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GS9023ACFY датащи(PDF) 11 Page - Gennum Corporation |
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GS9023ACFY датащи(HTML) 11 Page - Gennum Corporation |
11 / 37 page 11 of 37 GENNUM CORPORATION 19795 - 6 2.1.7 Audio Data Packets The GS9023A can multiplex up to four audio channels. The channels are selectable via the “CHACT(4-1)” bits of Host Interface Register #1h. The audio group (Audio packet data ID) for each device is configured in “AD20ID[3:0]” of Host Interface Register #3h. On power up, the four audio channels and audio group 1 are selected by default. By setting all the “CHACT(4-1)” bits in Host Interface Register #1h to zero, the GS9023A will be in bypass mode whereby any existing audio data packets, with the same audio group ID or otherwise, will pass through the device unchanged and no new audio data packets will be embedded. NOTE: Do not rely on default value. Reprogram on power up or reset. The “CASCADE” bit in Host Interface Register #4h controls the manner in which multiplexing is performed. When “CASCADE” is LOW, the GS9023A deletes all existing ancillary packets. New packets are multiplexed at the first location after the end of active video (EAV) in the horizontal ancillary space (HANC). See Figure 2. When “CASCADE” is HIGH, the GS9023A multiplexes packets at the first free location in the horizontal ancillary (HANC) space after the end of active video (EAV) if there is sufficient space remaining to insert the packet. The GS9023A does not check if existing audio group samples are present in the video signal. Use caution in applications where the video signal contains existing audio packets to avoid adding identical group samples. See Figure 3. The GS9023A assumes that the ancillary space from the first free location is empty to the start of active video (SAV). Existing ancillary data packets (inserted by previous devices) in the video signal must be contiguous from the beginning of the HANC space or the insertion of a new audio data packet may overwrite existing data. See Figure 4. Figure 2 Figure 3 Empty Video Signal before GS9023A Empty Video Signal after GS9023A Insertion of Audio Group 1 ("CASCADE" = LOW) Empty Video Signal before GS9023A Empty Video Signal after GS9023A Insertion of Audio Group 3 ("CASCADE" = HIGH) |
Аналогичный номер детали - GS9023ACFY |
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Аналогичное описание - GS9023ACFY |
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