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GS9090B Datasheet(PDF) 46 Page - Gennum Corporation |
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GS9090B Datasheet(HTML) 46 Page - Gennum Corporation |
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46 / 71 page  GS9090B Data Sheet 40749 - 2 January 2007 46 of 71 3.9.8.1 Illegal Code Remapping If the ILLEGAL_REMAP bit of the IOPROC_DISABLE register is set LOW, the GS9090B will remap all codes within the active picture between the values 3FCh and 3FFh to 3FBh. All codes within the active picture area between the values 00h and 03h will be re-mapped to 04h. In addition, 8-bit TRS and ancillary data preambles will be remapped to 10-bit values. 3.9.8.2 EDH CRC Error Correction If the EDH_CRC_INS bit of the IOPROC_DISABLE register is set LOW, the GS9090B will calculate and overwrite the active picture and full field CRC words into the EDH data packets received by the device. Additionally, when EDH_CRC_INS is LOW, the device will set the active picture and full field CRC ‘V’ bits HIGH in the EDH packet (see Section 3.9.4). The AP_CRC_V and FF_CRC_V register bits will only report the received EDH validity flags. EDH CRC calculation ranges are described in Section 3.9.7.2. NOTE: Although the GS9090B will modify and insert EDH CRC words and EDH packet checksums, the device will only update EDH error flags when the EDH_FLAG_UPDATE bit is set HIGH (see Section 3.9.4). 3.9.8.3 Ancillary Data Checksum Error Correction If the ANC_CSUM_INS bit of the IOPROC_DISABLE register is set LOW, ancillary checksum error correction and insertion is enabled, and the GS9090B will calculate and overwrite ancillary data checksums for all ancillary data words by default. If the Ancillary Data type has been specified in the ANC_TYPE registers of the host interface (see Section 3.9.2.1), only the checksums for the ancillary data programmed will be updated. 3.9.8.4 TRS Error Correction If the TRS_INS bit of the IOPROC_DISABLE register is set LOW, TRS error correction and insertion is enabled. In this mode, the GS9090B will calculate and overwrite 10-bit TRS code words as required. TRS code word generation will be performed using the timing parameters generated by the flywheel to provide an element of noise immunity, and will only take place if the flywheel in enabled (FW_EN = HIGH). NOTE: Only H timing based errors will be corrected (see Section 3.9.7.5). |
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