product preview conexant doc. no. 102235c february 19, 2004 scxv.92/v.34/v.32bis modem controller-based modem with worldwide smartdaa 3 line side device for embedded applications overview the conexant ? scxv.92, scxv.34, and scxv.32bis mode ms are worldwide operational modem device sets for embedded applications that support modulations up to v.92, v.34, and v.32bis, respecti vely. all modems also s upport v.44/v.42bis/mnp 5 data compression for greater data throughput, v.42 lapm/mnp2-4 error correction protocol for increased data integrity and reliability. the scxv.92/v.34/v.32bis device set consists of a modem device and a smartdaa ? 3 line side device (lsd). the modem device in tegrates a microcontroller (mcu), a digital signal processor (dsp), and a smartdaa system side device (ssd) onto a single die (figure 1). the modem is available in 28- pin or 38-pin tssop versions. the 28-pin version is for serial interface applications (figur e 2) and is footprint-compatible with the cx84100 (scxv.22bis) and cx81801-9x (smart v.xx) modem devices. the 38-pin version is for serial (figure 3) or parallel (fi gure 4) interface applications (interface type selectable by an i/o pin). major hardwa re interfaces are illustrated in figure 1. conexant?s smartdaa technology used in the smartdaa 3 lsd eliminates the need for bulky analog transformers, relays, and opto-is olators typically used in discrete daa implementations. the smartdaa 3 lsd operat es without drawing power from the phone line, unlike line-powered daas, and is therefore not subject to variations in line voltage conditions. the smartdaa 3 lsd also adds enhanced telephony extension features to the modem?s operation and other functions such as call waiting detect ion, and caller id decoding. incorporating conexant?s proprietary digital isolation barrier (dib) design and other innovative daa features, the smartdaa architecture simplifies application design and minimizes layout area to reduce design cost. the smartdaa 3 lsd is available in a 28-pin quad flat no-lead (qfn) package or in a 32-pin low profile quad pack (lqfp) package. the modem operates by executing masked code from internal rom. the modem features internal ram memory that enha nces the modem's flexibility. the modem's internal ram can be used to load new country profiles, override existing country profiles or add customized firmware code. an opt ional external serial nvram is supported by the 38-pin version. the optional external nv ram adds the convenience of permanent storage, just like internal ram, nvram can be used to store new country profiles, override existing ones or add customized firmware code. small, low-profile packages, reduced volt age operation, and low power consumption make this device set an ideal so lution for embedded applications. applications ? set top boxes ? point-of-sale terminals ? atm machines ? metering terminals ? video game consoles ? internet appliances features ? modulations and protocols ? itu-t v.92 ? modem-on-hold (moh) ? quick connect (qc) ? pcm upstream ? v.90/v.34/v.32bis/v.32 ? v.22bis/v.22/v.23/v.21 ? v.23 reverse, v.23 half-duplex ? bell 212a/bell 103 ? v.29 fastpos ? v22bis fast connect ? v.80 synchronous access mode ? data compression ? v.44/v.42bis/mnp5 ? error correction ? v.42/mnp 4/mnp 2 ? call waiting (cw) detection ? type i and type ii caller id (cid) decoding ? dte/host interface ? serial dte interface ? parallel 16550 uart- compatible host interface (38-pin version) ? direct mode ? synchronous mode ? asynchronous mode (continued on page 2)
scxv.92/v.34/v.32bis modem product preview 2 conexant 102235c features (continued) ? no external memory required ? embedded and upgradeable country profiles ? serial nvram interface for optional permanent country profile storage (38-pin version) ? embedded at commands ? full-duplex 8-bit/14-bit pcm voice pass-through mode ? smartdaa ? extension pick up detection ? digital line protection ? line reversal detection ? line-in-use detection ? remote hang-up detection ? worldwide compliance ? selectable 28.224 mhz or 27.000 mhz frequency of operation ? low power and voltage ? single +3.3v supply ? low power consumption mode ? +3.3v i/o level ? compact, robust board design ? small, low-profile modem packages ? smartdaa and dib technologies ? reference design supports 5kv isolation figure 1. scxv.92/v.34/v.32bis modem simplified interface v.92/v.34/v.32bis modem 28-pin or 38-pin tssop mcu/dsp/ smartdaa interface dte/host interface serial or parallel* interface 102387_001 ram tip ring external discrete components telephone line digital isolation barrier (dib) components cx20493 smartdaa 3 line side device (lsd) 28-pin qfn or 32-pin lqfp line side dib interface (lsdi) codec telephone line interface daa hardware rom optional nvram* * 38-pin version only. 28.224 mhz or 27.000 mhz clock source
scxv.92/v.34/v.32bis modem product preview 102235c conexant 3 figure 2. CX86500 modem 28-pin tssop with serial interface hardware signals xtli xtlo xtli xtlo txd# rxd# cts# ri# dtr# rts# rxclk# txclk# rlsd# sclksel# reset# lpo 1 2 1 2 5 4 11 18 12 10 6 8 17 15 3 23 serial host interface pwrclkp pwrclkn dib_datap dib_datan dspkout vdd_core vdd vdd gnd gnd reserved reserved reserved reserved 26 27 20 21 28 24 7 22 9 25 13 14 16 19 102287_002 CX86500 modem 28-pin tssop serial interface digital isolation barrier (dib) reset circuit speaker circuit +3.3v 240k +3.3v 28.224 mhz or 27.000 mhz clock oscillator nc 28.224 mhz crystal 33 pf 33 pf 1 m 33 alternative clock source crystal circuit source frequency select circuit
scxv.92/v.34/v.32bis modem product preview 4 conexant 102235c figure 3. CX86500 modem 38-pin tssop with serial interface hardware signals xtli xtlo xtli xtlo txd# rxd# cts# ri# dtr# rts# dsr# rxclk# txclk# rlsd#/clksel# sclksel# reset# lpo 3 4 3 4 7 6 16 23 17 15 27 8 12 22 20 5 31 pwrclkp pwrclkn dib_datap dib_datan dspkout nvmdata nvmclk/parif vdd_core vdd vdd vdd gnd gnd gnd gnd nc nc reserved reserved reserved reserved reserved reserved 34 35 25 26 36 29 13 32 9 10 30 1 14 33 38 2 37 11 18 19 21 28 24 102287_004 CX86500 modem 38-pin tssop serial interface digital isolation barrier (dib) reset circuit speaker circuit +3.3v 240k +3.3v nc serial eeprom 28.224 mhz or 27.000 mhz clock oscillator nc 28.224 mhz crystal 33 pf 33 pf 1 m 33 alternative clock source crystal circuit source serial host interface frequency select circuit 10k
scxv.92/v.34/v.32bis modem product preview 102235c conexant 5 figure 4. CX86500 modem 38-pin tssop with parallel interface hardware signals xtli xtlo xtli xtlo ha0 ha1 ha2 hd0 hd1 hd2 hd3 hd4 hd5 hd6 hd7 hcs# hrd# hwt# hint pclksel# reset# lpo 3 4 3 4 6 7 8 12 15 16 17 22 23 27 28 18 21 20 19 11 5 31 parallel host interface pwrclkp pwrclkn dib_datap dib_datan dspkout nvmdata nvmclk/parif vdd_core vdd vdd vdd gnd gnd gnd gnd nc nc reserved 34 35 25 26 36 29 13 32 9 10 30 1 14 33 38 2 37 24 102287_006 CX86500 modem 38-pin tssop parallel interface digital isolation barrier (dib) reset circuit speaker circuit +3.3v 240k +3.3v nc serial eeprom 28.224 mhz or 27.000 mhz clock oscillator nc 28.224 mhz crystal 33 pf 33 pf 1 m 33 alternative clock source crystal circuit source frequency select circuit
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