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GS2970A Datasheet(PDF) 85 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 85 Page - Semtech Corporation |
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85 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 85 of 150 In 3G Level A signals, the audio data packets must be embedded only in Data Stream Two. In 3G Level B signals, the audio data packets must be embedded in the Chroma streams of either Link A or Link B. The Audio Group Detect registers are set HIGH when audio data packets with a corresponding group DID are detected in the input video stream. The host interface reports the individual audio groups detected. When an audio data packet with a DID set in IDA[1:0] and IDB[1:0] is detected, the audio sample information is extracted and written into the audio FIFO. The embedded audio group selected by IDA[1:0] is described henceforth in this document as Group A or Primary Group. The embedded audio group selected by IDB[1:0] is described henceforth in this document as Group B or Secondary Group. Due to the large size of the horizontal ancillary data space in 720p/24, 720p/25 and 720p/30 video standards, the maximum number of ancillary data words the audio de-embedder can process is limited to 1024 when configured for these standards. 4.19.2.3 Audio Control Packets The audio de-embedder automatically detects the presence of audio control packets in the video stream. When audio control packets for audio Group A are detected, the CTRA_DET bit of the host interface is set HIGH. When audio control packets for audio Group B are detected, the CTRB_DET bit of the host interface is set HIGH. The audio control packet data is accessible via the host interface. The audio control packets must be embedded according to SMPTE 272M (SD) or SMPTE 299M (HD and 3G). In 3G Level A signals, the audio control packets must be embedded only in Data Stream One. In 3G Level B signals the audio control packets must be embedded in the Luma streams of each link that carries audio. NOTE 1: In SD, the control packet host interface registers are updated with new control packet values, after the CTRA_DET/CTRB_DET flags are cleared. In HD, the update happens automatically. NOTE 2: If there is an HD audio packet checksum error, no audio is extracted. The audio packet is not recognized, and the audio stays in the video stream. If nothing but the CLK phase parity bit is wrong, the audio will extract fine. Table 4-18:Audio Data Packet Detect Register Name Description Default ADPG4_DET Audio Group Four Data Packet Detection (1: Detected)0 ADPG3_DET Audio Group Three Data Packet Detection (1: Detected)0 ADPG2_DET Audio Group Two Data Packet Detection (1: Detected)0 ADPG1_DET Audio Group One Data Packet Detection (1: Detected)0 |
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