GS3471 datasheet(82/179 Pages) SEMTECH

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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

DID

DBN

CLK

CH1

CH2

CH3

CH4

ADF

DID

DBN

CLK

CH1

CH2

CH3

CH4

ADF

DID

DBN

CLK

CH1

CH2

CH3

CH4

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