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GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

67 of 179

Semtech

www.semtech.com

4.19.3 Ancillary Data Checksum Error

The GS3471 calculates checksums for all received ancillary data. These calculated

checksums are compared with the received ancillary data checksum words.

If a mismatch in the calculated and received checksums is detected, then a checksum

error is indicated.

When operating in HD mode, the device makes comparisons on both the Y and C

channels separately. If an error condition in the Y channel is detected, the

YCS_ERR_[2:1] bit in the ERROR_STAT_[2:1] register is set HIGH. If an error condition

in the C channel is detected, the CCS_ERR_[2:1] bit in the ERROR_STAT_[2:1] register

is set HIGH.

When operating in 3G Level A mode, the device makes comparisons on both the Y (Data

Stream 1) and C (Data Stream 2) channels separately. If an error condition in the Y

channel is detected, the YCS_ERR_[2:1] bit in the ERROR_STAT_[2:1] register is set

HIGH. If an error condition in the C channel is detected, the CCS_ERR_[2:1] bit in the

ERROR_STAT_[2:1] register is set HIGH.

When operating in 3G Level B mode, the device makes comparisons on both the Y

channel and the C channel of both Link A and Link B. For Link A, if an error condition in

the Y channel is detected, the YCS_ERR_[2:1] bit in the ERROR_STAT_1 register is set

HIGH. If an error condition in the C channel is detected, the CCS_ERR_[2:1] bit in the

ERROR_STAT_1 register is set LOW. For Link B, if an error condition in the Y channel is

detected, the YCS_ERR_[2:1] bit in the ERROR_STAT_2 register is set HIGH. If an error

condition in the C channel is detected, the CCS_ERR_[2:1] bit in the ERROR_STAT_2

When operating in SD mode, only the YCS_ERR_[2:1] bit is set HIGH when checksum

errors are detected.

4.20 Signal Processing

4.20.1 Audio De-Embedding Mode

The GS3471 includes an integrated audio de-embedder which is active when the

deserializer is configured for SMPTE mode unless disabled using the AUDIO_EN/DIS pin.

In non-SMPTE modes, the audio de-embedder is powered down to reduce power

consumption. All output pins are LOW when the de-embedder is powered down.

For detailed description of this feature, refer to Section 4.21.

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