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AM79C32AVC Scheda tecnica(PDF) 2 Page - Advanced Micro Devices |
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AM79C32AVC Scheda tecnica(HTML) 2 Page - Advanced Micro Devices |
2 / 101 page 2 Am79C30A/32A Data Sheet DISTINCTIVE CHARACTERISTICS (continued) s 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 s Pin and software compatible with the Am79C32A ISDN Data Controller (IDC™) Circuit. The Am79C32A is used in data-only applications. GENERAL DESCRIPTION The Am79C30A Digital Subscriber Controller (DSC) Circuit and Am79C32A ISDN Data Controller (IDC) Cir- cuit, 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 refer- ence points, ensuring that the user of the device may design TEs which conform to the international stan- dards. The Am79C30A/32A provides a 192-Kbit/s full duplex digital path over four wires between the TE located on the subscriber's premises and the NT or PABX line- card. All physical layer functions and procedures are implemented in accordance with CCITT Recommen- dation I.430, including framing, synchronization, main- tenance, and multiple ter minal contention. Both point-to-point and point-to-multipoint configurations are supported. The Am79C30A/32A processes the ISDN basic rate bit stream, which consists of B1 (64 Kbit/s), B2 (64 Kbit/s), and D (16 Kbit/s) channels. The B channels are routed to and from different sections of the Am79C30A/32A under software control. The D channel is partially pro- cessed by the DSC/IDC circuit and is passed to the mi- croprocessor for further processing. The Main Audio Processor (MAP) uses Digital Signal Processing (DSP) to implement a high performance codec/filter function. The MAP interface supports a loudspeaker, an earpiece, and two separate audio in- puts. Programmable on-chip gain is provided to sim- plify use of low output level microphones. The user may alter frequency response and gain of the MAP receive and transmit paths. Tone generators are included to im- plement ringing, call progress, and DTMF signals. A Peripheral Port (PP) is provided to allow the B chan- nels to be routed off-chip for processing by other pe- ripherals. This por t is configurable as either an industry-standard IOM-2 port, or as a serial bus port (SBP). The TE design process is simplified by the availability of certified protocol software packages, which provide complete system solutions through OSI Layer 3. |
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