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GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

71 of 179

Semtech

www.semtech.com

4.20.8 Illegal Word Re-mapping

All words within the active picture (outside the horizontal and vertical blanking periods),

between the values of 3FCh and 3FFh are re-mapped to 3FBh. All words within the active

picture area between the values of 000h and 003h are remapped to 004h.

This feature is enabled when the IOPROC_EN bit is HIGH and the

ILLEGAL_WORD_REMAP_DS[2:1]_MASK bit in the IOPROC_[2:1] register is set LOW.

For 3G Level A signals, illegal code remapping occurs in both Data Stream 1 and Data

Stream 2.

For 3G Level B signals, illegal code remapping occurs in both Data Stream 1 and Data

Stream 2 of both Link A and Link B.

4.20.9 TRS and Ancillary Data Preamble Remapping

8-bit TRS and ancillary data preambles are re-mapped to 10-bit values. 8-bit to 10-bit

mapping of TRS headers is only supported if the TRS values are 3FC 000 000h. Other

values such as 3FDh, 3FEh, 001h, 002h, and 003h are not supported.

This feature is enabled by default, and can be disabled via the IOPROC_[2:1] register.

4.20.10 Ancillary Data Extraction

The GS3471 includes a FIFO, which extracts ancillary data using read access via the host

interface to ease system implementation. The FIFO stores up to 2048 x 16 bit words of

ancillary data in two separate 1024 word memory banks.

As an alternative, ancillary data may be extracted externally from the GS3471 output

stream using the Y/1ANC and C/2ANC signals, and external logic.

Data is accessed from both memory banks using the same host interface addresses,

C00h to FFFh.

The device writes the contents of ANC packets into the FIFO, starting with the first

Ancillary Data Flag (ADF), followed by up to 1024 words.

All Data Identification (DID), Secondary Data Identification (SDID), Data Count (DC), user

data, and checksum words are written into the device memory.

The device detects ancillary data packet DID's placed anywhere in the video data

stream, including the active picture area.

In HD and 3G mode, ancillary data from the Y channel or Data Stream 1 is placed in the

Least Significant Word (LSW) of the FIFO, allocated to the lower 8 bits of each FIFO

address.

Ancillary data from the C channel or Data Stream 2 is placed in the Most Significant Word

(MSW) (upper 8 bits) of each FIFO address.

Note: Please refer to the ANC insertion and Extraction Application Note (Doc ID:

GENDOC-053410), for discrete steps and example of Ancillary data extraction using the

GS3471.

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