PSB7230 데이터 시트보기 (PDF) - Siemens AG
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PSB7230 Datasheet PDF : 179 Pages
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PSB 7230
Introduction
system. Status and control information to/from the JADE can be transferred either
inband the compressed audio data via the corresponding selected interface or outband
using an 8-bit parallel host interface.
The audio frontend data can be exchanged either through the host interface or the IOM-2
interface. In the latter case the Siemens ARCOFI SP can be connected providing
half-duplex handsfree or a Siemens ACE (acoustic echo canceller circuit) together with
an ARCOFI BA providing full duplex handsfree.
The default configuration of the JADE is such, that in a videoconferencing system using
the 8x8 (formerly IIT) VCP (Video Codec and Multimedia Communications Processor)
the Siemens PSB 7230 can work standalone without the need of external initialization.
I.e., no host is needed in this case and the full communication is automatically started
between the VCP and the Siemens PSB 7230.
The voice compression algorithms are implemented by an embedded 16-bit fixed point
Digital Signal Processor with all memories internal and no external memory needed.
Integration of these and other features, as well as perfectly matched interfaces with other
ICs allows for the implementation of highly optimized, low cost system solutions e.g. for
Videophones, Data-over-voice and Channel Multiplexing equipment.
For system integration, a serial data channel is implemented which can be serviced by
an attached host (or the on-chip DSP). System functions and communication between
the chip and an external controller is supported by a full-duplex 256-byte on-chip mailbox
communication memory.
The circuit is offered in a Quad Flat Pack package with 100 pins (P-TQFP-100: size
14 × 14 mm, pitch 0.5 mm, height 1.4 mm).
Note: This Data Sheet gives a thorough description of the functions and hardware that
forms the base of PSB 7230. It includes information that is not needed for the
PSB 7230 as a ‘ready to use plug and play' G.723/G.711 audio compression
device.
Semiconductor Group
7
Data Sheet 1998-07-01
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