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CMX635

ISDN Subscriber Processor
Features:
  • ISDN S-BUS to POTS Signalling Interface with HDLC Controller and PCM Codec
  • Multi-Framing to I.430
  • Support for ISDL HDLC Functions
  • SPM, Ring and Call Progress Tone Generators
  • PCM Codec: Selectable to A-Law or µ-Law Compand Algorithm
  • On-Chip POTS Port Signalling
  • On-Chip SpeakerPhone Functions
  • Two, Independent Differential Analogue Inputs
  • Two, Independent Differential Analogue Outputs
  • Full DTMF Encode/decode Functions
  • POTS CLI/CIDCW Facilities
  • 1024-Byte FIFO Configurable for B and D Channels
  • Programmable IOM2/GCI Peripheral Bus Controller
  • Low Power with Progressive Powersave
Applications:
  • ISDN Voice, Data and Signalling
  • Telephones, Payphones and PABX
  • Data Adapters
  • Alarm Systems
  • Active and Passive Terminal Adapters
  • Point-of-Sale Terminals
  • 'Group 4' Fax Equipment
Packages:
  • CMX635L4 - 48-pin LQFP
Supply Requirement:
  • 3.0 to 5.5 V power supply
Description
The CMX635 is an integrated Subscriber Processor designed for low chip-count ISDN voice/data terminals and POTS terminal adaptors.
Its functions facilitate operation in an ISDN feature phone with speakerphone capability or in a POTS terminal adapter with Subscriber Pulse Metering (SPM), DTMF encoder/decoder, Caller Line ID (CLID) and Caller ID on Call Waiting (CIDCW) capabilities.

It also implements many functions needed in an intelligent NT or NT1Plus system.
The CMX635 incorporates a 4-wire ST interface conforming to ITU-T I.430 and ETS 300 012-1 specifications.
HDLC Controllers and associated FIFOs are provided for B1, B2 and D-channels, which can be configured to automatically process the bit stuffing, flag generation/recognition, address matching and CRC generation/checking required to support the ITU Q.921 protocol. An IOM-2TM /GCI interface is provided to enable operation with other IOM compliant devices.

The µController interface is compatible with multiplexed and non-multiplexed address/data busses and generic Motorola and Intel style control.
The CMX635 will automatically detect which style of interface is being used and configure itself accordingly.
The device is available in a 48-pin TQFP package and has progressive powersave modes to aid low power operation.

Block Diagram

CMX635: an integrated Subscriber Processor designed for low chip-count ISDN voice/data terminals and POTS terminal adaptors

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