interface. Each of the chip's 33,554,432-bit banks is organized as 4,096 rows by 512 columns by 16 bits. Read and write accesses to the SDRAM are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. Accesses begin with the registration of an ACTIVE command, which is then followed by a READ or WRITE command. The address bits registered coincident with the ACTIVE command are used to select the bank and row to be accessed (BA0, BA1 select the bank; A0-11 select the row). The address bits registered coincident with the READ or WRITE command are used to select the starting column location for the burst access. The SDRAM provides for programmable READ or WRITE burst lengths of 1, 2, 4 or 8 locations, or the full page, with a burst terminate option. An AUTO PRECHARGE function may be enabled to provide a self-timed row precharge that is initiated at the end of the burst sequence. 7 The 64MB SDRAM uses an internal pipelined architecture to achieve high-speed operation. This architecture is compatible with the 2n rule of prefetch architectures, but it also allows the column address to be changed on every clock cycle to achieve a high-speed, fully random access. Precharging one bank while accessing one of the other three banks will hide the precharge cycles and provide seamless, high-speed, random-access operation. The 64MB SDRAM is designed to operate in 3.3V, lowpower memory systems. An auto refresh mode is provided, along with a power-saving, power-down mode. All inputs and outputs are LVTTL compatible. SDRAMs offer substantial advances in DRAM operating performance, including the ability to synchronously burst data at a high data rate with automatic column-address generation, the ability to interleave between internal banks in order to hide precharge time and the capability to randomly change column addresses on each clock cycle during a burst access. SDRAM FUNCTIONAL DESCRIPTION Read and write accesses to the SDRAM are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs Accesses begin with the registration of an ACTIVE command which is then followed by a READ or WRITE command. The address bits registered coincident with the ACTIVE command are used to select the bank and row to be accessed (BA0 and BA1 select the bank, A0-11 select the row). The address bits (A0-8) registered coincident with the READ or WRITE command are used to select the starting column location for the burst access. Prior to normal operation, the SDRAM must be initialized. The following sections provide detailed information covering device initialization, register definition, command descriptions and device operation. WEDPNF8M721V-XBX M6 specify the CAS latency, M7 and M8 specify the operating mode, M9 specifies the WRITE burst mode, and M10 and M11 are reserved for future use. The Mode Register must be loaded when all banks are idle, and the controller must wait the specified time before initiating the subsequent operation. Violating either of these requirements will result in unspecified operation. BURST LENGTH Read and write accesses to the SDRAM are burst oriented, with the burst length being programmable, as shown in Figure 3. The burst length determines the maximum number of column locations that can be accessed for a given READ or WRITE command. Burst lengths of 1, 2, 4 or 8 locations are available for both the sequential and the interleaved burst types, and a full-page burst is available for the sequential type. The full-page burst is used in conjunction with the BURST TERMINATE command to generate arbitrary burst lengths. Reserved states should not be used, as unknown operation or incompatibility with future versions may result. When a READ or WRITE command is issued, a block of columns equal to the burst length is effectively selected. All accesses for that burst take place within this block, meaning that the burst will wrap within the block if a boundary is reached. The block is uniquely selected by A1-8 when the burst length is set to two; by A2-8 when the burst length is set to four; and by A3-8 when the burst length is set to eight. The remaining (least significant) address bit(s) is (are) used to select the starting location within the block. Fullpage bursts wrap within the page if the boundary is reached. INITIALIZATION SDRAMs must be powered up and initialized in a predefined manner. Operational procedures other than those specified may result in undefined operation. Once power is applied to VDD and VDDQ (simultaneously) and the clock is stable (stable clock is defined as a signal cycling within timing constraints specified for the clock pin), the SDRAM requires a 100s delay prior to issuing any command other than a COMMAND INHIBIT or a NOP. Starting at some point during this 100s period and continuing at least through the end of this period, COMMAND INHIBIT or NOP commands should be applied. Once the 100s delay has been satisfied with at least one COMMAND INHIBIT or NOP command having been applied, a PRECHARGE command should be applied. All banks must be precharged, thereby placing the device in the all banks idle state. Once in the idle state, two AUTO REFRESH cycles must be performed. After the AUTO REFRESH cycles are complete, the SDRAM is ready for Mode Register programming. Because the Mode Register will power up in an unknown state, it should be loaded prior to applying any operational command. BURST TYPE Accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as the burst type and is selected via bit M3. The ordering of accesses within a burst is determined by the burst length, the burst type and the starting column address, as shown in Table 1. REGISTER DEFINITION MODE REGISTER The Mode Register is used to define the specific mode of operation of the SDRAM. This definition includes the selection of a burst length, a burst type, a CAS latency, an operating mode and a write burst mode, as shown in Figure 3. The Mode Register is programmed via the LOAD MODE REGISTER command and will retain the stored information until it is programmed again or the device loses power. Mode register bits M0-M2 specify the burst length, M3 specifies the type of burst (sequential or interleaved), M4White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 8 CAS LATENCY The CAS latency is the delay, in clock cycles, between the registration of a READ command and the availability of the first piece of output data. The latency can be set to two or three clocks. If a READ command is registered at clock edge n, and the latency is m clocks, the data will be available by clock edge White Electronic Designs FIG. 3 MODE REGISTER DEFINITION Burst Length 2 WEDPNF8M721V-XBX TABLE 1 - BURST DEFINITION Starting Column Address A0 0 1 A1 A0 0 0 0 1 1 0 1 1 A2 A1 A0 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 n = A0-9/8/7 (location 0-y) Order of Accesses Within a Burst Type = Sequential Type = Interleaved 0-1 1-0 0-1-2-3 1-2-3-0 2-3-0-1 3-0-1-2 0-1-2-3-4-5-6-7 1-2-3-4-5-6-7-0 2-3-4-5-6-7-0-1 3-4-5-6-7-0-1-2 4-5-6-7-0-1-2-3 5-6-7-0-1-2-3-4 6-7-0-1-2-3-4-5 7-0-1-2-3-4-5-6 Cn, Cn + 1, Cn + 2 Cn + 3, Cn + 4... ...Cn - 1, Cn... 0-1 1-0 0-1-2-3 1-0-3-2 2-3-0-1 3-2-1-0 0-1-2-3-4-5-6-7 1-0-3-2-5-4-7-6 2-3-0-1-6-7-4-5 3-2-1-0-7-6-5-4 4-5-6-7-0-1-2-3 5-4-7-6-1-0-3-2 6-7-4-5-2-3-0-1 7-6-5-4-3-2-1-0 Not Supported 4 8 Full Page (y) NOTES: 1. For full-page accesses: y = 512. 2. For a burst length of two, A1-8 select the block-of-two burst; A0 selects the starting column within the block. 3. For a burst length of four, A2-8 select the block-of-four burst; A0-1 select the starting column within the block. 4. For a burst length of eight, A3-8 select the block-of-eight burst; A0-2 select the starting column within the block. 5. For a full-page burst, the full row is selected and A0-8 select the starting column. 6. Whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block. 7. For a burst length of one, A0-8 select the unique column to be accessed, and Mode Register bit M3 is ignored. 9 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs FIG. 4 CAS LATENCY WEDPNF8M721V-XBX n+m. The I/Os will start driving as a result of the clock edge one cycle earlier (n + m - 1), and provided that the relevant access times are met, the data will be valid by clock edge n + m. For example, assuming that the clock cycle time is such that all relevant access times are met, if a READ command is registered at T0 and the latency is programmed to two clocks, the I/Os will start driving after T1 and the data will be valid by T2. Table 2 indicates the operating frequencies at which each CAS latency setting can be used. Reserved states should not be used as unknown operation or incompatibility with future versions may result. accesses are single-location (nonburst) accesses. COMMANDS The Truth Table provides a quick reference of available commands. This is followed by a written description of each command. Three additional Truth Tables appear following the Operation section; these tables provide current state/ next state information. TABLE 2 - CAS LATENCY ALLOWABLE OPERATING FREQUENCY (MHZ) SPEED -100 -125 CAS LATENCY = 2 75 100 CAS LATENCY = 3 100 125 OPERATING MODE The normal operating mode is selected by setting M7and M8 to zero; the other combinations of values for M7 and M8 are reserved for future use and/or test modes. The programmed burst length applies to both READ and WRITE bursts. Test modes and reserved states should not be used because unknown operation or incompatibility with future versions may result. COMMAND INHIBIT The COMMAND INHIBIT function prevents new commands from being executed by the SDRAM, regardless of whether the CLK signal is enabled. The SDRAM is effectively deselected. Operations already in progress are not affected. WRITE BURST MODE When M9 = 0, the burst length programmed via M0-M2 applies to both READ and WRITE bursts; when M9 = 1, the programmed burst length applies to READ bursts, but write White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 10 NO OPERATION (NOP) The NO OPERATION (NOP) command is used to perform a NOP to an SDRAM which is selected (CS is LOW). This pre- White Electronic Designs NAME (FUNCTION) COMMAND INHIBIT (NOP) NO OPERATION (NOP) ACTIVE (Select bank and activate row) ( 3) READ (Select bank and column, and start READ burst) (4) WRITE (Select bank and column, and start WRITE burst) (4) BURST TERMINATE PRECHARGE (Deactivate row in bank or banks) ( 5) AUTO REFRESH or SELF REFRESH (Enter self refresh mode) (6, 7) LOAD MODE REGISTER (2) Write Enable/Output Enable (8) Write Inhibit/Output High-Z (8) CS H L L L L L L L L - - RAS X H L H H H L L L - - CAS X H H L L H H L L - - WEDPNF8M721V-XBX TABLE 3 TRUTH TABLE - COMMANDS AND DQM OPERATION (NOTE 1) WE X H H H L L L H L - - DQM X X X L/H 8 L/H 8 X X X X L H ADDR X X Bank/Row Bank/Col Bank/Col X Code X Op-Code - - I/Os X X X X Valid Active X X X Active High-Z NOTES: 1. CKE is HIGH for all commands shown except SELF REFRESH. 2. A0-11 define the op-code written to the Mode Register. 3. A0-11 provide row address, and BA0, BA1 determine which bank is made active. 4. A0-8 provide column address; A10 HIGH enables the auto precharge feature (nonpersistent), while A10 LOW disables the auto precharge feature; BA0, BA1 determine which bank is being read from or written to. 5. A10 LOW: BA0, BA1 determine the bank being precharged. A10 HIGH: All banks precharged and BA0, BA1 are "Don't Care." 6. This command is AUTO REFRESH if CKE is HIGH; SELF REFRESH if CKE is LOW. 7. Internal refresh counter controls row addressing; all inputs and I/Os are "Don't Care" except for CKE. 8. Activates or deactivates the I/Os during WRITEs (zero-clock delay) and READs (two-clock delay). vents unwanted commands from being registered during idle or wait states. Operations already in progress are not affected. LOAD MODE REGISTER The Mode Register is loaded via inputs A0-11. See Mode Register heading in the Register Definition section. The LOAD MODE REGISTER command can only be issued when all banks are idle, and a subsequent executable command cannot be issued until tMRD is met. mines whether or not AUTO PRECHARGE is used. If AUTO PRECHARGE is selected, the row being accessed will be precharged at the end of the READ burst; if AUTO PRECHARGE is not selected, the row will remain open for subsequent accesses. Read data appears on the I/Os subject to the logic level on the DQM inputs two clocks earlier. If a given DQM signal was registered HIGH, the corresponding I/Os will be High-Z two clocks later; if the DQM signal was registered LOW, the I/Os will provide valid data. WRITE The WRITE command is used to initiate a burst write access to an active row. The value on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-8 selects the starting column location. The value on input A10 determines whether or not AUTO PRECHARGE is used. If AUTO PRECHARGE is selected, the row being accessed will be precharged at the end of the WRITE burst; if AUTO PRECHARGE is not selected, the row will remain open for subsequent accesses. Input data appearing on the I/Os is written to the memory array subject to the DQM input logic level appearing coincident with the data. If a given DQM signal is registered LOW, the corresponding data will be written to memory; if the DQM signal is registered HIGH, the corresponding data inputs will be ignored, and a WRITE will not be executed to that byte/column location. ACTIVE The ACTIVE command is used to open (or activate) a row in a particular bank for a subsequent access. The value on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-11 selects the row. This row remains active (or open) for accesses until a PRECHARGE command is issued to that bank. A PRECHARGE command must be issued before opening a different row in the same bank. READ The READ command is used to initiate a burst read access to an active row. The value on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-8 selects the starting column location. The value on input A10 deter- 11 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs PRECHARGE The PRECHARGE command is used to deactivate the open row in a particular bank or the open row in all banks. The bank(s) will be available for a subsequent row access a specified time (tRP) after the PRECHARGE command is issued. Input A10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs BA0, BA1 select the bank. Otherwise BA0, BA1 are treated as "Don't Care." Once a bank has been precharged, it is in the idle state and must be activated prior to any READ or WRITE commands being issued to that bank. WEDPNF8M721V-XBX refresh requirement and ensure that each row is refreshed. Alternatively, 4,096 AUTO REFRESH commands can be issued in a burst at the minimum cycle rate (tRC), once every refresh period (tREF). SELF REFRESH* The SELF REFRESH command can be used to retain data in the SDRAM, even if the rest of the system is powered down. When in the self refresh mode, the SDRAM retains data without external clocking. The SELF REFRESH command is initiated like an AUTO REFRESH command except CKE is disabled (LOW). Once the SELF REFRESH command is registered, all the inputs to the SDRAM become "Don't Care," with the exception of CKE, which must remain LOW. Once self refresh mode is engaged, the SDRAM provides its own internal clocking, causing it to perform its own AUTO REFRESH cycles. The SDRAM must remain in self refresh mode for a minimum period equal to tRAS and may remain in self refresh mode for an indefinite period beyond that. The procedure for exiting self refresh requires a sequence of commands. First, CLK must be stable (stable clock is defined as a signal cycling within timing constraints specified for the clock pin) prior to CKE going back HIGH. Once CKE is HIGH, the SDRAM must have NOP commands issued (a minimum of two clocks) for tXSR, because time is required for the completion of any internal refresh in progress. Upon exiting the self refresh mode, AUTO REFRESH commands must be issued as both SELF REFRESH and AUTO REFRESH utilize the row refresh counter. *Self refresh available in commercial and industrial temperatures only. AUTO PRECHARGE AUTO PRECHARGE is a feature which performs the same individual-bank PRECHARGE function described above, without requiring an explicit command. This is accomplished by using A10 to enable AUTO PRECHARGE in conjunction with a specific READ or WRITE command. A precharge of the bank/row that is addressed with the READ or WRITE command is automatically performed upon completion of the READ or WRITE burst, except in the full-page burst mode, where AUTO PRECHARGE does not apply. AUTO PRECHARGE is nonpersistent in that it is either enabled or disabled for each individual READ or WRITE command. AUTO PRECHARGE ensures that the precharge is initiated at the earliest valid stage within a burst. The user must not issue another command to the same bank until the precharge time (tRP) is completed. This is determined as if an explicit PRECHARGE command was issued at the earliest possible time. BURST TERMINATE The BURST TERMINATE command is used to truncate either fixed-length or full-page bursts. The most recently registered READ or WRITE command prior to the BURST TERMINATE command will be truncated. FLASH DESCRIPTION The 8Mbit 3.3 volt-only Flash memory is organized as 1,048,576 bytes. The byte-wide (x8) data appears on FD07; the word-wide (x16) data appears on FD0-15. This device requires only a single 3.3 volt Vcc supply to perform read, program, and erase operations. A standard EPROM programmer can also be used to program and erase the device. This device features unlock bypass programming and insystem sector protection/unprotection. This device offers access times of 100, 120 and 150ns, allowing operation without wait states. To eliminate bus contention the device has separate chip select (FCS), wite enable (FWE) and output enable (FOE) controls. The device requires only a single 3.3 volt power supply for 12 AUTO REFRESH AUTO REFRESH is used during normal operation of the SDRAM and is analagous to CAS-BEFORE-RAS (CBR) REFRESH in conventional DRAMs. This command is nonpersistent, so it must be issued each time a refresh is required. The addressing is generated by the internal refresh controller. This makes the address bits "Don't Care" during an AUTO REFRESH command. Each 128Mb SDRAM requires 4,096 AUTO REFRESH cycles every refresh period (tREF). Providing a distributed AUTO REFRESH command will meet the White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 White Electronic Designs WEDPNF8M721V-XBX SDRAM ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CHARACTERISTICS (NOTES 1, 2, 3, 4, 5) Parameter CL = 3 CL = 2 Symbol Min Access time from CLK (pos. edge) Address hold time Address setup time CLK high-level width CLK low-level width Clock cycle time (6) CKE hold time CKE setup time CS, RAS, CAS, WE, DQM hold time CS, RAS, CAS, WE, DQM setup time Data-in hold time Data-in setup time Data-out high-impedance time Data-out low-impedance time Data-out hold time (load) Data-out hold time (no load) (8) ACTIVE to PRECHARGE command ACTIVE to ACTIVE command period ACTIVE to READ or WRITE delay Refresh period (4,096 rows) - Commercial, Industrial Refresh period (4,096 rows) - Military AUTO REFRESH period PRECHARGE command period ACTIVE bank A to ACTIVE bank B command Transition time (9) WRITE recovery time Exit SELF REFRESH to ACTIVE command (10) (11) CL = 3 (7) CL = 2 (7) CL = 3 CL = 2 tAC tAC tAH tAS tCH tCL tCK tCK tCKH tCKS tCMH tCMS tDH tDS tHZ tHZ tLZ tOH tOHN tRAS tRC tRCD tREF tREF tRFC tRP tRRD tT tWR tXSR 70 20 15 0.3 1 CLK + 7ns 15 80 1.2 1 3 1.8 50 70 20 64 16 70 20 16 0.3 1 CLK + 7ns 15 78 1.2 120,000 1 2 3 3 10 13 1 2 1 2 1 2 7 7 1 3 1.8 45 68 20 64 16 120,000 -100 Max 7 7 1 2 3 3 8 10 1 2 1 2 1 2 6 6 Min -125 Max 6 6 ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ms ms ns ns ns ns -- ns ns Unit NOTES: 1. The minimum specifications are used only to indicate cycle time at which proper operation over the full temperature range is ensured. 2. An initial pause of 100ms is required after power-up, followed by two AUTO REFRESH commands, before proper device operation is ensured. (VCC must be powered up simultaneously.) The two AUTO REFRESH command wake-ups should be repeated any time the tREF refresh requirement is exceeded. 3. In addition to meeting the transition rate specification, the clock and CKE must transit between VIH and VIL (or between VIL and VIH) in a monotonic manner. 4. Outputs measured at 1.5V with equivalent load: 5. AC timing and ICC tests have VIL = 0V and VIH = 3V, with timing referenced to 1.5V crossover point. 6. The clock frequency must remain constant (stable clock is defined as a signal cycling within timing constraints specified for the clock pin) during access or precharge states (READ, WRITE, including tWR, and PRECHARGE commands). CKE may be used to reduce the data rate. 7. tHZ defines the time at which the output achieves the open circuit condition; it is not a reference to VOH or VOL. The last valid data element will meet tOH before going High-Z. 8. Guaranteed by design, but not tested. 9. AC characteristics assume tT = 1ns. 10. Auto precharge mode only. The precharge timing budget (tRP) begins 7.5ns/ 7ns after the first clock delay, after the last WRITE is executed. 11. Precharge mode only. 13 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs Parameter/Condition READ/WRITE command to READ/WRITE command (10) CKE to clock disable or power-down entry mode (7) CKE to clock enable or power-down exit setup mode (7) DQM to input data delay (10) DQM to data mask during WRITEs DQM to data high-impedance during READs WRITE command to input data delay (10) Data-in to ACTIVE command (8) Data-in to PRECHARGE command (9) Last data-in to burst STOP command (10) Last data-in to new READ/WRITE command (10) Last data-in to PRECHARGE command (9) LOAD MODE REGISTER command to ACTIVE or REFRESH command (11) Data-out to high-impedance from PRECHARGE command (10) CL = 3 CL = 2 Symbol tCCD tCKED tPED tDQD tDQM tDQZ tDWD tDAL tDPL tBDL tCDL tRDL tMRD tROH tROH WEDPNF8M721V-XBX SDRAM AC FUNCTIONAL CHARACTERISTICS (NOTES 1,2,3,4,5,6) -100 1 1 1 0 0 2 0 4 2 1 1 2 2 3 2 -125 1 1 1 0 0 2 0 5 2 1 1 2 2 3 -- Units tCK tCK tCK tCK tCK tCK tCK tCK tCK tCK tCK tCK tCK tCK tCK NOTES: 1. The minimum specifications are used only to indicate cycle time at which proper operation over the full temperature range is ensured. 2. An initial pause of 100ms is required after power-up, followed by two AUTO REFRESH commands, before proper device operation is ensured. (VCC must be powered up simultaneously.) The two AUTO REFRESH command wake-ups should be repeated any time the tREF refresh requirement is exceeded. 3. AC characteristics assume tT = 1ns. 4. In addition to meeting the transition rate specification, the clock and CKE must transit between VIH and VIL (or between VIL and VIH) in a monotonic manner. 5. Outputs measured at 1.5V with equivalent load: 6. AC timing and ICC tests have VIL = 0V and VIH = 3V, with timing referenced to 1.5V crossover point. 7. Timing actually specified by tCKS; clock(s) specified as a reference only at minimum cycle rate. 8. Timing actually specified by tWR plus tRP; clock(s) specified as a reference only at minimum cycle rate. 9. Timing actually specified by tWR. 10. Required clocks are specified by JEDEC functionality and are not dependent on any timing parameter. 11. JEDEC and PC100 specify three clocks. White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 14 White Electronic Designs both read and write functions. Internally generated and regulated voltages are provided for the program and erase operations. The device is entirely command set compatible with the JEDEC Single-Power-Supply Flash Standard. Commands are written to the command register using standard microprocessor write timings. Register contents serve as input to an internal state-machine that controls the erase and program circuitry. Write cycles also internally latch addresses and data needed for the programming circuitry. Write cycles also internally latch addresses abd data needed for the programming and erase operations. Reading data out of the device is similar to reading from other Flash or EPROM devices. Device programming occurs by executing the program command sequence. This initiates the Embedded Program algorithm - an internal algorithm that automatically times the program pulse widths and verifies proper cell margin. The Unlock Bypass mode faciclitates faster programming times by requiring only two write cycles to program data instead of four. Device erasure occurs by executing the erase command sequence. This initiates the Embedded Erase algorithm - an internal algorithm that automaticaally preprograms the array (if it is not already programmed) before executing the erase operation. During erase, the device automatically times the erase pulse widths and verifies proper cell margin. The host system can detect whether as program or erase operation is complete by observing the RY/BY1 pin, or by reading FD7 (Data Polling) and FD6 (toggle) status bits. After a program or erase cycle has been completed, the device is ready to read array data or accept another command. The Sector Erase Architecture allows memory sectors to be erased and reprogrammed without affecting the data contents of other sectords. The device is fully erased when shipped from the factory. Hardware Data Protection measures include a low Vcc detector that automatically inhibits write operations during power transitions. The Hardware Sector Protection feature disables bith program and erase operations in any combination of sectors of memory. This can be achieved in-system or via programming equipment. The Hardware Sector Protection feature disables both program and erase operations in any combination of sectors of memory. This can be achieved in-system or via programming equipment. The Erase Suspend feature enables the user to put erase on hold for any period of time to read data from, or proThe 15 WEDPNF8M721V-XBX gram data to, any sector that is not selected for erasure. True background erase can thus be achieved. The Hardware Rest (RST) pin terminates any operation in progress and resets the internal state machine to reading array data. The RST pin may be tied to the reset circuitry. A system reset would thus also reset the device, enabling the system microprocessor to read the boot-up firmware from Flash memory. The device offers two power saving features. When addresses have been stable for specified amount of time, the device enters the automatic sleep mode. The system can also place the device into the standby mode. Power consumption is greatly reduced in both these modes DEVICE BUS OPERATIONS This section describes the requirements and use of the device bus operations, which are initiated through the internal command register. The command register itself does not occupy any addressable memory location. The register is composed of latches that store the commands, along with the address and data information needed to execute the command. The contents of the register serve as inputs to the internal state machine. The state machine outputs dictate the function of the device. Table 4 lists the device bus operations, the inputs and control levels required, and the resulting output. The following subsections describe each of these operations in further detail. WORD/BYTE CONFIGURATION The BYTE1 pin controls whether the device data I/O pins FDO-15 operate in the byte or word configuration. If the BYTE1 pin is set at logic `1', the device is in word configuration, FD0-15 are active and controlled by FCS and FOE. If the BYTE1 pin is set at logic `0', the device is in byte configuration, and only data I/O pins FD0-7 are active and controlled by FCS and FOE. The data I/O pins FD8-14 are tri stated, and the FD15 pin is used as an input for the LSB (FA1) address function. REQUIREMENTS FOR READING ARRAY DATA To read array data from the outputs, the system must drive the FCS and FOE pins to VIL. FCS is the power control and selects the device. FOE is the output control and gates array data to the output pins. FWE should remain at VIH. The BYTE1 pin determines whether the device outputs array data in words or bytes. White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs TABLE 4 - DEVICE BUS OPERATIONS WEDPNF8M721V-XBX D8-15 F D8-15 Operation FCS FOE FWE RST Addresses (2) D0-7 F D0-7 BYTE1 = VI H Read Write Standby Output Disable Reset Sector Protect (1) L L Vcc 0.3V L X L L H X H X H H L X H X L H H Vcc 0.3V H L VID FAIN FAIN X X X Sector Address, FA6 = L, FA1 = H, FA0 = L Sector Address, FA6 = H, FA1 = H, FA0 = L AIN FDOUT FDOUT High Z High Z High Z FDIN FDOUT FDOUT High Z High Z High Z X BYTE1 = VIL FD8-14 = High Z FD15 = FA-1 High Z High Z High Z X Sector Unprotect (1) Temporary Sector Unprotect L X H X L X VID VID FDIN FDIN X FDIN X High Z LEGEND: L = Logic Low = VIL X = Don't Care FDOUT = Flash Data Out H = Logic High = VIH FAIN = Flash Address In VID = 12.0 0.5V FDIN = Flash Data In NOTES: 1. The sector protect and sector unprotect functions may also be implemented via programming equipment. See the "Sector Protection/Unprotection" section. 2. Addresses are FA18: FA0 in word mode (BYTE1 = VIH), FA18: FA-1 in byte mode (BYTE1 = VIL) The internal state machine is set for reading array data upon device power-up, or after a hardware reset. This ensures that not spurious alteration of the memory content occurs during the power transition. No command is necessary in this mode to obtain array data. Standard microprocessor read cycles that assert valid addresses on the device data outputs. The device remains enabled for read access until the command register contents are altered. See "Reading Array Data" for more information. Refer to the Flash AC Read-only Operations table for timing specifications and to Figure 11 for the timing diagram. IFCC1 in the ICC Specifications and Conditions table represents the active current specification for reading array data. Bypass mode, only two write cycles are required to program a byte, instead of four. An erase operation can erase one sector, multiple sectors, or the entire device. Table 5 indicates the address space that each sector occupies. A "sector address" consists of the address bits required to uniquely select a sector. The "Flash Command Definitions" section has details on erasing a sector or the entire chip, or suspending/resuming the erase operation. After the system writes the autoselect command sequence, the device enters the autoselect mode. The system can then read autoselect codes from the internal register (which is separate from the memory array) on FD7-0. Standard read cycle timings apply in this mode. Refer to the "Autoselect Mode" and "Autoselect Command Sequence" sections for more information. IFCC2 in the DC Characteristics table represents the active current specifications for the write mode. The "Flash AC Characteristics" section contains timing specification tables and timing diagrams for write operations. WRITE COMMANDS/COMMAND SEQUENCES To writes a command or command sequence (which includes programming data to the device and erasing sectors of memory), the system must drive FWE and FCS to VIL, and FOE to VIH. For program operations, the BYTE1 pin determines whether the device accepts program data in bytes or words. Refer to "Word/Byte Configuration" for more information. The device features an Unlock Bypass mode to facilitate faster programming. Once the device enters the Unlock White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 16 PROGRAM AND ERASE OPERATION STATUS During an erase or program operation, the system may check the status of the operation by reading the status bits on FD7- White Electronic Designs 0. Standard read cycle timings and IFCC read specifications apply. Refer to "Write Operation Status" for more information, and to "Flash AC Characteristics" for timing diagrams. WEDPNF8M721V-XBX AUTOMATIC SLEEP MODE The automatic sleep mode minimizes Flash device energy consumption. The device automatically enables this mode when addresses remain stable for t ACC + 30 ns. The automatic sleep mode is independent of the FCS, FWE, and FOE control signals. Standard address access timings provide new data when addresses are changed. While in sleep mode, output data is latched and always available to the system. Ifcc5 in the DC Characteristics table represents the automatic sleep mode current specification. STANDBY MODE When the system is not reading or writing to the device, it can place the device in standby mode. In this mode, current consumption is greatly reduced, and the outputs are placed in the high impedance state, independent of the FOE input. The device enters the CMOS standby mode when the FCS and RST pins are both held at Vcc 0.3V. (Note that this is a more restricted voltage range than VIH.) If FCS and RST are held at VIH, but not within Vcc to 0.3V the device will be in the standby mode, but the standby current will be greater. The device requires standard access time (tCE) for read access when the device is in either of these standby modes, before it is ready to read data. If the device is deselected during erasure or programming, the device draws active current until the operation is completed. In the Flash DC Characteristics table, IFCC3 and IFCC4 represent the standby current specifications. RST: HARDWARE RESET PIN The RST pin provides a hardware method of resetting the device to reading array data. When the RST pin is driven low for at least a period of tRP or greater the device immediately terminates any operation in progress, tristates all output pins, and ignores all read/write commands for the duration of the RST pulse. The device also resets the internal state machine to reading array data. The operation that was interrupted should be reinitiated once the device is ready to accept another command sequence, to ensure data integrity. Current is reduced for the duration of the RST pulse. When TABLE 5 - BOTTOM BOOT BLOCK SECTOR ADDRESS TABLE Sector SA0 SA1 SA2 SA3 SA4 SA5 SA6 SA7 SA8 SA9 SA10 SA11 SA12 SA13 SA14 SA15 SA16 SA17 SA18 A18 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 A17 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 A16 0 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 A15 0 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 A14 0 0 0 1 X X X X X X X X X X X X X X X 17 A13 0 1 1 X X X X X X X X X X X X X X X X A12 X 0 1 X X X X X X X X X X X X X X X X Sector Size (Kbytes) 16 8 8 32 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 (x8) Address Range (In hexidecimal) 00000h-03FFFh 04000h-05FFFh 06000h-07FFFh 08000h-0FFFFh 10000h-1FFFFh 20000h-2FFFFh 30000h-3FFFFh 40000h-4FFFFh 50000h-5FFFFh 60000h-6FFFFh 70000h-7FFFFh 80000h-8FFFFh 90000h-9FFFFh A0000h-AFFFFh B0000h-BFFFFh C0000h-CFFFFh D0000h-DFFFFh E0000h-EFFFFh F0000h-FFFFFh White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs RST is held at Vss 0.3V, the device draws CMOS standby current (IFCC4). If RST is held at VIL but not within Vss 0.3V, the standby current will be greater. The RST pin may be tied to the system reset circuitry. A system reset would thus also reset the Flash memory, enabling the system to read the boot-up firmware from the Flash memory. If RST is asserted during a program or erase operation, RY/ BY1 pin remains "0" (busy) until the internal reset operation is complete, which requires a time of tREADY (during Embedded Algorithms). The system can thus monitor RY/BY1 to determine whether the reset operationis complete. If RST is asserted when a program or erase operation is not executing (RY/BY1 pin is "1"), the reset operation is completed within a time of tREADY (not during Embedded Algorithms). The system can read data tRH after the RST pin returns to VIH. Refer to the Flash AC Characteristics and hardware reset tables for RST parameters and to Figure 19 for the timing diagram. WEDPNF8M721V-XBX SECTOR PROTECTION/ UNPROTECTION The hardware sector protection feature disables both program and erase operations in any sector. The hardware sector unprotection feature re-enables both program and erase operations in previously protected sectors. The device is shipped with all sectors unprotected. It is possible to determine whether a sector is protected or unprotected. See "Autoselect Mode" for details. This operation requires VID on the RST pin only, and can be implemented either in-system or via programming equipment. Figure 5 shows the algorithms and the timing diagram is shown in figure 18. This method uses standard microprocessor bus cycle timing. For sector unprotect, all unprotected sectors must first be protected prior to the first sector unprotect write cycle. TEMPORARY SECTOR UNPROTECT This feature allows temporary unprotection of previously protected sector groups to change data-in system. The Sector Unprotect mode is activated by setting the RST pin to VID. During this mode, formerly protected sector can be programmed or erased by selecting the sector addresses. Once VID is removed from the RST pin, all the previously protected sector groups will be protected again. Figure 16 shows the algorithm and the timing diagram is shown in Figure 17, for this feature. AUTOSELECT MODE The autoselect mode provides sector protection verification, through identifier codes input codes output on FD70. This mode is primarily intended for programming equipment to automatically match a device to be programmed with its corresponding programming algorithm. However, the autoselect codes can also be accessed in-system through the command register. When using programming equipment, the autoselect mode requires VID (11.5V to 12.5V) on address in FA9. Address pins FA6, FA1, and FA0 must be as shown in Table 6. In addition, when verifying sector protection, the sector address must appear on the appropriate highest order address bits (see Table 5). Table 6 shows the remaining address bits that are "don't care." When all necessary bits have been set as required, the programming equipment may then read the corresponding identifier code on FD7-0. To access the autoselect codes in-system, the host system can issue the autoselect command via the command register, as shown in Table 7. This method does not require VID. See "Command Definitions" for details on using the autoselect mode. HARDWARE DATA PROTECTION The command sequence requirement of unlock cycles for programming or erasing provides data protection against inadvertent writes (refer to Table 7 for command definitions). In addition, the following hardware data protection measures prevent accidental erasure or programming, which might otherwise be caused by spurious system level signals during Vcc power-up and power-down transitions, or from system noise. LOW VCC WRITE INHIBIT When Vcc is less than VLKO, the device does not accept any write cycles. Ths protects data during Vcc power-up and TABLE 6 - AUTOSELECT CODES (HIGH VOLTAGE METHOD) Description Sector Protection Verificaton FCS L FOE L FWE H FA18 18FA11 11FA18-12 FA11- 10 SA X FA9 FA9 VID FA8 FA8-7 X FA6 FA6 L FA5 FA5- 2 X FA1 FA1 H FA0 FA0 L FD7 FD7-0 01h (protected) 00h (unprotected) L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don't Care White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 18 White Electronic Designs FIG. 5 SECTOR PROTECT/UNPROTECT ALGORITHMS WEDPNF8M721V-XBX SECTOR PROTECT ALGORITHM SECTOR UNPROTECT ALGORITHM 19 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs power-down. The command register and all internal program/ erase circuits are disabled, and the device resets. Subsequent writes are ignored until Vcc is greater than VLKO. The system must provide the proper signals to the control pins to prevent unintentional writes when Vcc is greater than VLKO. WEDPNF8M721V-XBX device for reading array data if FD5 goes high, or while in the autoselect mode. See the "Reset Command" section, next. See also "Requirements for Reading Array Data" on the "Bus Operations" section for more information. The Data Sheet Read Operations table provides the read parameters, and the Read Operations Timing Diagram shows the timing diagram. WRITE PULSE "GLITCH" PROTECTION Noise pulses of less than 5ns (typical) on FOE, FCS, or FWE do not initiate a write cycle. RESET COMMAND Writing the reset command to the device resets the device to reading array data. Address bits are "don't care" for this command. The reset command may be written between the sequence cycles in an erase command sequence before erasing begins. This resets the device to reading array data. Once erasure begins, however, the device ignores reset commands until the operation is complete. The reset command may be written between the sequence cycles in a program command sequence before programming begins. This resets the device to reading array data (also applies to programming in Erase Suspend mode). Once programming begins, however, the device ignores reset commands until the operation is complete. The reset command may be written between the sequence cycles in an autoselect command sequence. Once in autoselect mode, the reset command must be written to return to reading array data (also applies to autoselect during Erase Suspend mode). If FD5 goes high during a program or erase operation, writing the reset command returns the device to reading array data (also applies during Erase Suspend). LOGICAL INHIBIT Write cycles are inhibited by holding any one of FOE = VIL, FCS = VIH or FWE = VIH. To initiate a write cycle, FCS and FWE must be a logical zero while FOE is a logical one. POWER-UP WRITE INHIBIT If FWE = FCS = VIL and FOE = VIH during power up, the device does not accept commands on the rising edge of FWE. The internal state machine is automatically reset to reading array data on power-up. FLASH COMMAND DEFINITIONS Writing specific address and data commands or sequences into the command register initiates device operations. Table 7 defines the valid register command sequences. Writing incorrect incor rect address and data values or writing them in improper sequence will reset the device to the read rray data. a r ray data All addresses are latched on falling edge of FWE or FCS, whichever occurs later. All data is latched on the rising edge of FWE or FCS, whichever occurs first. Refer to the appropriate timing diagrams in the "Flash AC Characteristics" section. READ ARRAY DATA Upon initial device power-up the device defaults to read array data. No commands are required to retrieve data. The device is also ready to read array data after it has completed an Embedded Program or Embedded Erase algorithm. After the device accepts an Erase Suspend command, the device enters the Erase Suspend mode. The system can read array data using the standard read timings, except that if it reads at an address within erase-suspend sectors, the device outputs status data. After completing a programming operation in the Erase Suspend mode, the system may once again read array data with the same exception. See "Erase Suspend/Erase Resume Commands" for more information on this mode. The system must issue the reset command to re-enable the UNLOCK BYPASS COMMAND SEQUENCE The unlock bypass feature allows the system to program bytes or words to the device faster than using the standard program command sequence. The unlock bypass command sequence is initiated by first writing two unlock cycles. This is followed by a third write cycle containing the unlock bypass command, 20h. The device then enters the unlock bypass mode. A two-cycle unlock bypass program command sequence is all that is required to program in this mode. The first cycle in this sequence contains the unlock bypass program command, A0h; the second cycle contains the program address and data. Additional data is programmed in the same manner. This mode dispenses with the initial two unlock cycles required in the standard program command sequence, resulting in fast total programming time. Table 7 shows the requirements for the com- White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 20 White Electronic Designs FIG. 6 PROGRAM OPERATION WEDPNF8M721V-XBX mand sequence. During the unlock bypass mode, only the Unlock Bypass Program and Unlock Bypass Reset commands are valid. To exit the unlock bypass mode, the system must issue the two-cycle unlock bypass reset command sequence. The first cycle must contain the data 90h; the second cycle the data 00h. Addresses are "don't care" for both cycles. The device then returns to reading array data. Figure 6 illustrates the algorithm for the program operation. See the Erase/Program Operations table in the "Flash AC Characteristics" for parameters, and to Figure 12 for timing diagrams. AUTOSELECT COMMAND SEQUENCE The autoselect command sequence allows the host system to determine whether or not a sector is protected. Table 7 shows the address and data requirements. This method is an alternative to that shown in Table 6, which is intended for PROM programmers and requires VID on address bit FA9. The autoselect command sequence is initiated by writing two unlock cycles, followed by the autoselect command. The device then enters the autoselect mode, and the system may read at any address any number of times, without initiating another command sequence. A read cycle containing a sector address (SA) and the address 02h in word mode (or 04h in byte mode) returns 02h in that sector is protected, or 00h if it is unprotected. Refer to Table 5 for valid sector addresses. The system must write the reset command to exit autoselect mode and return to reading array data. WORD/BYTE PROGRAM COMMAND SEQUENCE The system may program the device by word or byte, depending on the state of the BYTE1 pin. Programming is a four-bus-cycle operation. The program command sequence is initiated by writing two unlock write cycles, followed by the program set-up command. The program address and data are written next, which in turn initiate the Embedded Program algorithm. The system is not required to provide further controls or timing. The device automatically provides internally generated program pulses and verifies the programmed cell margin. Table 7 shows the address and data requirements for the byte program command sequence. When the Embedded program algorithm is complete, the device then returns to reading array data and addresses are no longer latched. The system can determine the status of the program operation by using FD7, FD6, or RY/BY1. See "Write Operation Status" for information on these status bits. 21 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com NOTE: See Table 7 for program command sequence. White Electronic Designs FIG. 7 ERASE OPERATION WEDPNF8M721V-XBX Any commands written to the device during the Embedded Program Algorithm are ignored. Note that a hardware reset immediately terminates the programming operation. The program command sequences should be reinitiated once the device has reset to reading array data, to ensure date integrity. Programming is allowed in any sequence and across sector boundaries. A bit cannot be programmed from a "0" back to a "1". Attempting to do so may halt the operation and set FD5 to "1", or cause the Data Polling algorithm to indicate the operation was successful. However, a succeeding read will show that the data is still "0". Only erase operations can convert a "0" to a "1". CHIP ERASE COMMAND SEQUENCE Chip erase is six bus cycle operation. The chip erase command sequence is initiated by writing two unlock cycles, followed by a setup command. Two additional unlock write cycles are then followed by the chip erase command, which in turn invokes the Embedded Erase algorithm. The device does not require the system to preprogram prior to erase. The Embedded Erase algorithm automatically programs and verifies the entire memory for an all zero data pattern prior to electrical erase. The system is not required to provide any controls or timings during these operations. Table 7 shows the address and data requirements for the chip erase command sequence. Any commands written to the chip during the Embedded Erase algorithm are ignored. Note that a hardware reset during the chip erase operation immediately terminates the operation. The Chip Erase command sequence should be re-initiated once the device has returned to reading array data, to ensure data integrity. The system can determine the status of the erase operation by using FD7, FD6, or FD2, or RY/BY1. See "Write Operation Status" for information on these status bits. When the Embedded Erase algorithm is complete, the device returns to reading array data and addresses are no longer latched. Figure 7 illustrates the algorithm for the erase operation. See the Erase/Program Operations tables in "Flash AC Characteristics" for parameters, and to Figure 13 for timings diagram. SECTOR ERASE COMMAND SEQUENCE 1. See Table 5 for erase command sequence. 2. See "FD3 : Sector Erase Timer" for more information. Sector erase is six bus cycle operation. The sector erase command sequence is initiated by writing two unlock cycles, followed by a setup command. Two additional unlock write cycles are then followed by the address of the 22 White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 White Electronic Designs sector to be erased, and the sector erase command, which in turn invokes the Embedded Erase algorithm. Table 7 shows the address and data requirements for the sector erase command sequence. The device does not require the system to preprogram the memory prior to erase. The Embedded Erase algorithm automatically programs and verifies the entire memory for an all zero data pattern prior to electrical erase. The system is not required to provide any controls or timings during these operations.After the command sequence is written, a sector erase time-out of 50s begins. During the time-out period, additional sector addresses and sector erase commands may be written. Loading the sector erase buffer may be done in any sequence, and the number of sectors may be from one sector to all sectors. The time between these additional cycles must be less than 50s, otherwise the last address and command might not be accepted, and erasure may begin. It is recommended that processor interrupts can be re-enabled after the last Sector Erase command is written. If the time between additional sector erase commands can be assumed to be less than 50s, the system need not monitor FD3. Any command other than the time-out Sector Erase or Erase Suspend during the time- out array data. period resets the device to reading ar ray data The system must rewrite the command sequence and any additional sector addresses and commands. The system can monitor FD3 to determine if the sector erase timer has timed out. See the "FD3: Sector Erase Timer " section. The time-out begins from the rising edge of the final FWE pulse in command sequence. Once the sector erase operation has begun, only the Erase Suspend command is valid. All other command is valid. All other commands are ignored. Note that a hardware reset during the sector erase operation. The Sector Erase command sequence should be reinitiated once the device has returned to reading array data, to ensure data integrity. When the Embedded Erase algorithm is complete, the device returns to reading array data and addresses are no longer latched. The system can determine the status of the erase operation by using FD7, FD6, or FD2, or RY/BY1. See "Write Operation Status" for information on these status bits. Figure 7 illustrates the algorithm for the erase operation. See the Erase/Program Operations tables in the "Flash AC Characteristics" for parameters, and to Figure 13 for timings diagram. WEDPNF8M721V-XBX ERASE SUSPEND/ERASE RESUME COMMAND SEQUENCE The Erase Suspend command allows the system to interrupt a sector erase operation and then read data from, or program data to, any sector not selected for erasure. This command is valid only during the sector erase operation, including the 50s time-out period during the sector erase command sequence. The Erase Suspend command is ignored if written during the chip erase operation or Embedded Program algorithm. Writing the Erase Suspend command during the Sector Erase time-out immediately terminates the timeout period and suspends the erase operation. Addresses are "don't cares" when writing the Erase Suspend command. When the Erase Suspend command is written during a sector erase operation, the device requires a maximum of 20s to suspend the erase operation. However, when the Erase Suspend command is written during the sector erase timeout, the device immediately terminates the time-out period and suspends the erase operation. After the erase operation has been suspended, the system can read array data from or program data to any sector not selected for erasure. (The device "erase suspends" all sectors selected for erasure.) Normal read and write timings and command definitions apply. Reading at any address within erase-suspended sectors produces status data on FD7-0. The system can use FD7, or FD6, and FD2 together, to determine if a sector is actively erasing or is erase suspended. See "Write Operation Status" for information on these status bits. After an erase-suspended program operation is complete, the system can once again read array data within non-suspended sectors. The system can determine the status of the program operation using the FD7 or FD6 status bits, just as in the standard program operation. See the "Write Operation Status" for more information. The system may also write the autoselect command sequence when the device is in the Erase Suspend mode. The device allows reading autoselect codes even at addresses within erasing sectors, since the codes are not stored in the memory array. When the device exits the autoselect mode, the device reverts to the Erase Suspend mode, and is ready for another valid operation. The system must write the Erase Resume command (address bits are "don't care") to exit the erase suspend mode and continue the sector erase operation. Further writes of the Resume command are ignored. Another Erase Suspend command can be written after the device has resumed erasing. 23 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs TABLE 7 - COMMAND DEFINITIONS Command Sequence (Note 1) Bus Write Cycles Req'd 1 1 Byte Word Byte 4 Word Byte Word Byte Word 555 AAA 555 AAA 555 XXX 90 AAA 555 AAA 555 XXX XXX 4 WEDPNF8M721V-XBX Bus Cycles (Notes 2, 3, 4, 13) First Bus Cycle Addr Data RD F0 AA 555 2AA 555 AA 2AA 555 2AA 555 2AA PA 00 555 2AA 555 2AA 55 55 AAA 555 AAA 555 80 80 AAA 555 AAA 555 AA AA 555 2AA 555 2AA 55 55 AAA 555 SA 10 30 55 555 AAA 555 AAA 555 55 AAA 555 AAA 90 90 X02 X01 (SA) X04 (SA) X02 PA 5B 225B XX00 01 XX00 XX01 PD Second Bus Cycle Addr Data Third Bus Cycle Addr Data Fourth Bus Cycle Addr Data Fifth Bus Cycle Addr Data Sixth Bus Cycle Addr Data Read (Note 5) Reset (Note 6) Device ID, Bottom Boot Block Autoselect RA XXX AAA 555 AAA Sector Protect Verify (Note 7,8) Program Unlock Bypass 4 3 2 XXX 6 6 1 1 AA AA A0 PA AA AA B0 30 55 55 PD A0 20 Unlock Bypass Program (Note 9) Unlock Bypass Reset (Note10) 2 Chip Erase Sector Erase Erase Suspended (Note 11) Erase Resume (Note 12) Byte Word Byte Word LEGEND: X = Don't Care RA = Address of the memory location to be read. RD = Data read from location RA during read operation. PA = Address of the memory location to be programmed. Addresses are latched on the falling edge of the FWE or FCS pulse, whichever occurs first. PD = Data to be programmed at location PA. Data is latched on the rising edge of FWE or FCS pulse, whichever occurs first. SA = Address of the sector to be erased. The combination of FA18-12 will uniquely select any sector. NOTES: 1. Bus operations are defined in Table 3. 2. All values are in hexadecimal. 3. Except when reading array or autoselect data, all bus cycles are write operations. 4. Address bits FA18-11 = don't care for unlock and command cycles, unless PA or SA is required. 5. No unlock or command cycles required when reading array data. 6. The Reset command is required to return to reading array data when device is in the autoselect mode, or if FD5 goes high (while the device is providing status data). 7. The fourth cycle of the autoselect command sequence is a read cycle. 8. The data is 00h for an unprotected sector and 01h for a protected sector. 9. The Unlock Bypass command is required prior to the Unlock Bypass Program command. 10. The Unlock Bypass Reset command is required to return to reading array data when the device is in the Unlock Bypass mode. 11. The system may read and program in non-erasing sectors, or enter the autoselect mode, when in the Erase Suspend mode. The Erase Suspend command is valid only during a sector erase operation. 12. The Erase Resume command is valid only during the Erase Suspend mode. 13. Data bots FD8-15 are don't cares for unlock and command cycles. White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 24 White Electronic Designs FIG. 8 DATA POLLING ALGORITHM WEDPNF8M721V-XBX WRITE OPERATION STATUS The device provides several bits to determine the status of a write operation: FD2, FD3, FD5, FD6, and FD7. Table 8 and the following subsections describe the functions of these bits. FD7, RY/BY1, and FD6 each offer a method for determining whether a program or erase operation is complete or in progress. These bits are discussed first. VA = Byte address for programming = Any of the sector addresses within the sector being erased during sector erase operation = Valid address equals any non-protected sector group address during chip erase FD7: DATA POLLING The Data Polling bit, FD7, indicates to the host system whether an Embedded Algorithm is in progress or completed, or whether the device is in Erase Suspend Data Polling valid after the rising edge of the final FWE pulse in the program or erase command sequence. During the Embedded Program algorithm, the device outputs on FD7 the complement of the datum programmed to FD7. This FD7 status also applies to programming during Erase Suspend. When the Embedded Program algorithm is complete, the device outputs the datum programmed to FD7. The system must provide the program address to read valid status information on FD7. If a program address falls within a protected sector, Data Polling on FD7 is active for approximately 1s, then the device returns to reading array data. During the Embedded Erase algorithm, Data Polling produces a "0" on FD7. When the Embedded Erase algorithm is complete, or if the device enters the Erase Suspend mode, Data Polling produces a "1" on FD7. This analogous to the complement/true datum output described for the Embedded Program algorithm: the erase function changes all the bits in a sector to "1"; prior to this, the device outputs the "complement," or "0." The system must provide an address within any of the sectors selected for erasure to read valid status information on FD7. After an erase command sequence is written, if all sectors selected for erasing are protected, Data Polling on FD7 is active for approximately 100s, then the device returns to reading array data. If not all selected sectors are protected, the Embedded Erase algorithm erases the unprotected sectors, and ignores the selected sectors that are protected. When the system detects FD7 has changed from the complement to true data, it can read valid data at FD7-0 on the following read cycles. This because FD7 may change asynchronously with FD0-6 while Flash Output Enable (FOE) is asserted low. Figure 14, Data Polling timings (During Embedded algorithms), in the "Flash AC characteristics" section illustrates this. Table 8 shows the outputs for Data Polling on FD7. Figure 8 shows the Data Polling algorithm. 25 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com 1. FD7 should be rechecked even if FD5 = 1 because FD7 may change simultaneously with FD5. White Electronic Designs RY/BY1: READY/BUSY The RY/BY1 is a dedicated, open drain output pin that indicates whether an Embedded Algorithm is in progress or complete. The RY/BY1 status is valid after the rising edge of the final FWE pulse in the command sequence. Since RY/ BY1 is an open-drain output, several RY/BY1 pins can be tied together in parrallel with a pull-up resistor to Vcc. If the output is low (Busy), the device is actively erasing or programming. (This includes programming in the Erase Suspend mode.) If the output is high (Ready), the device is ready to read array data (including during the Erase Suspend mode.), or is in the standby mode. Table 8 shows the outputs for RY/BY1. Figures 11, 12, 13, 19 show RY/BY1 for read, program, erase and reset operations, respectively. WEDPNF8M721V-XBX FD6 also toggles during erase-suspend-program mode, and stops toggling once the Embedded Program algorithm is complete. Table 8 shows the outputs for "Toggle Bit I" on FD6. Figure 9 shows the Toggle Bit Algorithm. Figure 21 shows the toggle bit timing diagrams. Figure 20 shows the difference between FD2 and FD6 in graphical form. See also the subsection on "FD2: Toggle Bit II". FD2: TOGGLE BIT II The "Toggle Bit II" on FD2, when used with FD6, indicates whether a particular sector is actively erasing (that is, the Embedded Erase Algorithm is in progress) or whether that sector is erase-suspended. "Toggle Bit II" is valid after the rising edge of the final FWE pulse in the command sequence. FD2 toggles when the system reads at addresses within those sectors that have been selected for erasure. (The system may use either FOE or FCS to control the read cycles.) FD2 cannot distinguish whether the sector is actively erasing or is erase-suspended. FD6, by comparison, indicates whether the device is actively erasing, or is in Erase Suspend, but cannot distinguish which sectors are selected for erasure. Thus, both status bits are required for sector and mode information. Refer to Table 8 to compare outputs for FD2 and FD6. Figure 9 shows the Toggle Bit Algorithm in flowchart form, and the section "FD2: Toggle Bit II" explains the algorithm. See also the subsection on "FD6: Toggle Bit I". Figure 21 shows the toggle bit timing diagrams. Figure 20 shows the difference between FD2 and FD6 in graphical form. FD6: TOGGLE BIT I "Toggle Bit I" on FD6 indicates whether an Embedded Program or Erase Algorithm is in progress or has been completed, or whether the device has entered the Erase Suspend mode. Toggle Bit I may read at any address, and is valid after the rising edge of the final FWE pulse in the command sequence (prior to the program or erase operation), and during the sector erase time-out. During an Embedded Program or Erase Algorithm operation, successive read cycles to any address will result in FD6 toggling. (The system may use either FOE or FCS to control the read cycles.) When operation is complete, FD6 stops toggling. After the erase command sequence is written, if all selectors selected for erasing are protected. FD6 toggles for approximately 100s, then returns to reading array data. If not all selected sectors are protected, the Embedded Erase Algorithm erases the unprotected sectors, and ignores the selected sectors that are protected. The system can use FD6 and FD2 together to determine whether a sector is actively erasing or is erase-suspended. When the device is actively erasing (that is, the Embedded Erase Algorithm is in progress) FD6 toggles. When the device enters the Erase Suspend mode, FD6 stops toggling. However, the system must also use FD2 to determine which sectors are erasing or erase-suspended. Alternatively, the system can use FD7 (see the subsection on "FD7: Data Polling"). If a program address falls within a protected sector, FD6 also toggles for approximately 1s after the program command sequence is written, then returns to reading array data. READING TOGGLE BITS FD6/FD2 Refer to Figure 9 for the following discussion. Whenever the system initially begins reading toggle bit status, it must read FD7-FD0 at least twice in a row to determine whether a toggle bit is toggling. Typically, the system would note and store the value of the toggle bit after the first read. After the second read, the system would compare the new value of the toggle bit with the first. If the toggle bit is not toggling, the device has completed the program or erase operation. The system can read array data on FD7-0 on the following read cycle. However, if after the initial two read cycles, the system determines that the toggle bit is still toggling, the system also should note whether the value of FD5 is high (see the section on FD5). If it is, the system should then determine again whether the toggle bit is toggling, since the toggle bit may White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 26 White Electronic Designs FIG. 9 TOGGLE BIT ALGORITHM WEDPNF8M721V-XBX have stopped toggling just as the device has successfully completed the program or erase operation. If it is still toggling, the device did not complete the operation successfully, and the system must write the reset command to return to reading array data. The remaining scenario is that the system initially determines that the toggle bit is toggling and FD5 has not gone high. The system may continue to monitor the toggle bit and FD5 through successive read cycles, determining the status as described in the previous paragraph. Alternatively, it may choose to perform other system tasks. In this case, the system must start at the beginning of the algorithm when it returns to determine the status of the operation (top of Figure 9). FD5: EXCEEDED TIMING LIMITS FD5 will indicate whether the program or erase time has exceeded the specified limits (internal pulse count). Under these conditions FD5 will produce a "1". This is a failure condition that indicates the program or erase cycle was not successfully completed. The FD5 failure condition may appear if the system tries to program a "1" to a location that is previously programmed to "0." Only an erase operation can change a "0" back to a "1." Under this condition, the device halts the operation, and when the operation has exceeded timing limits, the FD5 bit will produce a "1". Under both these conditions, the system must issue the reset command to return the device to reading array data. FD3: SECTOR ERASE TIMER After writing a sector erase command sequence, the system may read FD3 to determine whether or not an erase operation has begun. (The sector erase timer does not apply to the chip erase command.) If additional sectors are selected for erasure, the entire time-out also applies after each additional sector erase command. When the time-out is completed, FD3 switches from "0" to "1." The system may ignore FD3 if the system can guarantee that the time between additional sector erase commands will always be less than 50s. See also the "Sector Command Sequence" section. After the sector erase command sequence is written, the system should read the status on FD7 (Data Polling) or FD6 (Toggle Bit I) to ensure the device has accepted the command sequence, and then read FD3. If FD3 is high ("1") the internally controlled erase cycle has begun; all further commands (other than Erase Suspend) will be ignored until the erase operation is completed. If FD3 is low ("0"), the device 1. Read toggle bit twice to detemine whether or not it is toggling. See text. 2. Recheck toggle bit because it may stop toggling as FD5 changes to 1. See text. 27 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs will accept additional sector erase commands. To ensure the command has been accepted, the system software should check the status of FD3 prior to and following each subsequent sector erase command. If FD3 is high on the second status check, the last command may not have been accepted. Table 8 shows the outputs for FD3. WEDPNF8M721V-XBX TABLE 8 - WRITE OPERATION STATUS Status Standard Mode Erase Suspend Mode Embedded Program Algorithm Embedded Erase Algorithm Reading within Erase Suspended Sector Reading within Non-Erase Suspended Sector Erase Suspended Program FD7 FD7(2) FD7 0 1 Data FD7 FD6 FD6 Toggle Toggle No Toggle Data Toggle FD5 FD5 (1) 0 0 0 Data 0 FD3 FD3 N/A 1 N/A Data N/A FD2 FD2(2) No Toggle Toggle Toggle Data N/A RY/BY1 0 0 1 1 0 NOTES: 1. FD5 switches to "1" when an Embedded Program or Embedded Erase operation has exceeded the maximum timing limits. See "FD5: Exceed Timing Limits" for more information. 2. FD7 and FD2 require valid address when reading status information. Refer to the appropriate subsection for further details. FLASH AC CHARACTERISTICS - WRITE/ERASE/PROGRAM OPERATIONS,CS CONTROLLED (VCC = 3.3V, VSS = 0V, TA = -55C TO +125C) Parameter Write Cycle Time Write Enable Setup Time Chip Select Pulse Width Address Setup Time Data Setup Time Data Hold Time Address Hold Time Chip Select Pulse Width High Duration of Byte Programming Operation (1) Sector Erase Time Read Recovery Time (2) Chip Programming Time Symbol Min tAVAV tWLEL tELEH tAVEL tDVEH tEHDX tELAX tEHEL tWHWH1 tWHWH2 tGHEL 0 50 tWC tWS tCP tAS tDS tDH tAH tCPH 100 0 45 0 45 0 45 20 300 15 0 50 -100 Max Min 120 0 50 0 50 0 50 20 300 15 0 50 -120 Max Min 150 0 50 0 50 0 50 20 300 15 -150 Max ns ns ns ns ns ns ns ns s sec s sec Unit 1. Typical value for tWHWH1 is 9s. 2. Guaranteed by design, but not tested. White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 28 White Electronic Designs WEDPNF8M721V-XBX FLASH AC CHARACTERISTICS - WRITE/ERASE/PROGRAM OPERATIONS - WE CONTROLLED (VCC = 3.3V, TA = -55C TO +125C) Parameter Write Cycle Time Chip Select Setup Time Write Enable Pulse Width Address Setup Time Data Setup Time Data Hold Time Address Hold Time Write Enable Pulse Width High Duration of Byte Programming Operation (1) Sector Erase Read Recovery Time before Write (3) VCC Setup Time Chip Programming Time Output Enable Setup Time Output Enable Hold Time (2) tOES tOEH 0 10 Symbol tAVAV tELWL tWLWH tAVWL tDVWH tWHDX tWLAX tWHWL tWHWH1 tWHWH2 tGHWL tVCS 0 50 50 0 10 tWC tCS tWP tAS tDS tDH tAH tWPH Min 100 0 50 0 50 0 50 30 300 15 0 50 50 0 10 -100 Max Min 120 0 50 0 50 0 50 30 300 15 0 50 50 -120 Max Min 150 0 65 0 65 0 65 35 300 15 -150 Max ns ns ns ns ns ns ns ns s sec s s sec ns ns Unit 1. Typical value for tWHWH1 is 9s. 2. For Toggle and Data Polling. 3. Guaranteed by design, but not tested. FLASH AC CHARACTERISTICS - READ-ONLY OPERATIONS (VCC = 3.3V, TA = -55C TO +125C) Parameter Read Cycle Time Address Access Time Chip Select Access Time Output Enable to Output Valid Chip Select High to Output High Z (1) Output Enable High to Output High Z (1) Output Hold from Addresses, FCS or FOE Change, whichever is First 1. Guaranteed by design, not tested. Symbol Min tAVAV tAVQV tELQV tGLQV tEHQZ tGHQZ tAXQX tRC tACC tCE tOE tDF tDF tOH 0 100 100 100 40 30 30 0 -100 Max Min 120 120 120 50 30 30 0 -120 Max Min 150 150 150 55 40 40 -150 Max ns ns ns ns ns ns ns Unit FIG. 10 AC TEST CIRCUIT Parameter AC TEST CONDITIONS Typ VIL = 0, VIH = 2.5 5 1.5 Unit V ns V Input Pulse Levels Input Rise and Fall Input and Output Reference Level Output Timing Reference Level 1.5 V Notes: VZ is programmable from -2V to +7V. IOL & IOH programmable from 0 to 16mA. Tester Impedance Z0 = 75. VZ is typically the midpoint of VOH and VOL. IOL & IOH are adjusted to simulate a typical resistive load circuit. ATE tester includes jig capacitance. 29 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs FIG. 11 FLASH AC WAVEFORMS FOR READ OPERATIONS WEDPNF8M721V-XBX White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 30 White Electronic Designs FIG. 12 FLASH WRITE/ERASE/PROGRAM OPERATION, FWE CONTROLLED WEDPNF8M721V-XBX NOTES: 1. PA is the address of the memory location to be programmed. 2. PD is the data to be programmed at byte address. 3. FD7 is the output of the complement of the data written to each chip. 4. FDOUT is the output of the data written to the device. 5. Figure indicates last two bus cycles of four bus cycle sequence. 31 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs FIG. 13 FLASH AC WAVEFORMS CHIP/SECTOR ERASE OPERATIONS WEDPNF8M721V-XBX NOTE: 1. SA is the sector address for Sector Erase. White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 32 White Electronic Designs WEDPNF8M721V-XBX FIG. 14 FLASH AC WAVEFORMS FOR DATA POLLING DURING EMBEDDED ALGORITHM OPERATIONS 33 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs WEDPNF8M721V-XBX FIG. 15 FLASH ALTERNATE FCS CONTROLLED PROGRAMMING OPERATION TIMINGS Notes: 1. FPA represents the address of the memory location to be programmed. 2. PD represents the data to be programmed at byte address. 3. FD7 is the output of the complement of the data written to each chip. 4. FDOUT is the output of the data written to the device. 5. Figure indicates the last two bus cycles of a four bus cycle sequence. White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 34 White Electronic Designs FIG. 16 TEMPORARY SECTOR UNPROTECT OPERATION WEDPNF8M721V-XBX Unit TEMPORARY SECTOR UNPROTECT TIMING DIAGRAM All Speed Options Description 500 Min Vid Rise and Fall Time (See Note) FIG. 17 Parameter tVIDR 1. All protected sectors unprotected. 2. All previously protected sectors are protected once again. 35 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com tRSP RST Setup Time for Temporary Sector Unprotect Min 4 s ns White Electronic Designs WEDPNF8M721V-XBX FIG. 18 AC CHARACTERISTICS SECTOR PROTECT/UNPROTECT TIMING DIAGRAM White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 36 White Electronic Designs Parameter t Ready t Ready t RP t RH t RPD t RB Note: Not 100% tested. WEDPNF8M721V-XBX Description RST Pin Low (During Embedded Algorithms) to Read or Write (See Note) RST Pin Low ( NOT During Embedded Algorithms) to Read or Write (See Note) RST Pulse Width RST High Time Before Read (See Note) RST Low to Standby Mode RY/BY1 Recovery Time Test Setup Max Max Min Min Min Min All Speed Options Unit 20 500 500 50 20 0 s ns ns ns s ns FIG. 19 HARDWARE RESET (RST) 37 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs FIG. 20 AC CHARACTERISTICS DQ 2 VS. DQ 6 WEDPNF8M721V-XBX White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 38 White Electronic Designs FIG. 21 TOGGLE BIT TIMINGS (DURING EMBEDDED ALGORITHMS) WEDPNF8M721V-XBX 39 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs PACKAGE 743: 275 PLASTIC BALL GRID ARRAY (PBGA) BOTTOM VIEW WEDPNF8M721V-XBX ALL LINEAR DIMENSIONS ARE MILLIMETERS AND PARENTHETICALLY IN INCHES White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 40 White Electronic Designs 750 POWERPCTM SYSTEM BLOCK DIAGRAM WEDPNF8M721V-XBX 41 White Electronic Designs Corporation * (602) 437-1520 * www.whiteedc.com White Electronic Designs ORDERING INFORMATION WED P N F 8M 72 1 V - XXXX B X DEVICE GRADE: M = Military I = Industrial C = Commercial PACKAGE: WEDPNF8M721V-XBX -55C to +125C -40C to +85C 0C to +70C B = 275 Plastic Ball Grid Array (PBGA) FREQUENCY (MHz) 1010 = 100MHz SDRAM / 100ns Flash 1012 = 100MHz SDRAM / 120ns Flash 1015 = 100MHz SDRAM / 150ns Flash 1210 = 125MHz SDRAM / 100ns Flash 1212 = 125MHz SDRAM / 120ns Flash 1215 = 125MHz SDRAM / 150ns Flash 3.3V Power Supply Flash CONFIGURATION, 1M x 8/512K x 16 (1MB) SDRAM CONFIGURATION, 8M x 72 (64MB) FLASH SDRAM PLASTIC WHITE ELECTRONIC DESIGNS CORP. White Electronic Designs Corporation * Phoenix AZ * (602) 437-1520 42 |
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