| GENERAL DESCRIPTION The Am79C30A Digital Subscriber Controller (DSC) Circuit and Am79C32A ISDN Data Controller (IDC) Circuit, shown in the Block Diagram, allow the realization of highly-integrated Terminal Equipment for the ISDN. The Am79C30A/32A is fully compatible with the CCITT-I-series recommendations for the S and T reference points, ensuring that the user of the device may design TEs which conform to the international standards. DISTINCTIVE CHARACTERISTICS ■ Combines CCITT I.430 S/T-Interface Transceiver, D-Channel LAPD Processor, Audio ■ Processor (DSC device only), and IOM-2 Interface in a single chip ■ Special operating modes allow realization of CCITT I.430 power-compliant terminal equipment ■ S- or T-Interface Transceiver — Level 1 Physical Layer Controller — Supports point-to-point, short and extended passive bus configurations — Provides multiframe support ■ Certified protocol software support available ■ CMOS technology, TTL compatible ■ D-channel processing capability — Flag generation/detection — CRC generation/checking — Zero insertion/deletion — Four 2-byte address detectors — 32-byte receive and 16-byte transmit FIFOs ■ Audio processing capability (DSC circuit only) — Registers for implementation of software-based speaker phone algorithms — Dual audio inputs — Earpiece and loudspeaker drivers — Codec/filter with A/µ selection — Programmable gain and equalization filters — Programmable sidetone level — Programmable DTMF, single tone, progress tone, and ringer tone generation — Programmable on-chip microphone amplifier ■ Pin and software compatible with the Am79C32A ISDN Data Controller (IDC™) Circuit. The Am79C32A is used in data-only applications. |
