GS2986 datasheet(24/41 Pages) SEMTECH

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GS2986 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

52134 - 3

July 2012

24 of 41

The AUTOBYPASS function will bypass unsupported (non-reclocked) SMPTE SDI signal rates

without producing bit errors: 143Mb/s, 177Mb/s, 360Mb/s, 540Mb/s.

4.13 DVB-ASI

The GS2986 also reclocks DVB-ASI signals at 270Mb/s. In auto mode, the device will

automatically lock to the incoming 270Mb/s signal. In manual mode, the SS[1:0] pins must be set

to 01 (270Mb/s) to ensure proper operation.

4.14 Output Mute and Data/Clock Output Selection

The DATA_MUTE register is provided to allow muting of the serial digital data output.

Setting DATA_MUTE = LOW will force the serial digital outputs DDO/DDO to mute (statically

latch HIGH) under all conditions and operating modes.

The DDO1_DISABLE pin is provided to allow the second data/clock output to be powered

down.

When DDO1_DISABLE is set LOW, the serial digital clock outputs DDO1/RCO and DDO1/RCO

are muted and the driver is powered-down.

The DATA/CLOCK register is provided to allow the second output to emit a copy of the

reclocked serial data or the recovered clock. In Legacy mode, the default is DATA output.

4.15 Host Interface

4.15.1 Introduction

The GS2986 offers a Serial Peripheral Interface (SPI) to access advanced features and

programmability. The polarity of the HIF pin tells the GS2986 whether or not the host interface

is active (HIF = 0) or in legacy mode (HIF = 1).

Using the host interface, it is possible to override the control pin settings, and such settings will

persist until the device has been powered-down and/or reset. The host interface is capable of

Table 4-9: Configuration of GS2986 Output Drivers and Mute/Disable Pins

DATA_MUTE

DDO1_DISABLE

DATA/CLOCK

DDO0

DDO1/RCO

110

DATA

CLOCK

DATA

010

MUTE

CLOCK

MUTE

DATA

Power down

MUTE

Power down

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