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GS3471 数据表(PDF) 82 Page - Semtech Corporation |
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GS3471 数据表(HTML) 82 Page - Semtech Corporation |
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82 / 179 page  GS3471 Final Data Sheet Rev.4 PDS-060498 September 2017 82 of 179 Semtech www.semtech.com 4.21.2.5 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. Note: Low latency mode option is not available when this feature is enabled. 4.21.2.6 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 ST 299. 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. When a one-bit error is detected in a bit array of the ECC protected region of the audio data packet with audio group DID set in IDA[1:0], the ECCA_ERROR flag is set HIGH. When a one-bit error is detected in the ECC protected region of the audio data packet with audio group DID set in IDB[1:0], the ECCB_ERROR flag is set HIGH. Figure 4-48 shows examples of error correction and detection. Up to 8 bits in error can be corrected, providing each bit error is in a different bit array (shown below). When there are two or more bits in error in the same 24-bit array, the errors are detected, but not corrected. Figure 4-48: ECC 24-bit Array and Examples Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 24-bit array Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Errors corrected Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Errors detected but not corrected ADF ADF ADF DID DBN DC CLK CLK CH1 CH1 CH1 CH1 CH2 CH2 CH2 CH2 CH3 CH3 CH3 CH3 CH4 CH4 CH4 CH4 ADF ADF ADF DID DBN DC CLK CLK CH1 CH1 CH1 CH1 CH2 CH2 CH2 CH2 CH3 CH3 CH3 CH3 CH4 CH4 CH4 CH4 ADF ADF ADF DID DBN DC CLK CLK CH1 CH1 CH1 CH1 CH2 CH2 CH2 CH2 CH3 CH3 CH3 CH3 CH4 CH4 CH4 CH4 |
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