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GS2970A Datasheet(PDF) 72 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 72 Page - Semtech Corporation |
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72 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 72 of 150 When operating in SD mode, only the YCS_ERR bit is set HIGH when checksum errors are detected. 4.17.3.1 Programmable Ancillary Data Checksum Calculation As described above, the GS2970A 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 4.17.1. When so programmed, the GS2970A 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. 4.17.4 Video Standard Error If a mismatch between the received SMPTE 352M packets and the calculated video standard occurs, the GS2970A 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: The VD_STD_ERR bit should be ignored in all 3G modes. NOTE 3: 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. 4.18 Signal Processing In addition to error detection and indication, the GS2970A can also correct errors, inserting corrected code words, checksums and CRC values into the data stream. The following processing can be performed by the GS2970A: 1. TRS error correction and insertion. 2. HD line based CRC correction and insertion. 3. EDH CRC error correction and insertion. 4. HD line number error correction and insertion. 5. Illegal code re-mapping. |
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