GS2960 datasheet(32/97 Pages) SEMTECH

32 / 97 page

GS2960 3Gb/s, HD, SD SDI Receiver Complete with

SMPTE Video Processing

Data Sheet

48003 - 6

September 2012

32 of 97

4.8 SMPTE Functionality

4.8.1 Descrambling and Word Alignment

The GS2960 performs NRZI to NRZ decoding and data descrambling according to SMPTE

424M/SMPTE 292/SMPTE 259M-C and word aligns the data to TRS sync words.

When operating in Manual mode (AUTO/MAN bit in the host interface is set LOW), the

device only carries out SMPTE decoding, descrambling and word alignment when the

SMPTE_BYPASS pin is set HIGH and the DVB_ASI pin is set LOW.

When operating in Auto mode (AUTO/MAN bit in the host interface is set HIGH), the

GS2960 carries out descrambling and word alignment to enable the detection of TRS

sync words. When two consecutive valid TRS words (SAV and EAV), with the same bit

alignment have been detected, the device word-aligns the data to the TRS ID words.

TRS ID word detection is a continuous process. The device remains in SMPTE mode until

TRS ID words fail to be detected.

NOTE 1: Both 8-bit and 10-bit TRS headers are identified by the device.

NOTE 2: In 3G Level B mode, the device only supports Data Stream 1 and Data Stream

2 having the same bit width (i.e. both data streams contain 8-bit data, or both data

streams contain 10-bit data). If the bit widths between the two data streams are different,

the GS2960 cannot word align the input stream, and remains in Data-Through mode.

GS2960 Datasheet(PDF) 32 Page - Semtech Corporation