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GS1661 Datasheet(PDF) 59 Page - Semtech Corporation |
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GS1661 Datasheet(HTML) 59 Page - Semtech Corporation |
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59 / 84 page  GS1661 HD/SD SDI Receiver Data Sheet 53751 - 3 September 2012 59 of 84 EDH FF and AP CRC's are only inserted when the device is operating in SD mode, and if the EDH data packet is detected in the received video data. Although the GS1661 modifies and inserts EDH CRC's and EDH packet checksums, EDH error flags are only updated when the EDH_FLAG_UPDATE_MASK bit is LOW. This feature is enabled in SD mode, when the IOPROC_EN/DIS pin is HIGH and the EDH_CRC_INS_MASK bit in the IOPROC_1 register is set LOW. 4.17.6 Illegal Word Re-mapping All words within the active picture (outside the horizontal and vertical blanking periods), between the values of 3FCh and 3FFh are re-mapped to 3FBh. All words within the active picture area between the values of 000h and 003h are remapped to 004h. This feature is enabled when the IOPROC_EN/DIS pin is HIGH and the ILLEGAL_WORD_REMAP_DSX_MASK bit in the IOPROC_X register is set LOW. 4.17.7 TRS and Ancillary Data Preamble Remapping 8-bit TRS and ancillary data preambles are re-mapped to 10-bit values. 8-bit to 10-bit mapping of TRS headers is only supported if the TRS values are 3FC 000 000. Other values such as 3FD, 3FE, 3FF, 001, 002 and 003 are not supported. This feature is enabled by default, and cannot be disabled via the IOPROC_X register. 4.17.8 Ancillary Data Extraction Ancillary data may be extracted externally from the GS1661 output stream using the Y/1ANC and C/2ANC signals, and external logic. As an alternative, the GS1661 includes a FIFO, which extracts ancillary data using read access via the host interface to ease system implementation. The FIFO stores up to 2048 x 16 bit words of ancillary data in two separate 1024 word memory banks. The device writes the contents of ANC packets into the FIFO, starting with the first Ancillary Data Flag (ADF), followed by up to 1024 words. All Data Identification (DID), Secondary Data Identification (SDID), Data Count (DC), user data, and checksum words are written into the device memory. The device detects ancillary data packet DID's placed anywhere in the video data stream, including the active picture area. Ancillary data from the Y channel or Data Stream One is placed in the Least Significant Word (LSW) of the FIFO, allocated to the lower 8 bits of each FIFO address. Ancillary data from the C channel or Data Stream Two is placed in the Most Significant Word (MSW) (upper 8 bits) of each FIFO address. NOTE: Please refer to the ANC insertion and Extraction Application Note (Doc ID: 53410), for discrete steps and example of Ancillary data extraction. In SD mode, ancillary data is placed in the LSW of the FIFO. The MSW is set to zero. If the ANC_TYPE registers are all set to zero, the device extracts all types of ancillary data. If programmable ancillary data extraction is required, then up to five types of |
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