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GS2970A Datasheet(PDF) 89 Page - Semtech Corporation

Part # GS2970A
Description  3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing
Download  150 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS2970A Datasheet(HTML) 89 Page - Semtech Corporation

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GS2970A 3Gb/s, HD, SD SDI Receiver
Data Sheet
54244 - 2
September 2012
89 of 150
Figure 4-44:Sample Distribution over 5 Video Frames (525-line Systems)
When the audio inputs are asynchronously switched or disrupted, the audio
de-embedder continues to write audio samples into the audio buffer, based on the
current five-frame sequence. The de-embedder then re-locks to the new 5-frame
sequence, at which point a sample may be lost.
NOTE: In SD, all four channel pairs must follow the same five-frame sequence.
4.19.3.3 Audio FIFO Block
The function of the FIFO block is to change the audio data word rate from the ANC rate
multiplexed with the video signal to the 48kHz audio output rate.
The audio FIFO block contains the audio sample buffers; one per audio channel. Each
buffer is 36 audio samples deep. At power up or reset, the read pointer is held at the zero
position until 26 samples have been written into the FIFO (allows for 6 lines per frame
with no audio samples; a maximum of 4 samples per line in SD Mode). See Figure 4-45.
Figure 4-45:Audio Buffer After Initial 26 Sample Write
The position of the write pointer with respect to the read pointer is monitored
continuously. If the write pointer is less than 6 samples ahead of the read pointer (point
A in Figure 4-46), a sample is repeated from the read-side of the FIFO. If the write pointer
is less than 6 samples behind the read pointer (point B in Figure 4-46), a sample is
dropped. This avoids buffer underflow/overflow conditions.
Frame 1
1
e
m
a
r
F
5
e
m
a
r
F
4
e
m
a
r
F
3
e
m
a
r
F
2
e
m
a
r
F
5
e
m
a
r
F
1602
2
0
6
1
2
0
6
1
2
0
6
1
2
0
6
1
1601
1601
8008 Samples
1602 Repeat
Audio Buffer
0
25
35
Read
Pointer
Write
Pointer
Address


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