GS2970 Datasheet, PDF (28/145 Pages) Semtech Corporation – 3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing

4. Detailed Description
Refer to the document entitled GS2970/GS2971 Errata for this device (document
number 53092).
4.1 Functional Overview
The GS2970 is a multi-rate, multi-standard receiver with integrated SMPTE video
processing as well as an integrated audio de-embedder, compliant with SMPTE 425M,
SMPTE 424M, SMPTE 292 and SMPTE 259M-C signals. When used in conjunction with
Gennum's 3Gb/s-capable equalizers, a complete receive solution that supports full
bandwidth 1080p video at 2.97Gb/s can be realized.
The GS2970 includes an integrated reclocker, serial data loop through output, robust
serial-to-parallel conversion, integrated SMPTE video processing, and additional
processing functions such as audio extraction, ancillary data extraction, EDH support,
and DVB-ASI decoding.
The device supports four distinct modes of operation that can be set through external
device pins or by programming internal registers through the host interface; SMPTE
mode, Data-Through mode, DVB-ASI mode and Standby mode.
In SMPTE mode, all video processing features, ancillary data extraction, and audio
de-embedding features are enabled by default.
In DVB-ASI mode, the GS2970 carries out 8b/10b decoding and generates 10-bit parallel
DVB-ASI compliant data.
In Data-Through mode, the device operates as a simple serial to parallel converter. No
additional processing features are enabled.
Standby mode is the low power consumption mode of the device. In this mode, the
internal reclocker will unlock, and the internal configuration registers will not be
accessible through the host interface.
The GS2970 includes a JTAG interface for boundary scan testing.
4.2 SMPTE 425M Mapping - 3G Level A and Level B Formats
4.2.1 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 GS2970. See Figure 4-1:
Data Stream 1
EAV
Data Stream 2
HANC
SAV
Figure 4-1: Level A Mapping
GS2970 3Gb/s, HD, SD SDI Receiver Complete with
SMPTE Audio and Video Processing
Data Sheet
47478 - 4
September 2012
Active Video
28 of 145