SAA2003 Просмотр технического описания (PDF) - Philips Electronics

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SAA2003

Stereo filter and codec

Philips Electronics 

Philips Semiconductors

Stereo filter and codec

Preliminary specification

SAA2003

Table 2 Transparent mode function in sleep.

PIN

FS256

FS256

SD2

SD2

IECOP

IECOP

IECOP

TRANSPARENT

MODE(1)

1

0

1

0

0

1

1

WS-SEL(2)

X

X

X

X

X

0

1

PIN FUNCTION

FS256

high impedance

SD1

high impedance

high impedance

high impedance

WS

Notes

1. Transparent mode is controlled by bit 3 of the serial audio data interface mode control register.

2. WS-SEL is controlled by bit 3 of the codec extended settings register.

Serial audio interface

The signals between the SAA2003 and the serial audio input/output are shown in Table 3.

Table 3 Interface signals between SAA2003 and serial audio input/output.

PIN

WS

SCK

SD1

SD2

FDIR

IECOP

INPUT/OUTPUT

bi-directional

bi-directional

bi-directional

output

output

output

FUNCTION

audio data word select

audio data bit clock

serial audio data to/from DAIO and ADC

audio serial data to DAC

PASC mode encode/decode

alternative serial data word select for SD2

FREQUENCY

fs

64fs

−

−

−

−

The word select (WS) line indicates the channel being transmitted (either left or right; I or II) and is equal in frequency to

the sampling frequency (fs).

Operating at a frequency of 64 × fs, the bit clock (SCK) dictates that each WS period contains 64 SD1 or SD2 data bits.

Of these bits a maximum of 36 are used to transfer data (samples may have a length up to 18 bits). Samples are

transferred most significant bit (MSB) first. Both WS and SD1/SD2 change state at the negative edge of SCK.

The serial audio data is transferred between the SAA2003 and the input/output using either the standard I2S (default) as

shown in Fig.8 or the EIAJ format as shown in Fig.9.

May 1994

10

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