STA015 datasheet(10/55 Pages) STMICROELECTRONICS

10 / 55 page

STA015 STA015B STA015T

10/55

Init Mode

"PLAY" and "MUTE" changes are ignored in this mode. The internal state of the decoder will be updated

only when the decoder changes from the state "init" to the state "decode". The "init" phase ends when the

first decoded samples are at the output stage of the device.

Decode Mode

This mode is completely described by the following table:

Figure 7. MPEG Decoder Interface

Figure 8. Serial Input Interface Clocks

3.0 INTERFACE DESCRIPTION

3.1 Serial Input Interface

STA015 receives the input data (MSB first) through the Serial Input Interface (Fig.7). It is a serial commu-

nication interface connected to the SDI (Serial Data Input) and SCKR (Receiver Serial Clock).

The interface can be configured to receive data sampled on both rising and falling edge of the SCKR clock.

The BIT_EN pin, when set to low, forces the bitstream input interface to ignore the incoming data. For

PLAY

MUTE

Clock State

PCM Output

Decoding

Not Running

Running

Decoded Samples

Yes

Running

Yes

DATA

SOURCE

µP

MPEG

DECODER

IIC

D98AU912

IIC

SDO

SCKT

LRCKT

SERIAL AUDIO INTERFACE

SDI

SCKR

BIT_EN

XTO

DAC

XTI

FILT

PLL

OCLK

SCL

SDA

DATA_REQ

SCLK_POL=0

SCLK_POL=4

DATA IGNORED

DATA VALID

SCKR

SDI

BIT_EN

D98AU968A

DATA

IGNORED

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