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communication ics data bulletin cmx208 isdn dual telephony protocol engine mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies advance information features applications ? supports itu specifications 1 ? supports incoming and outgoing calls ? independent port configuration ? supports ctr3 approval ? full api available ? feature phones ? pay-phones ? pabx telephones ? reference designs available cmx208 iom2 bus parallel bus s/t interface am79c30 s/t bus controller + codec dtmf rx cli cmx605 a b pots 1 s l i c dtmf rx cli cmx605 a b pots 2 s l i c motorola mc145480 pcm codec the cmx208 is an isdn telephony protocol engine which implements the lower level isdn interface and communicates with the cmx605 and other standard devices to form a fully integrated isdn chipset for voice communications. the cmx208 puts all the main data processing elements in a single device. no isdn software has to be written and simple ?plug and play? design results. this reduces development time and provides a highly cost-effective hardware solution. by using proven circuit designs, the designer can move quickly from initial concept through design in to manufacture. the cmx208 supports two voice ports over the isdn line, which can be used to provide isdn telephony services or pots line interfaces, and has independent keypad-configuration of these services for each port. the cmx208?s feature set and architecture allow most analog systems to be converted to an isdn equivalent with enhanced features. the cmx208 is designed to work with the amd 79c30 s/t bus interface, the siemens psb-21525 hdlc formatter, the motorola mc145480 pcm codec and the mx-com cmx605 pots interface circuit, and also comes complete with embedded applications software. to support the cmx208, mx-com can also provide licensed reference designs on user request. a flexible applications program interface (api) allows users to customize the features and operation of their own design. the cmx208 is available in an 80-pin qfp (CMX208S1) package. 1 the cmx208 is a data processor integrated circuit that supports the protocol layers 1, 2 and 3 of the isdn protocol stack in a ccordance with the specifications of ccitt (now itu). these specifications, which are widely used around the world, might not be support ed within the u.s.
isdn dual telephony protocol engine 2 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies contents section page 1. block diagram................................................................................................................ 3 2. signal list.................................................................................................................... ... 4 3. external components.................................................................................................... 7 4. general description....................................................................................................... 8 4.1 glossary ....................................................................................................................... ........ 9 4.2 initialization ................................................................................................................. ....... 10 4.3 isdn interface................................................................................................................. ... 10 4.3.1 activation..................................................................................................................... ......... 10 4.3.2 de-activation or line disconnection..................................................................................... 10 4.3.3 line failure detection ......................................................................................................... .10 4.3.4 incoming calls................................................................................................................. ..... 10 4.3.5 multiple subscriber numbering ............................................................................................ 11 4.3.6 channel mapping ................................................................................................................ .11 4.4 pots configuration ........................................................................................................... 12 4.4.1 configuration and control via dtmf keypad....................................................................... 12 4.5 pots operation................................................................................................................. 13 4.5.1 keypad operation ............................................................................................................... .13 4.5.2 incoming pots calls ........................................................................................................... 1 3 4.5.3 outgoing pots calls ........................................................................................................... 1 3 4.5.4 connected calls ................................................................................................................ ... 14 4.5.5 call clearing.................................................................................................................. ....... 14 4.6 application programmer's interface ................................................................................... 14 4.7 hardware description......................................................................................................... 15 4.7.1 led status indicators (led1 to led9, and ilfi) ................................................................. 15 5. application notes ........................................................................................................ 16 5.1 general ........................................................................................................................ ...... 16 5.2 approvals ...................................................................................................................... ..... 16 6. performance specification.......................................................................................... 17 6.1 electrical performance ....................................................................................................... 17 6.1.1 absolute maximum ratings.................................................................................................. 17 6.1.2 operating limits ............................................................................................................... .... 17 6.1.3 operating characteristics..................................................................................................... 1 8 6.2 packaging ...................................................................................................................... .... 22 mx-com, inc. reserves the right to change specifications at any time and without notice.
isdn dual telephony protocol engine 3 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 1. block diagram isdn d-channel protocol stacks pots port 2 handler pots port 1 handler system memory and nvram led status indicator isdn interface chip auxiliary codec led status indicators slic slic cmx605 dtmf detector and caller display cmx605 dtmf detector and caller display led status indicators task scheduler, memory manager, timers and task mailing figure 1: block diagram
isdn dual telephony protocol engine 4 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 2. signal list s1 package signal pin no. name type description 1 scl output eeprom - serial clock 2 sda bi-directional eeprom - serial data 3 isdnrst output isdn s-interface chip reset 4 n/c output do not make any connection to this pin 5 n/c output do not make any connection to this pin 6 n/c output do not make any connection to this pin 7 rst input cmx208 chip reset (active low) 8 dv dd1 power the digital positive supply rail. levels and voltages are dependent upon this supply. this pin should be decoupled to dv ss by a capacitor 9 xtal output the output of the on-chip xtal oscillator inverter 10 xtal input the input to the oscillator inverter from the xtal circuit 11 dv ss1 power the digital negative supply rail (ground) 12 led1 output pots port 1 off-hook indicator (hk1) 13 led2 output pots port 2 off-hook indicator (hk2) 14 n/c output do not make any connection to this pin 15 led4 output pots port 2 call connected indicator (cn2) 16 n/c output do not make any connection to this pin 17 n/c output do not make any connection to this pin 18 n/c output do not make any connection to this pin 19 led8 output isdn line activated indicator (ar) 20 st output watchdog timer stimulus 21 led9 output pots port 1 call connected indicator (cn1) 22 wr output memory write access strobe 23 rd output memory read access strobe 24 a19 output memory and peripheral address bus 25 a18 output memory and peripheral address bus 26 a17 output memory and peripheral address bus 27 a16 output memory and peripheral address bus 28 a15 output memory and peripheral address bus 29 a14 output memory and peripheral address bus 30 a13 output memory and peripheral address bus 31 a12 output memory and peripheral address bus 32 a11 output memory and peripheral address bus 33 a10 output memory and peripheral address bus 34 a9 output memory and peripheral address bus 35 a8 output memory and peripheral address bus 36 a/d7 bi-directional memory and peripheral address and data bus 37 a/d6 bi-directional memory and peripheral address and data bus 38 a/d5 bi-directional memory and peripheral address and data bus
isdn dual telephony protocol engine 5 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies s1 package signal pin no. name type description 39 a/d4 bi-directional memory and peripheral address and data bus 40 a/d3 bi-directional memory and peripheral address and data bus 41 a/d2 bi-directional memory and peripheral address and data bus 42 a/d1 bi-directional memory and peripheral address and data bus 43 a/d0 bi-directional memory and peripheral address and data bus 44 astb output address/data bus strobe (data bus selected if low) 45 dv ss0 power the digital negative supply rail (ground) 46 ~ input for manufacturer's use only. connect to dv ss directly 47 psbres output hdlc chip reset 48 ring2 output pots port 2 ringing generator (low when not ringing) 49 2 ring output pots port 2 ringing generator (high when not ringing) 50 api-rxd input api/rs232 port rx data (inactive = high) 51 api-txd output api/rs232 port tx data (high when inactive) 52 clip2 output pots port 2 line voltage adjustment (low when sending fsk to a caller display unit. if low, it makes the slic present a high impedance to the pots line) 53 b2 b1/ output b-channel select (high selects channel b1). 54 ilfi output isdn line failure indicator 55 dv dd0 power the digital positive supply rail. levels and voltages are dependent upon this supply. this pin should be decoupled to dv ss by a capacitor 56 ring1 output pots port 1 ringing generator (low when not ringing) 57 1 ring output pots port 1 ringing generator (high when not ringing) 58 clip1 output pots port 1 line voltage adjustment (low when sending fsk to a caller display unit. if low, it makes the slic present a high impedance to the pots line) 59 iline1 input pots port 1 hook switch status detector (on-hook = low) 60 iline2 input pots port 2 hook switch status detector (on-hook = low) 61 reply input cmx605 c-bus interface - reply data 62 cmd- data output cmx605 c-bus interface - command data 63 ser-clk output cmx605 c-bus interface - serial clock 64 av dd power the positive analog supply rail. levels and voltages are dependent upon this supply. this pin should be decoupled to av ss by a capacitor 65 av ref1 power a/d reference voltage. connect to av dd directly 66 av ss power the negative analog supply rail (ground) 67 1 cs output cmx605 c-bus interface (chip select pots port 1) 68 2 cs output cmx605 c-bus interface (chip select pots port 2) 69 av ref2 power d/a reference voltage. connect to av dd directly 70 av ref3 power d/a reference voltage. connect to av ss directly
isdn dual telephony protocol engine 6 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies s1 package signal pin no. name type description 71 nmi input for manufacturer's use only. connect to dv ss directly 72 api-int input api interrupt (inactive = high) 73 irq input cmx605 c-bus interface - interrupt (inactive = high) 74 psbint input hdlc chip interrupt 75 input for manufacturer ? s use only. connect to dv dd directly 76 input for manufacturer ? s use only. connect to dv dd directly 77 isdnint input isdn s-interface chip interrupt 78 input for manufacturer ? s use only. connect to dv dd directly 79 for manufacturer ? s use only. connect to dv dd directly 80 n/c output do not make any connection to this pin table 1: signal list
isdn dual telephony protocol engine 7 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 3. external components n/c irq a/d3 a8 led9 wr rd a19 a18 a17 a16 a14 a15 a13 a/d4 a/d7 a/d5 a11 a9 a/d6 a10 a12 clip2 ring2 n/c n/c n/c n/c sda led1 isdnrst led2 scl n/c rst led4 n/c n/c xtal n/c xtal led8 st astb a/d0 a/d1 a/d2 ring2 api-txd b1/b2 ilfi ring1 ring1 clip1 iline1 iline2 ser-clk cmd-data api-int cs1 cs2 av ss av ref1 av ref2 av ref3 dv dd1 dv ss1 dv dd0 v dd v dd v dd v dd dv ss0 (v ) ss api-rxd av dd nmi reply isdnint (v ) ss (v ) ss (v ) ss (v ) ss (v ) ss CMX208S1 v ss figure 2: cmx208 pin-out note: this product is to be used as part of a chip-set. please refer to the applications section (section 5) for details of the recommended chip-set.
isdn dual telephony protocol engine 8 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 4. general description the cmx208 is a single-chip data processor which has been mask programmed with firmware to implement an isdn protocol stack. this enables the cmx208 to interface two analog (pots) ports to an isdn s-bus network connection. key variables are stored in an external eeprom and the user can provide additional features by adding external rom and ram. access to the firmware application programmer's interface (api) facilitates the seamless integration of the user's additional features with the pre-programmed isdn to pots interfaces. the cmx208 is intended for use as part of an isdn chipset and all descriptions in this data sheet refer to this implementation, which is shown in figure 3. the use of alternative chipsets is not supported. the firmware supports connection to an isdn s-bus network interface via the siemens psb21525 hdlc controller and the amd am79c30 st controller with integral pcm codec for a single pots port. an auxiliary motorola mc145480 pcm codec will need to be added for the second pots port. the cmx208 interfaces with up to two cmx605 tone generator and dtmf receiver chips, which decode incoming dtmf tones and generate certain call progress signals (e.g. busy tone) normally originating from an analog telephone exchange. the firmware translates the cmx605 data into isdn d-channel commands and vice versa to support both incoming and outgoing calls. for the isdn interface, d-channel commands sufficient for standard telephony applications are implemented. with the aid of a small amount of discrete circuitry, exchange battery voltage, ringing current, line reversal and off-hook detection are also supported, to complete the pots interface. the cmx208 has dedicated outputs for visible indicators (leds) that can be used to provide information on the call status. support for multiple subscriber numbering is also included in the firmware. the cmx208 can be configured by means of keypad programming via either pots port. configuration parameters allow the user to change (for example) the format and cadence of the ringing signal, so as to facilitate use of the cmx208 in different countries. each pots interface is able to configure the variables relevant to its own use. an application programmer's interface (api) is available and is described separately in section 4.6. further details are available on completion of a non-disclosure agreement. please contact mx-com directly for further details. the firmware and finite state machine embedded in the cmx208 have been used in products that have gained etsi ctr3 approval.
isdn dual telephony protocol engine 9 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 4.1 glossary accm asynchronous control character map api application programmer ? s interface cidcw caller identification during call waiting cli calling line identification crc cyclic redundancy check cts clear to send dcd data carrier detect ddi direct dialing inwards dte data terminal equipment dtmf dual tone multiple frequency dtr data terminal ready hdlc high level data link control ia5 international alphabet no 5 ie information element ilfi isdn line failure indicator isdn integrated services digital network lapb link access procedure ? balanced lapd link access procedure on the d-channel lcgn logical channel group number led light emitting diode lli logical link identifier mfo multiple frame operation msn multiple subscriber numbering nua network user address nui network user identification pad packet assembler/disassembler pc personal computer pcm pulse code modulation pots plain old (analog) telephone service ppp point to point protocol pvc permanent virtual circuit ri ring indication rnr receiver not ready rr receiver ready rts ready to send sabm set asynchronous balanced mode sabme set asynchronous balanced mode extended slic subscriber line interface circuit spm subscriber pulse metering svc switched virtual circuit tei terminal endpoint identifier
isdn dual telephony protocol engine 10 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 4.2 initialization on power-up, the cmx208 assumes its default values, which are factory programmed into the firmware. it then performs a self-test, during which all of the led pins and the ilfi pin are held high for 3 seconds. if the test is unsuccessful, the cmx208 remains in this condition. if the test is successful, the cmx208 reads its preset values from the attached eeprom and examines the state of the isdn link (i.e. layer 1) before commencing normal operation. on power-up, the isdn link is de- activated; the pots ports are assumed to be on-hook and ringing is disabled. 4.3 isdn interface two simultaneous voice calls are possible. incoming calls are firstly checked for other calls present, then the msn is checked for validity, then the channel mapping, so that responses will be handled accordingly. when channel mapping is enabled, outgoing calls will request the channel enabled. when not enabled, a request for any channel is made. if no free channels are available for outgoing calls, a locally generated busy tone is returned to the analog port. 4.3.1 activation activation occurs in the following circumstances: ? the isdn network activates. ? the device connected to the analog port goes off hook. the terminal endpoint identifier (tei) is negotiated. line powering of the cmx208 is not supported. the 'ar' indicator (led8) toggles between high and low states when the cmx208 is powered up, and remains constantly low once the cmx208 identifies an activated isdn line. isdn line power detection is not implemented and the cmx208 will negotiate a new tei on any new network activation. 4.3.2 de-activation or line disconnection de-activation or line disconnection causes the tei to be removed. upon re-connection the cmx208 will only be re-activated and request a new tei when one of the conditions in the above section is met. 4.3.3 line failure detection if the line failure detection parameter is enabled (via either pots port) the cmx208 will check that layer 2 communications are active every sample period of 30 seconds. if layer 2 communications are not active, the cmx208 will attempt to activate them. if they remain inactive for 2 sample periods, the line is deemed to have failed, so then the ilfi pin is set high and ring1, 1 ring , ring2 and 2 ring pins are set low. the cmx208 continues to attempt to activate the line and if it becomes active and stays active for 2 sample periods, then the ilfi pin is set low and ring1, 1 ring , ring2 and 2 ring pins are restored to their default settings. 4.3.4 incoming calls incoming voice calls and calls from analog lines are directed to the analog ports and all other incoming calls are ignored.
isdn dual telephony protocol engine 11 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 4.3.5 multiple subscriber numbering multiple subscriber numbering (msn) enables each pots port of the cmx208 to have its own telephone number. up to 23 digits can be saved as the msn for each port. all incoming setup messages will be checked for the presence of a called party number information element (ie). if one is present it is compared with the saved msn number (if present), starting with the last digit of both numbers. comparison continues until there are no more numbers in the msn saved number or the incoming called party number or there is a difference between the numbers. the msn is said to match if the saved msn and the incoming calls ? called party number are the same for the duration of the shorter number (i.e. if the digit ? 1 ? is saved and the received called party number is 654321, then the msn matches). if there is no saved msn, the called party number is ignored and call processing continues. when there is a saved msn and the calling party number transmit is enabled, all outgoing call setup messages will contain a calling party number information element. note: 1. when a cmx208 with msn saved and calling party number transmit enabled is connected to some exchanges, no dial tone is heard when going off-hook. 2. disabling the calling party number transmit will mean that the called party may not receive the calling line identification (cli), or if they do receive a cli it will probably be the base number and not the number specific to the calling telephone. 4.3.6 channel mapping it is possible to configure the cmx208 so that the analog ports will only originate calls to and respond to calls from a specific isdn b-channel. this is a useful feature if, for example, you wish to have a hunt group on your isdn line and only want one voice port to ring on an incoming call.
isdn dual telephony protocol engine 12 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 4.4 pots configuration 4.4.1 configuration and control via dtmf keypad configuration can be carried out at any time by causing the pots port to go off-hook and then immediately entering a configuration sequence of dtmf tones. the sequence signaled to the cmx208 will determine the configuration to be performed, as shown in the following table. configuration sequence name description default 02 # test watchdog puts the cmx208 into a permanent loop, not updating the external watchdog counter, so after 2s it should reset. n/a 90 # clear msn clears any saved digits n/a 90 n # save multiple subscriber number (msn) n = msn (up to 23 digits) clear 93 # clear country code country code is set to uk by default n/a 93 n # change country code n = country code 0 = uk 1 = belgium 2 = rest of europe uk 94 # clear channel mapping incoming calls on any channel are accepted (provided other parameters are valid e.g. msn). n/a 94 n # enable channel mapping where n = 1 or 2 for the appropriate channel. no channel map 95 # disable calling party no. transmit outgoing call setup messages do not contain any calling party number information elements. n/a 95 1 # enable calling party no. transmit outgoing call setup messages contain calling party number information element with number set to saved msn (if a number is present). enabled 96 # disable ddi transmit prevents digits being transmitted to the pots port upon call connection. n/a 96 1 # enable ddi transmit upon connection of a call on pots port 1 only, if there was a called party number information element present in the incoming call setup message, the digits are sent as dtmf tones to the pots port. disabled 97 # disable line failure detection once the cmx208 is de-activated it stays de-activated until the network re-activates it or an outgoing call needs to be made. n/a 97 1 # enable line failure detection the cmx208 checks to see if the isdn line is activated and layer 2 communications can be made. it then sets the ilfi pin accordingly. disabled 9 1234567890 # initialize all configurations. resets all of the configuration variables back to their default values. n/a of the above configurations, the following are saved on a per port basis: msn channel mapping the rest are saved on a system-wide basis, the last details entered at either port being the configuration saved.
isdn dual telephony protocol engine 13 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies once the ? ? has been recognized, each digit pressed is then checked for validity as a configuration sequence. if any digit pressed is not a valid configuration digit, all digits pressed so far will be transmitted to the network in information messages as keypad information elements, until a ? # ? is entered (with the exception of ? # ? being entered, see keypad operation below). if the first four digits received are a valid configuration sequence then the configuration mode is entered. when a valid configuration has been completed the cmx208 will send a single dtmf tone to the pots port. if a valid configuration sequence is received but subsequent digits are invalid, then subsequent digits entered will be ignored and two dtmf tones will be sent to the pots port. if the port goes on-hook part way through configuration, it will cause any digits received so far to be ignored. configurations can be performed consecutively with the exception of the test function (where the attached handset must be replaced immediately after the configuration has been audibly signaled to the pots port). all configurations entered will be retained after a power-down as they are stored in the external eeprom. 4.5 pots operation 4.5.1 keypad operation the cmx208 supports isdn keypad messages for control of network supplementary services either before or during call establishment. when dialing a number (i.e. off-hook and dial tone audible on pots port), or if a call has been disconnected by the network but the pots port has not yet gone on-hook, any keypad string entered will be sent to the network as ? keypad information elements ? within information messages. keypad strings are defined as the following sequences of digits, with the exception of the configuration strings defined in the previous section: ... # # ... # # ... # when a call is connected, pressing the recall key results in all subsequent key presses being sent to the network as ? keypad information elements ? within information messages, until the handset is replaced. the tones generated by the key presses are also passed down the b-channel, so the remote user will be able to hear them. 4.5.2 incoming pots calls an incoming pots call is identified by the bearer capability information element of the setup message being set to ? speech' or ? 3.1khz audio ? . the call will be routed to either (or both) of the pots ports which satisfy the following three conditions: ? the port is on-hook. ? the msn saved for the port matches the called number in the incoming setup message, or no msn is specified for the port, or there is no called number in the setup message. see section 4.3.5 for details of pots port msn selection. ? the isdn b-channel on which the call is placed (as indicated in the setup message) is compatible with the channel mapping configuration for the port. see section 4.3.6 for details of pots port channel mapping selection. when the call is routed to a port, the ringing signal for that port will be applied by means of the ring1 and ring1 (or ring2 and 2 ring ) pins. the call is answered when either of the ports with ringing signal goes off-hook. the ringing signal is then stopped and the isdn call is connected to that port. 4.5.3 outgoing pots calls outgoing calls are initiated when a pots port goes off-hook. an isdn setup message is sent to the network with the bearer capability information element set to 'speech'. the dial tone presented by the network on that isdn b-channel which was selected by channel mapping (see section 4.3.6), will be routed to the pots port initiating the call. when dtmf tones are received from the pots port, they are sent to the network either as called party number or keypad information elements. keypad information elements are discussed in section 4.5.1.
isdn dual telephony protocol engine 14 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies receipt of a valid dtmf tone will prompt its conversion to ia5 coded digits, as shown in the following table (ia5 hex digits are in brackets). if the first valid digit to be received is a ? ? then the configuration mode is entered and subsequent digits will be monitored and saved as indicated in section 4.4.1. if the first tone received is not a ? ? or ? # ? (see section 4.5.1) that digit and all subsequent digits will be passed to the network in an information message as a called party number information element. digits received before the network has returned the setup ack message are saved. upon receipt of the setup ack any saved digits will be transmitted. the dtmf tone mapping is as shown below: low group high group (hz) (hz) 1209 1336 1477 1633 697 1 (31) 2 (32) 3 (33) a (not used) 770 4 (34) 5 (35) 6 (36) b (not used) 852 7 (37) 8 (38) 9 (39) c (not used) 941 (2a) 0 (30) # (23) d (not used) once the network has indicated that the full number has been received, no further digits will be sent to the network. all tones and announcements from the network (e.g. ringing, nu, busy etc) and audio (if the call is connected) will be routed to the pots port initiating the call, until that port goes on-hook. 4.5.4 connected calls once a call is connected to an analog port, whether it was incoming or outgoing, a port-specific led indicator pin is set high to indicate that the call is connected. see section 4.7.1 for details of the led indicator pins. once the call is disconnected, either by receipt of a disconnect message from the network or an on-hook indication, the ports ? led indicator pin is set low. during a call, if a recall (i.e. a line break of appropriate length) is received from a pots port, the cmx208 will start to look for dtmf tones received on that pots port. any tones received will then be sent to the network in isdn information messages, as keypad information elements . 4.5.5 call clearing the call is cleared either by the port going on-hook or by the isdn network. note that the isdn b-channel, which was being used, is not released until the pots port, which was in use, has gone on-hook. 4.6 application programmer's interface details of this will be supplied to customers under a non-disclosure agreement. the following memory map indicates the main code areas used on the cmx208: function start hex address end hex address code space 000 000 01f fff external ram 020 000 03f fff api area 0c0 000 0ef fff amd79c30 isdn interface chip 0f0 000 0f0 0ff psb21525 hdlc driver chip 0f0 100 0f0 1ff reserved 0f0 200 0ff fff
isdn dual telephony protocol engine 15 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 4.7 hardware description 4.7.1 led status indicators (led1 to led9, and ilfi) led1 (hk1) is low when analog port 1 is off-hook, high when on-hook. led2 (hk2) is low when analog port 2 is off-hook, high when on-hook. led4 (cn2) is high when analog port 2 is connected to the isdn network, low when not connected. led8 (ar) is pulsed high and low until the isdn line is activated, when it remains low constantly. led9 (cn1) is high when analog port 1 is connected to the isdn network, low when not connected. ilfi is high when an isdn link failure is indicated, low when the link is operational. the functions of the led and ilfi indicators are set out in the table below: pin no. designation pots port 1 pots port 2 12 led1 off-hook ~ 13 led2 ~ off-hook 15 led4 ~ call connected 19 led8 isdn line activated isdn line activated 21 led9 call connected ~ 54 ilfi isdn line failure indicator isdn line failure indicator
isdn dual telephony protocol engine 16 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 5. application notes 5.1 general the cmx208 is intended for use as part of an isdn chipset. the mx-com recommended hardware implementation contains the following elements (refer to figure 3): ? ? s ? bus interface via rj45 socket. ? rj11 analog telephone sockets and analog circuitry. ? isdn line transformer. ? amd79c30 s-interface controller. ? auxiliary motorola mc145480 pcm codec. ? 64k bytes external ram. ? 16k non-volatile memory. ? six processor controlled led indicator signals. ? hdlc drivers for the 2 isdn b-channels, both channels can be used for data transfer. 12v s/t 50v 5v 24c16 hy 6281009 tc 1232co 10 x leds 16k eeprom 128k ram watchdog 5 x interface ics 31909x029 discrete pots 1 slic discrete pots 2 slic amd am79c30 s/t controller & pcm codec fifo & dlc tx dtmf,ring,tones parallel bus cmx208 cmx605 cmx605 4k ram 128k rom protocol engine ic 2 bus iom2 bus rxdtmf rxdtmf txclid,spm txclid,spm ring & tones ring & tones motorola mc34063a mc7805ct psu transformer c-bus c-bus api port pots port pots port motorola mc145480 pcm codec figure 3: application block diagram 5.2 approvals the firmware and finite state machine embedded in the cmx208 has been designed into products that have gained etsi ctr3 approval.
isdn dual telephony protocol engine 17 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 6. performance specification 6.1 electrical performance 6.1.1 absolute maximum ratings exceeding these maximum ratings can result in damage to the device. min. max. units supply (av dd - av ss ), (dv dd0 - dv ss0 ), (dv dd1 - dv ss1 ) -0.3 7.0 v voltage on any pin to av ss , dv ss0 or dv ss1 -0.3 v dd + 0.3 v current into or out of any v dd or v ss pin -30 100 ma current into or out of any other pin -20 10 ma s1 package (qfp) total allowable power dissipation at t amb = 25 c 1300 mw derating above 25 c 17 mw/ c above 25 c storage temperature -55 125 c operating temperature -40 85 c 6.1.2 operating limits correct operation of the device outside these limits is not implied. notes min. max. units supply: (av dd - av ss ), (dv dd0 - dv ss0 ), and (dv dd1 - dv ss1 ) 2.7 5.5 v operating temperature -40 85 c 32 mhz xtal frequency tolerance -100 100 ppm
isdn dual telephony protocol engine 18 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 6.1.3 operating characteristics details in this section represent design target values and are not currently guaranteed. for the following conditions unless otherwise specified: xtal frequency = 32mhz 100ppm, av dd = dv dd0 = dv dd1 = 3.0v to 5.0v, t amb = - 40 c to +85 c. notes min. typ. max. units dc parameters i dd (total, operational) 1 25.0 45.0 ma i dd (total in halt mode) 1 13.0 26.0 ma i dd (total in idle mode) 1 12.0 ma digital interface input logic "1" level 70% v dd input logic "0" level 30% v dd input leakage current (v in = 0 to dv dd ) -10.0 +10.0 a output logic "1" level (l oh = 120a) v dd -1.0 ? v output logic "0" level (l ol = 360a) 400 mv input or output leakage current (v out = v dd ) 10 a xtal/clock input 'high' pulse width (t wxh ) 2 10 125 ns 'low' pulse width (t wxl ) 2 10 125 ns risetime (t xr ) 2 10 ns falltime (t xf ) 2 10 ns period (t cyk ) 2, 3 31.2468 31.2531 ns notes: 1. not including any current drawn by external circuitry. 2. timing for an external input to the xtal pin. 3. a fundamental cut crystal is recommended.
isdn dual telephony protocol engine 19 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 6.1.3.1 timing diagrams rd wr astb astb a/d0-a/d7 a/d0-a/d7 a8-a19 a8-a19 t wsth t sast t hstla t dstid t daid t dstr t dar t fra t drid t wrl t hrid t dra t hra t drst t dstw t daw t dwod t wwl t hwod t hwa t dwst t wsth t sast t hstla t dstod t sodw (1) read operation (2) write operation figure 4: external memory access timing
isdn dual telephony protocol engine 20 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies astb nmi rst xtal interrupt input timing clock output timing reset input timing external clock timing t clh t cll t clr t clf t cycl t wnil t wnih t wxl t wxh t wrsl t wrsh t xr t xf t cyk figure 5: miscellaneous timing
isdn dual telephony protocol engine 21 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies 6.1.3.2 ac timing parameters for the following conditions unless otherwise specified: xtal frequency = 32mhz, av dd = dv dd0 = dv dd1 = 3.0v to 5.0v, t amb = - 40 c to +85 c. 6.1.3.2.1 read/write operation where: t = t cyk (system clock cycle time) a = 1 (during address wait), otherwise, 0 n = number of wait states (n = 2) parameter symbol conditions min. max. units address setup time t sast v dd = +5.0v 10% (0.5 + a) t - 15 (0.5 + a) t - 31 ns ns astb high-level width t wsth v dd = +5.0 v 10% (0.5 + a) t - 17 (0.5 + a) t - 40 ns ns address hold time to (astb ) t hstla v dd - +5.0 v 10% 0.5t - 24 0.5t - 34 ns ns address hold time (to rd ) t hra 0.5t - 14 ns delay from address to rd t dar v dd = +5.0v 10% (1 + a) t - 9 (1 + a) t - 15 ns ns address float time (to rd ) t fra 0 ns delay from address to data input t daid v dd = +5.0v 10% (2.5 + a + n) t - 37 (2.5 + a + n) t - 52 ns ns delay from astb to data input t dstid v dd = +5.0v 10% (2 + n) t - 40 (2 + n) t - 60 ns ns delay from rd to data input t drid v dd = +5.0 v 10% (1.5 + n) t - 50 (1.5 + n) t - 70 ns ns delay from astb to rd t dstr 0.5t - 9 ns data hold time (to rd ) t hrid 0 ns delay from rd to address active t dra v dd = +5.0 v 10% after program is read after program is read v dd = +5.0 v 10% after data is read after data is read 0.5t - 8 0.5t - 12 1.5t - 8 1.5t - 12 ns ns ns ns delay from rd to astb t drst 0.5t - 17 ns rd low-level width t wrl v dd = 5.0 v 10% (1.5 + n) t - 30 (1.5 + n) t - 40 ns ns address hold time (to wr ) t hwa 0.5t - 14 ns delay from address to wr t daw v dd = +5.0v 10% (1 + a) t - 5 (1 + a) t - 15 ns ns delay from astb to data output t dstod v dd = +5.0v 10% 0.5t + 19 0.5t + 35 ns ns delay from wr to data output t dwod 0.5t - 11 ns delay from astb to wr t dstw 0.5t - 9 ns data setup time (to wr ) t sodw v dd = +5.0 v 10% (1.5 + n) t - 30 (1.5 + n) t - 40 ns ns data hold time (to wr ) note 1 t hwod v dd = +5.0v 10% 0.5t - 5 0.5t - 25 ns ns delay from wr to astb t dwst 0.5t - 12 ns wr low-level width t wwl v dd = +5.0v 10% (1.5 + n) t - 30 (1.5 + n) t - 40 ns ns
isdn dual telephony protocol engine 22 cmx208 advance information mx-com, inc ? 2000 mx-com, inc. 4800 bethania station road, winston-salem, nc, 27105-1201, usa doc. # 20480214.001 www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 ? 2000 chiron technology limited all trademarks and service marks are held by their respective companies note 1: hold time includes the time during which v oh1 and v ol1 are held under the load conditions of c l = 50 pf and r l = 4.7 k ? . 6.1.3.2.2 miscellaneous timing where: t = t cyk (system clock cycle time) a = 1 (during address wait), otherwise, 0. n = number of wait states (n = 2) parameter symbol conditions min. max. units astb cycle time t cycl nt ns astb low-level width t cll v dd = +5.0 v 10% 0.5 t cycl - 10 0.5 t cycl - 20 ns ns astb high-level width t clh v dd = +5.0 v 10% 0.5 t cycl - 10 0.5 t cycl - 20 ns ns astb rise time t clr v dd = +5.0 v 10% 10 20 ns ns astb fall time t clf v dd = +5.0 v 10% 10 20 ns ns nmi low-level width t wnil 10 s nmi high-level width t wnih 10 s rst low-level width t wrsl 10 s rst high-level width t wrsh 10 s 6.2 packaging figure 6: 80-pin qfp mechanical outline: order as part no. CMX208S1

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