GS3470 datasheet(20/169 Pages) SEMTECH

20 / 169 page

GS3470

Final Data Sheet

Rev.8

PDS-060500

September 2017

20 of 169

Semtech

www.semtech.com

4. Detailed Description

4.1 Functional Overview

The GS3470 includes a dual serial digital input buffer with 2x2 MUX, an integrated

retimer, 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 serial digital input buffer with 2x2 MUX offers a lot of flexibility for use in default and

various Power-down modes. From Figure 4-1 below, the top two blocks shown

represent input select with loopback, while the bottom two allow input select with

separate loopback select.

Figure 4-1: Flexible Input Loopback

Expanded and configurable Power-down modes offer increased flexibility by selectively

enabling or disabling key features (such as CSR access, PCLK, retimed DDO loop-through

output, and non-retimed DDO loop-through output). Figure 4-2 show the various

Power-down modes.

PCLK

PDATA

Loop-through

of Input 1

DDI0

DDI1

Deserialized from

Input 1

PCLK

PDATA

Loop-through

of Input 2

Deserialized from

Input 2

PCLK

PDATA

Loop-through

of Input 2

Deserialized from

Input 1

PCLK

PDATA

Loop-through

of Input 1

Deserialized from

Input 2

GS3470

INPUT_CONFIG[3:2]=00b

DDI0

DDI1

INPUT_CONFIG[3:2]=01b

DDI0

DDI1

INPUT_CONFIG[3:2]=10b

DDI0

DDI1

INPUT_CONFIG[3:2]=11b

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