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GS9092A Datasheet(PDF) 39 Page - Semtech Corporation |
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GS9092A Datasheet(HTML) 39 Page - Semtech Corporation |
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39 / 61 page  GS9092A GenLINX® III 270Mb/s Serializer for SDI and DVB-ASI Final Data Sheet 34715 - 5 February 2013 39 of 61 3.7.3.1 SMPTE 352M Payload Identifier Generation and Insertion If the 352M_INS bit of the IOPROC_DISABLE register is set LOW, the GS9092A can generate and insert SMPTE 352M payload identifier ancillary data packets into the data stream automatically or based on information programmed into the host interface. When the 352M_CALC bit of the IOPROC_DISABLE register is set HIGH, the user must program the SMPTE 352M packet to be inserted into the VIDEO_FORMAT registers (Table 3-5). In addition, the line number(s) in which the packet is to be inserted must be programmed in the 352M_LINE_1 and 352M_LINE_2 registers (Table 3-6). If both line number registers are set to zero, no packets will be inserted. Note: The user must program the SMPTE 352M packet into the VIDEO_FORMAT registers prior to programming the line number(s) in which the packet is to be inserted. Note: It is the responsibility of the user to ensure that there is sufficient space in the horizontal blanking interval for the insertion of the SMPTE 352M packets. These packets will be inserted immediately after the EAV word on the line designated in the standard or by the user If there are other ancillary data packets present, the SMPTE 352M packet will be inserted in the first available space in the HANC. Ancillary data must be contiguous from the EAV. When there is insufficient space available, the 352M packets will not be inserted. When the 352M_CALC bit of the IOPROC_DISABLE register is set LOW, the GS9092A will automatically generate and insert 352M packets into the video stream. The device will also write the generated packet into the VIDEO_FORMAT registers. Note: When the IOPROC_EN pin is set HIGH and all registers contain their default values, the VIDEO_FORMAT registers are set to 0h and do not contain the SMPTE 352M packet. The SMPTE 352M packet will be inserted into the data stream according to the line number and sample position defined in the standard. The 4:3/16:9 bit of the SMPTE 352M packet will be set LOW by default to denote 4:3. For video payloads where 16:9 images are transmitted over 270Mb/s links, the user must program the SMPTE 352M packet accordingly. The video payload identifier packet will be version 1 and comply with the structure defined in SMPTE 352M-2002. Note: The user should turn off SMPTE 352M packet insertion when serializing SDTI signals. Table 3-5: Host Interface Description for SMPTE 352M Payload Identifier Registers Register Name Bit Name Description R/W Default VIDEO_FORMAT_B Address: 10h 15-8 SMPTE 352M Byte 4 SMPTE 352M Byte 4 information must be programmed in this register when 352M_INS is LOW and 352M_CALC is HIGH. R/W 0 7-0 SMPTE 352M Byte 3 SMPTE 352M Byte 3 information must be programmed in this register when 352M_INS is LOW and 352M_CALC is HIGH. R/W 0 |
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