GS1503 Gennum Corporation, GS1503 Datasheet - Page 25

• Manufacturer Part Number: GS1503
• Description: HD Embedded Audio Codec
• Manufacturer: Gennum Corporation

1.7 AUDIO DATA PACKETS
1.7.1 Audio Data Packet Structure
Figure 23 shows the structure of the audio data packets as
defined in SMPTE 299M. The audio data packets are
multiplexed into the Chroma channel of the video data
stream. Table 4 lists the description of the individual audio
data packet words. Note that the GS1503 will automatically
generate certain audio data packet words.
Table 4: Audio Data Packet Word Descriptions
1.7.2 Audio Data Packet DID Setting
The audio group DID for audio input channels 1 to 4 (AIN1/
2 and AIN3/4) is set in DATAIDA[1:0] bits 1-0 of Host
Interface register 014h. The audio group DID for audio input
channels 5 to 8 (AIN5/6 and AIN7/8) is set in DATAIDB[1:0]
bits 3-2 of Host Interface register 014h. Table 5 shows the
2-bit Host Interface setting for the corresponding audio
group DID.
ECC0-5
NAME
DBN
ADF
CLK
CH1
CH2
CH3
CH4
DID
DC
CS
WORDS
NO OF
3
1
1
1
2
4
4
4
4
6
1
Ancillary Data Flag
Audio Group Data ID
Data Block Number
Data Count
Audio Clock Phase Data
Channel 1 audio data
Channel 2 audio data
Channel 3 audio data
Channel 4 audio data
Error correction code for lower 8 bits of first 24 words
Checksum. Calculates the sum of lower 9 bits of 22
words from DID
Fig. 23 Audio Data Packet Structure
ECC Protected
DESCRIPTION
25
When CASCADE is set LOW (external pin or register), the
GS1503 will default to audio groups 1 and 2, where AIN1/2
and AIN3/4 will be multiplexed with audio group 1 DID, and
AIN5/6 and AIN7/8 with audio group 2 DID.
User Data Words
Repeat 1-255
DATA
000h
3FFh
3FFh
2E7h
1E6h
1E5h
2E4h
218h
-
-
-
-
-
-
-
AUTO-GENERATION
See Table 5 in
Section 1-7-2
Yes
Yes
Yes
Yes
Yes
Yes
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