LSI Logic Confidential
12-2
Audio Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
12.1 Data, Serial Clocks and FSYNC
Four channels of serial audio data are clocked in by the two AI_D pins,
and up to eight channels of serial audio data are clocked out of the four
AO_D pins by the clock on the AO_SCLK pin. With two samples/frame,
channel 2n and 2n + 1 use AudioIn/Out[n]. With one sample/frame,
channel n uses AudioIn/Out[n].
AI_FSYNC determines the start or end of the next stream input sample
or frame as specified by the stream frame format and the ISync field in
the Audio Input Control register. If ISync is zero or two, it is an input;
otherwise, it is an output.
When FSYNC is an output, frame sync is generated continuously
independent of the GoI bit. FSYNC determines the start or end of the
next output sample or frame as specified by the Audio Output Control
register.
12.1.1 MCLK
The audio input master clock is internally generated according to Ain
Master in the clock control register. The internally generated audio input
master clock is output on the AI_MCLKO pin.
The audio output master clock is internally generated according to Aout
Master in the clock control register. The internally generated audio output
master clock is output on the AO_MCLKO pin.
12.1.2 IEC-958 Encoder
The IEC958 pin outputs IEC-958 format serial data with timing derived
from the audio output master clock. The IEC958 output sample time
matches the audio output sample time times the R958 field specified
divisor. It is typically used to transmit compressed audio data.
The interface carries either PCM audio samples (mono or stereo) or
compressed audio bitstreams (AC3 or MPEG). The sample rate of audio
samples carried by this interface can be 32, 44.1, 48 or 96 kHz. The
width of audio samples can be up to 24 bits.
Содержание DMN-8600
Страница 14: ...LSI Logic Confidential xiv Contents Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...
Страница 18: ...LSI Logic Confidential xviii Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...
Страница 64: ...LSI Logic Confidential 7 6 Memory Mapping Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...