LSI Logic Confidential
Audio Frame Formats
12-21
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Frame sync is input from the AI_FSYNC pin for audio capture and output
on AO_FSYNC for audio output. Note that frames need not be
back-to-back on input. The number of clocks in each sample must be at
least 32.
Sample and status data are transmitted from the most significant to least
significant bit on the pins. Formats FRFORM 0, 1, 3, and 4 left-justify the
sample in the frame:
•
When an output sample’s memory size is 16 bits and the output
timing is 32 clocks per sample, 16 trailing zeros are appended.
•
When an output sample’s memory size is 16 bits and the output
timing is 64 clocks per sample, 48 trailing zeros are appended.
•
When an output sample’s memory size is 32 bits and the output
timing is 64 clocks per sample, 32 trailing zeros are appended.
Formats 5 through 7 right-justify the sample in the frame:
•
When an output sample’s memory size is 16 bits and the output
timing is 32 clocks per sample, 16 leading zeros are pre-pended.
•
When an output sample’s memory size is 16 bits and the output
timing is 64 clocks per sample, 48 leading zeros are pre-pended.
•
When an output sample’s memory size is 32 bits and the output
timing is 64 clocks per sample, 32 leading zeros are pre-pended.
•
When outputting 32-bit memory size samples with 16 data clocks per
sample in any format, the upper 16 bits are used.
12.6.1 FRFORM 0
shows the FRFORM 0 audio frame format. In FRFORM 0,
only one audio sample is transmitted per frame sync (FSYNC) cycle. The
FSYNC signal is of pulse type; it transitions at the first bit of each
sample. The transition from HIGH to LOW is ignored. The frames need
not be back to back. Samples are left-justified and, with only one sample
per frame, only four channels can be transmitted.
The data has the same format as an input sample specified in the Audio
Configuration command defined in the DMN-8600Programming
Reference Manual.
Содержание DMN-8600
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