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GS9090B Datasheet(PDF) 37 Page - Gennum Corporation |
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GS9090B Datasheet(HTML) 37 Page - Gennum Corporation |
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37 / 71 page  GS9090B Data Sheet 40749 - 2 January 2007 37 of 71 3.9.5 SMPTE 352M Payload Identifier The GS9090B can receive and detect the presence of the SMPTE 352M payload identifier. Upon detection of this packet, the device will extract the four words contained in the packet to the VIDEO_FORMAT_OUT_A and VIDEO_FORMAT_OUT_B registers at addresses 10h and 0fh (Table 3-8). The device will also indicate the version of the payload packet in bit 7 of the DATA_FORMAT register (Table 3-7). When bit 7 is set HIGH the received SMPTE 352M packet is version 1, otherwise it is version 0. The VIDEO_FORMAT registers will only be updated if the received checksum is the same as the locally calculated checksum. If the device loses lock to the input data stream (LOCKED = LOW), or if the SMPTE_BYPASS pin is asserted LOW, the VIDEO_FORMAT_OUT_A and VIDEO_FORMAT_OUT_B registers will be cleared to zero, indicating an undefined format. This is also the default setting after a device reset. Table 3-7: Host Interface Description for Data Format Register Register Name Bit Name Description R/W Default DATA_FORMAT Address: 04h 15-12 – Not Used – – 11 EDH_FLAG_UPDATE When set HIGH, the device will update the ancillary data, full field, and active picture EDH flags according to SMPTE RP165. R/W 0 10 AP_CRC_V Active Picture CRC Valid bit. R 0 9 FF_CRC_V Full Field CRC Valid bit. R 0 8 EDH_DETECT Set HIGH by the device when EDH packets are detected in the incoming video data. R0 7 VERSION_352M Indicates whether decoded SMPTE 352M packet is version 0 or version 1. See Section 3.9.5. R0 6-5 – Not Used – – 4 STD_LOCK Standard Lock bit. This bit will be set HIGH when the flywheel has achieved full synchronization to the received video standard. See Section 3.9.6. R0 3-0 DATA_FORMAT[3:0] Displays the data format being carried on the serial digital interface. See Section 3.9.6.1. R0 |
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