LSI Logic Confidential
Audio Output Control Register
12-11
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
FrForm
12:10
Specifies the audio stream frame output format as shown
in the table below:
The number of samples/frame specifies the number of
audio samples transmitted per frame sync cycle on each
audio output pin. When one sample/frame is used, only
four channels may be captured or transmitted. Frame
sync is output on AO_FSYNC for audio output. Note: This
field should be programmed at least one frame time
before setting the Go bit.
Pulse frame sync is a low to high transition on out.
Fsync during the first bit or the clock before the first bit of
the first sample in each audio frame. Pulse frame sync is
high for one clock, and then goes low until the next frame.
Frform requires output samples to be 16-clocks each,
since there is no other timing reference to delineate
sample boundaries. Frform transfers four 16-bit word per
frame (additional bits are discarded on input, and zero on
output). For output frames, the first word is the left (lowest
channel number) sample, the second word is the most
significant 16 bits of the status out register, the third word
is the right output sample and the fourth word is the least
significant 16-bits of the status out register.
Left High/Right Low sync is high from during left (lowest
number) channel sample bits and low during right
FrForm
Value
Samples/
Frame
Sync
Type
Frame Sync
Transition
0
1
Pulse
First bit of each sample
1
2 + 2
Status
Pulse
First bit of first sample in
frame
3
2
Left High/
Right Low
First bit of each sample
4
2
Left Low/
Right High
One clock before first bit of
each sample
5
2
Left High/
Right Low
One clock after last bit of
each 16-bit external sample
6
2
Left High/
Right Low
One clock after last bit of
each 18-bit external sample
7
2
Left High/
Right Low
One clock after last bit of
each 20-bit external sample
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 ...