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GS2970A Datasheet(PDF) 86 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 86 Page - Semtech Corporation |
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86 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 86 of 150 4.19.2.4 Setting Packet DID Table 4-19 below, shows the 2-bit host interface setting for the audio group DID's. For 24-bit audio support in SD mode, extended audio packets for Group A must have the same group DID set in IDA[1:0] of the host interface. Extended audio packets for Group B must have the same group DID set in IDB[1:0] of the host interface. The audio de-embedder automatically detects the presence of extended audio packets. When detected, the audio output format is set to 24-bit audio sample word length. The audio de-embedder defaults to audio Groups One and Two, where Group A is extracted from packets with audio Group One DID, and Group B from packets with audio Group Two DID. NOTE: To keep sample delays between audio channels the same after changing the value of IDA or IDB in the SD audio core, the audio FIFOs must be cleared. This is accomplished by asserting CLEAR_AUDIO and de-asserting at least one frame later. When the FIFOs are in the clear state, audio will be muted, but audio clocks will continue to run. 4.19.2.5 Audio Packet Delete Block To delete all ancillary data with a group DID shown in Table 4-19, the ALL_DEL bit in the host interface must be set HIGH. 4.19.2.6 ECC Error Detection & Correction Block (HD Mode Only) The audio de-embedder performs BCH(31,25) forward error detection and correction, as described in SMPTE 299M. The error correction for all embedded audio data packets is activated when the host interface ECC_OFF bit is set LOW (default LOW). The audio de-embedder corrects any errors in both the audio output and the embedded packet. Table 4-19:Audio Group DID Host Interface Settings Audio Group SD Data DID SD Extended DID HD Data DID SD Control DID HD Control DID Host Interface Register Setting (2-bit) 1 2FFh 1FEh 2E7h 1EFh 1E3h 00b 21FDh 2FCh1E6h 2EEh 2E2h 01b 3 1FBh 2FAh 1E5h 2EDh 2E1h 10b 4 2F9h 1F8h 2E4h 1ECh 1E0h 11b Table 4-20:Audio Data and Control Packet DID Setting Register Name Description Default IDA[1-0] Group A Audio data and control packet DID setting 00b IDB[1-0] Group B Audio data and control packet DID setting 01b |
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