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GS1661 Datasheet(PDF) 52 Page - Semtech Corporation

Part # GS1661
Description  HD/SD SDI Receiver, with Integrated Adaptive Cable Equalizer complete with SMPTE Video Processing
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS1661 Datasheet(HTML) 52 Page - Semtech Corporation

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GS1661 HD/SD SDI Receiver
Data Sheet
53751 - 3
September 2012
52 of 84
4.15.1 TRS Error Detection
TRS error flags are generated by the GS1661 under the following two conditions:
1. A phase shift in received TRS timing is observed on a non-switching line.
2. The received TRS Hamming codes are incorrect.
Both SAV and EAV TRS words are checked for timing and data integrity errors.
For HD mode, only the Y channel TRS codes are checked for errors.
Both 8-bit and 10-bit TRS code words are checked for errors.
The SAV_ERR bit of the ERROR_STAT_X register is set HIGH when an SAV TRS error is
detected.
The EAV_ERR bit of the ERROR_STAT_X register is set HIGH when an EAV TRS error is
detected.
4.15.2 Line Based CRC Error Detection
The GS1661 calculates line based CRCs for HD video signals. CRC calculations are done
for each 10-bit channel (Y and C for HD video).
These calculated CRC values are compared with the received CRC values.
If a mismatch in the calculated and received CRC values is detected for Y channel data,
the YCRC_ERR bit in the ERROR_STAT_X register is set HIGH.
If a mismatch in the calculated and received CRC values is detected for C channel data,
the CCRC_ERR bit in the ERROR_STAT_X register is set HIGH.
Y or C CRC errors are also generated if CRC values are not embedded.
Line based CRC errors are only generated when the device is operating in HD mode.
Table 4-13: Error Status Register and Error Mask Register
Video Error Status Register
Video Error Mask Register
SAV_ERR (02h, 03h)
SAV_ERR_MASK (037h, 038h)
EAV_ERR (02h, 03h)
EAV_ERR_MASK (037h, 038h)
YCRC_ERR (02h, 03h)
YCRC_ERR_MASK (037h, 038h)
CCRC_ERR (02h, 03h)
CCRC_ERR_MASK (037h, 038h)
LNUM_ERR (02h, 03h)
LNUM_ERR_MASK (037h, 038h)
YCS_ERR (02h, 03h)
YCS_ERR_MASK (037h, 038h)
CCS_ERR (02h, 03h)
CCS_ERR_MASK (037h, 038h)
AP_CRC_ERR (02h)
AP_CRC_ERR_MASK (037h)
FF_CRC_ERR (02h)
FF_CRC_ERR_MASK (037h)
VD_STD_ERR (02h, 03h)
VD_STD_ERR_MASK (037h)


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