●Introduction
●Overview
●The Conexant® SmartV.XX Modem is a full-featured, worldwide, controller-based modem that integrates modem controller (MCU), modem data pump (MDP), 256 KB ROM, 32 KB RAM, and SmartDAA system side device (SSD) functions onto a single die.
●The modem operates by executing firmware from internal ROM and RAM. Optional customized firmware is supported with optional external flash ROM memory. Additionally, added/modified country profiles are supported by internal SRAM patch (maximum of one profile) or serial EEPROM. Downloadable architecture supports downloading of customized MCU firmware from the host/DTE to the SmartV.XX modem.
●Features
●General Modem Features
●• Data modem
● − Quick connect, Modem-on-Hold, and PCM upstream functions (V.92 models)
● − ITU-T V.92/V.90 (V.92 models), V.34 (V.92 and V.34 models), V.32bis, V.32, V.29, FastPOS (V.29), V.22 bis, V.22, V.22 Fast Connect, V.23, V.21, Bell 212A, and Bell 103
● − V.250 and V.251 commands
●• Data compression and error correction
● − V.44 data compression
● − V.42 bis and MNP 5 data compression
● − V.42 LAPM and MNP 2-4 error correction
●• Fax modem send and receive rates up to 14.4 kbps
● − V.17, V.29, V.27 ter, and V.21 channel 2
● − EIA/TIA 578 Class 1 and T.31 Class 1.0
●• V.80 synchronous access mode supports host-controlled communication protocols with H.324 interface support
●• Interfaces to optional external ROM/flash ROM, RAM, and/or optional serial EEPROM
●• Data/Fax/Voice call discrimination
●• Hardware-based modem controller
●• Hardware-based digital signal processor (DSP)
●• Worldwide operation
● − Complies to TBR21 and other country requirements
● − On-hook and/or off-hook Caller ID detection for selected countries
● − Call progress, blacklisting
● − Internal ROM includes default values for 29 countries
● − Additional and modified country profile can be stored in internal SRAM
●• Caller waiting detection
●• Caller ID detect
● − On-hook Caller ID detection
● − Off-hook Call Waiting Caller ID detection during data mode in V.92, V.90, V.34, V.32bis, and V.32
●• Distinctive ring detect
●• Modem customization available through patch code that can be stored in optional serial EEPROM or internal SRAM
●• Telephony/TAM
● − V.253 commands
● − 2-bit and 4-bit Conexant ADPCM, 8-bit linear PCM, and 4-bit IMA coding
● − 8 kHz sample rate
● − Concurrent DTMF, ring, and Caller ID detection
●• Full-duplex speakerphone (FDSP) mode using optional CX20442 Voice Codec (S models)
● − Microphone and speaker interface
● − Telephone handset or headset interface
● − Acoustic and line echo cancellation
● − Microphone gain and muting
● − Speaker volume control and muting
●• Built-in host/DTE interface
● − Parallel 16550A UART-compatible interface up to 230.4 kbps
● − Serial ITU-T V.24 (EIA/TIA-232-E) logical interface up to 115.2 kbps
●• Downloadable architecture
●• Direct mode (serial DTE interface)
●• Flow control and speed buffering
●• Automatic format/speed sensing
●• Serial async/sync data; parallel async data
●• Thin packages support low profile designs (1.6 mm max. height)
● − CX81801 Modem device in 128-pin TQFP
● − CX20493 LSD in 28-pin QFN
● − CX20442 VC in 32-pin TQFP
●• +3.3V operation with +5V tolerant digital inputs
●• Typical power use
● − CX81801 and CX20493: 209 mW (Normal Mode); 59 mW (Sleep Mode)
● − CX20442: 5 mW (Normal Mode)
●SmartDAA Features
●• System side powered DAA operates under poor line current supply conditions
●• Modem Wake-on-Ring
●• Ring detection
●• Line current loss detection
●• Pulse dialing
●• Line-in-use detection during on-hook operation
●• Remote hang-up detection for efficient call termination
●• Extension pickup detection
●• Digital PBX line protection
●• Meets worldwide DC Voltage/Current (VI) masks requirements
●Applications
●• Set top boxes
●• Gaming devices
●• Point of sale terminals
●• Remote monitoring and data collections systems
●• Handheld computers
●• Other embedded systems
