gs9023-cfy ETC-unknow, gs9023-cfy Datasheet - Page 15

• Manufacturer Part Number: gs9023-cfy
• Description: Embedded Audio Codec
• Manufacturer: ETC-unknow

TABLE 7: Audio Control Packet Rate Word Structure
The audio control packet RATE word bits are defined as
follows:
x[2:0], y[2:0]: Audio sampling rate for subframe 1 and 2
respectively. Fixed at 48kHz.
async, bsync: Set LOW when each audio channel pair is
operating synchronously and set HIGH when operating
asynchronously.
operation.
ACT: The ACT word indicates the active group channels.
The audio control packet ACT word structure is shown in
Table 8.
GENNUM CORPORATION
BIT
b6
b5
b4
b3
b2
b1
b0
Forced
x2 (MSB, fixed to 0)
y0 (LSB, fixed to 0)
x0 (LSB, fixed to 0)
LOW
y1 (fixed to 0)
x1 (fixed to 0)
RATE WORD
bsync
async
due
to
synchronous
15
TABLE 8: Audio Control Packet ACT Word Structure
The audio control packet ACT word bits are defined as
follows:
p: Even parity for bits b0 to b7.
a(4-1): Individual active channel status indicator. The bits
correspond directly to the “CHACT(4-1)” bits of Host
Interface Register #1h. The bits are set HIGH for each
active channel in a given audio group. The correlation of the
active channels for the four active audio groups is shown in
Table 9.
TABLE 9: Audio Control Packet Active Channel Configuration
DELx(0-2): Indicates the amount of accumulated audio
processing delay relative to video, measured in audio
sample intervals for each of the channels. Positive values
indicate that the video leads the audio. The audio control
packets delay word structure is shown in Table 10.
CHACT 1
CHACT 2
CHACT 3
CHACT 4
BIT
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
Channel 1
Channel 2
Channel 3
Channel 4
GROUP1
Channel 5
Channel 6
Channel 7
Channel 8
GROUP2
reserved (set to 0)
reserved (set to 0)
reserved (set to 0)
reserved (set to 0)
ACT WORD
not b8
a4
a3
a2
a1
p
Channel 10
Channel 11
Channel 12
Channel 9
GROUP3
Channel 13
Channel 14
Channel 15
Channel 16
GROUP4
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