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GS1661 Datasheet(PDF) 56 Page - Semtech Corporation |
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GS1661 Datasheet(HTML) 56 Page - Semtech Corporation |
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56 / 84 page  GS1661 HD/SD SDI Receiver Data Sheet 53751 - 3 September 2012 56 of 84 4.16.3 Ancillary Data Checksum Error The GS1661 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 SD mode, only the YCS_ERR bit is set HIGH when checksum errors are detected. 4.16.3.1 Programmable Ancillary Data Checksum Calculation As described above, the GS1661 calculates and compares checksum values for all ancillary data types by default. It is possible to program which ancillary data types are checked as described in Section 4.16.1. When so programmed, the GS1661 only checks ancillary data checksums for the specified data types, ignoring all other ancillary data. The YCS_ERR and/or CCS_ERR bits in the VIDEO_ERROR_STAT_X register are only set HIGH if an error condition is detected for the programmed ancillary data types. 4.16.4 Video Standard Error If a mismatch between the received SMPTE 352M packets and the calculated video standard occurs, the GS1661 indicates a video standard error by setting the VD_STD_ERR bit of the VIDEO_ERROR_STAT_X register HIGH. The device detects the SMPTE 352M Packet version as defined in the SMPTE 352M standard. If the incoming packet is Version Zero, then no comparison is made with the internally generated payload information and the VD_STD_ERR bit is not set HIGH. NOTE 1: If the received SMPTE 352M packet indicates 25, 30 or 29.97PsF formats, the device only indicates an error when the video format is actually progressive. The device detects 24 and 23.98PsF video standards and perform error checking at these rates. NOTE 2: VD_STD_ERR_DS1 is set incorrectly for a 1920x1080/PsF/24 payload ID. To resolve this issue, choose one of the two methods. • Set the VD_STD_ERR_DS1 mask bit high in the ERROR_MASK_1 register to avoid having incorrect assertion of the DATA_ERROR pin. • Monitor the received SMPTE ST0352 packet in the VIDEO_FORMAT_352_A_1 and VIDEO_FORMAT_352_B_1 registers and compare that to the video format identified in the VD_STD_DS1 bits in the DATA_FORMAT_DS1 register. Then, make the determination of whether or not there is a mismatch on their own. |
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