GS3471 datasheet(58/179 Pages) SEMTECH

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GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

58 of 179

Semtech

www.semtech.com

4.16.1 SMPTE ST 425 Mapping - 3G Level A and Level B Formats

4.16.1.1 Level A Mapping

Direct image format mapping - the mapping structure used to define

1080p/50/59.94/60 4:2:2 YCbCr 10 bit data, as supported by the GS3471. See

Figure 4-33.

Figure 4-33: Level A Mapping

4.16.1.2 Level B Mapping

The 2 x 292 HD SDI interface - this can be two distinct links running at 1.5Gb/s or one

3Gb/s link formatted according to SMPTE ST 292 on two 10-bit links (Y/C interleaved).

For 1080p/50/59.94/60 4:2:2 video formats, each link should be line-interleaved as per

SMPTE ST 372. See Figure 4-34:

Figure 4-34: Level B Mapping

The GS3471 distinguishes between Level A and Level B mappings at 3Gb/s. When Level

B data is detected, each 10-bit link is demultiplexed into its individual component

streams, and most video processing features, including error detection and correction

are enabled separately for Data Stream 1 and Data Stream 2 (Link A and Link B,

respectively).

Note: Audio demultiplexing and ancillary data extraction can only be enabled for one

link for 3Gb/s Level B data. Data Stream 1 or Data Stream 2 can be selected via the host

interface.

Data Stream 1

Data Stream 2

EAV

HANC

SAV

Active Video

Data Stream 1

(”Link A”)

Data Stream 2

(”Link B”)

EAV

HANC

SAV

Active Video

“double” TRS headers from

interleaved HD-SDI;

multiplexed Y/C data

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