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GS2970A Datasheet(PDF) 71 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 71 Page - Semtech Corporation |
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71 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 71 of 150 4.17.2.2 3G SMPTE 352M Packets Following Level B to Level A Conversion After Level B to Level A conversion, modified payload data must be programmed via the host interface into the VIDEO_FORMAT_352_X_X registers and automatically inserted by the GS2970A on the correct SMPTE 352M Line Number. SMPTE 352M Packets are embedded in both data streams. Previously embedded 352M packets may be deleted from one data stream only (using the ANC_DATA_DELETE bit, see Section 4.18.8), but these packets are replaced with 10-bit Y/C blanking values. NOTE: Pre-existing SMPTE 352M Packets that are not deleted are re-mapped to different line numbers during conversion to Level A formatting. These packets should be ignored by the system, since they are on non-standard SMPTE 352M lines. 4.17.3 Ancillary Data Checksum Error The GS2970A calculates checksums for all received ancillary data. These calculated checksums are compared with the received ancillary data checksum words. If a mismatch in the calculated and received checksums is detected, then a checksum error is indicated. When operating in HD mode, the device makes comparisons on both the Y and C channels separately. If an error condition in the Y channel is detected, the YCS_ERR bit in the VIDEO_ERROR_STAT_X register is set HIGH. If an error condition in the C channel is detected, the CCS_ERR bit in the VIDEO_ERROR_STAT_X register is set HIGH. When operating in 3G Level A mode, the device makes comparisons on both the Y (Data Stream 1) and C (Data Stream 2) channels separately. If an error condition in the Y channel is detected, the YCS_ERR bit in the VIDEO_ERROR_STAT_X register is set HIGH. If an error condition in the C channel is detected, the CCS_ERR bit in the VIDEO_ERROR_STAT_X register is set HIGH. When operating in 3G Level B mode, the device makes comparisons on both the Y channel and the C channel of both Link A and Link B. Table 4-14:SMPTE 352M Packet Data Bit Name Bit Name Description R/W Default VIDEO_FORMAT_4_DS1 Address: 01Ah 15-8 SMPTE 352M Byte 4 Data is available in this register when Video Payload Identification Packets are detected in the data stream. R0 VIDEO_FORMAT_3_DS1 Address: 01Ah 7-0 SMPTE 352M Byte 3 R0 VIDEO_FORMAT_2_DS1 Address: 019h 15-8 SMPTE 352M Byte 2 R0 VIDEO_FORMAT_2_DS1 Address: 019h 7-0 SMPTE 352M Byte 1 R0 |
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