gs9023-cfy ETC-unknow, gs9023-cfy Datasheet - Page 12

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

TABLE 3: Audio Packet Data Sample Structure
TABLE 4: Channel Identification Within The Audio Groups
GENNUM CORPORATION
CH
1
0
0
1
1
BIT
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
CH
0
0
1
0
1
aud 0 (LSB)
ch 1 (MSB)
ch 0 (LSB)
WORD X
Channel
Channel
Channel
Channel
GROUP
not b8
aud 5
aud 4
aud 3
aud 2
aud 1
Z
1
1
2
3
4
WORD X+1
GROUP
Channel
Channel
Channel
Channel
aud 14
aud 13
aud 12
aud 11
aud 10
not b8
aud 9
aud 8
aud 7
aud 6
2
5
6
7
8
Video signal after GS9023 Insertion of Audio Group 2 & Extended
Channel
Channel
Channel
Channel
GROUP
aud 19 (MSB)
WORD X+2
10
11
12
3
9
aud 18
aud 17
aud 16
aud 15
not b8
C
U
P
V
Audio Group 2 ("CASCADE" = HIGH)
Channel
Channel
Channel
Channel
GROUP
Video signal before GS9023
13
14
15
16
4
Fig. 6
12
The audio packet data sample bits are defined as follows:
Z: The Z flag is set HIGH at the same sample coincident
with the beginning of a new AES channel status block
(frame 0) and is otherwise set LOW. In non-AES/EBU data
input formats this bit is set to the value of the SAFA/B input
pins at the rising edge of WCINA/B.
ch[1:0]: Identification of the channels in an audio group as
shown in Table 4.
aud[19:0]: Twos complement linearly represented audio
data. The audio data is input from the AINA and AINB pins.
V: AES/EBU sample validity bit. If the audio sample is valid
the bit is set LOW. If the audio sample is invalid, the bit is
set HIGH. In non-AES/EBU data input formats, this bit is set
to the value of the VFLA/B input pins at the rising edge of
WCINA/B.
U: AES/EBU user bit. In non-AES/EBU data input formats,
this bit is set to the value of the UDA/B input pins at the
rising edge of WCINA/B.
C: AES/EBU audio channel status bit. In non-AES/EBU data
input formats this bit is set to the value of the CSA/B input
pins at the rising edge of WCINA/B.
P: Even parity for the 26 previous bits in the audio data
sample (excludes b9 in the first and second words).
NOTE: The P bit is not the same as the AES/EBU parity bit.
This bit is automatically generated by the GS9023.
Extended Audio Data Packets
The GS9023 can multiplex 20 or 24 bit audio samples. For
24 bit audio samples, the 20 MSBs of a 24 bit audio sample
are contained in the audio data packets and the 4 LSBs are
contained in an extended audio data packet as defined in
SMPTE 272. The extended audio data packet is multiplexed
immediately following the corresponding audio data packet.
See Figure 6 .
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