SAA2503 查看數據表（PDF） - Philips Electronics

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SAA2503

MPEG2 audio decoder

Philips Electronics 

Philips Semiconductors

MPEG2 audio decoder

Objective specification

SAA2503

MPEG2 bitstreams

The MPEG2 audio bitstream is received via the I2S-bus in

the same format as specified in IEC 1937. The MPEG2

audio bitstream consists of data bursts of 1 frame.

The data is formatted in 16-bit chunks. The time period

until the next frame is filled with logic 0. The serial data is

received by the SAA2503 via the SDI1 pin (pin 66).

For more information on transporting MPEG2 bitstreams

via IEC 958 see IEC 1937.

QUAD I2S-BUS

Quad I2S-bus is the interface providing audio samples in

LPCM with 4 times the sampling frequency. The interface

is an extension of the I2S-bus where the Serial Data Begin

(SDB) indicates the first 2 channels out of 8 channels.

The audio samples are transferred with MSB first, where

each sample occupies 32 bits, filled with logic 0.

Linear PCM (LPCM)

I2S-BUS

Linear PCM samples are received in an I2S-bus format.

Serial audio data is received via SDI1 (pin 66).

The I2S-bus clock is received via SCKR (pin 61) and the

I2S-bus word select is received via WSR (pin 65); the

I2S-bus clock operates at 64fs.

handbook, full pagewidth

SD

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

WS

SDB

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, SCK

12S-bus clock/Quad 12S-bus clock

1 sampling period

MGK398

Fig.3 Quad I2S-bus frame format.

The SDB remains HIGH when only 2 channels LPCM or encode bitstreams (in accordance with IEC 1937) are

transferred (Quad I2S-bus is equal to I2S-bus).

1997 Jul 02

9

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