SAA7785 データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

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SAA7785

ThunderBird Avenger™ PCI Audio Accelerator

Philips Electronics 

Philips Semiconductors

Preliminary Specification

ThunderBird AvengerTM PCI Audio

Accelerator

SAA7785

SERIAL PORT INTERFACES

OVERVIEW

The SAA7785 chip will contain an S/PDIF Consumer Grade transmit port and an I2S transmit/receive pair. These serial

ports are designed to exchange digital audio data but can be used for any type of data transfer assuming the bandwidth

is adequate. Currently, these ports are connected to the DSP data bus.

The Inter-IC Sound Bus, or I2S Port, is a simple interface used to transfer digital data from one source to another. The

interface is based on a continuous serial clock that determines the data rate along with the word select line and the data

lines. An I2S port can be a master or a slave device. A master device drives the serial clock and word select lines while

a slave device receives the clocking signals. The SAA7785 I2S ports are independently programmable to be either a

master or a slave and for 32.0, 44.1 and 48.0KHz stereo data transfer.

Also included is a Sony/Philips Digital Interface Format, or S/PDIF, serial port. This interface is generally used to trans-

mit raw audio data but is also used to transfer AC-3 encoded data as well using DMA. The S/PDIF format is a synchro-

nous interface with the clock encoded on the data stream. The S/PDIF ports support 32.0, 44.1 and 48.0KHz stereo

data transfer up to 24 bits. The S/PDIF interface is IEC958 Consumer Grade compliant.

1999 Nov 12

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