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GS2970A Datasheet(PDF) 83 Page - Semtech Corporation

Part # GS2970A
Description  3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS2970A Datasheet(HTML) 83 Page - Semtech Corporation

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GS2970A 3Gb/s, HD, SD SDI Receiver
Data Sheet
54244 - 2
September 2012
83 of 150
4.19.2 Serial Audio Data Format Support
The GS2970A supports the following serial audio data formats:
•I2S (default)
•AES/EBU
• Serial Audio Left Justified, MSB First
• Serial Audio Left Justified, LSB First
• Serial Audio Right Justified, MSB First
• Serial Audio Right Justified, LSB First (this mode is not supported in SD)
By default (at power up or after system reset) I2S is selected. The other data formats are
selectable via the host interface using the AMA/AMB[1:0] bits.
The serial audio output formats may use LSB first according to the settings of the control
bits LSB_FIRSTA, LSB_FIRSTB, LSB_FIRSTC, and LSB_FIRSTD. When in I2S mode, these
control bits must all be set LOW (default).
When I2S format is desired, both groups must be set to I2S (i.e. AMA = AMB = 11). This is
because they share the same WCLK.
Figure 4-36:I2S Audio Output Format
Figure 4-37:AES/EBU Audio Output Format
Table 4-17:Audio Output Formats
AMA/AMB[1:0]
Audio Output Format
00
AES/EBU audio output
01
Serial audio output: Left Justified; MSB first
10
Serial audio output: Right Justified; MSB first
11
I2S (Default)
WCLK
ACLK
AOUT[8/7:2/1]
MSB
0
3
21
2
3
4
5
6
22
LSB
MSB
0
3
2
1
2
3
4
5
6
22
LSB
Channel A (Left)
Channel B (Right)
WCLK
ACLK
AOUT[8/7:2/1]
12
3
4
LSB
MSB
0
Channel A (Left)
Channel B (Right)
56
7
8
27
29
28
30
31
123
4
0
5
6
7
8
27
29
28
30
31
AUX
Preamble
P
C
V
U
LSB
MSB
AUX
Preamble
P
C
VU


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