GS3281 datasheet(41/97 Pages) SEMTECH

41 / 97 page

GS3281

Final Data Sheet

Rev.7

PDS-061453

January 2019

41 of 97

Semtech

Proprietary & Confidential

www.semtech.com

4.7.5 Output State Control Modes

The GS3281 provides several output state control modes to meet specific application

requirements. The cable driver has the following three output modes: operational,

muted, disabled, or balanced. During non-sleep, if the control modes are configured

such that multiple output modes are enabled, the priorities of the control modes from

highest to lowest are the following: balanced, disabled, and then muted.Section 4.7.5.1

through Section 4.7.5.3 describe how to configure the output control modes that are

enabled during non-sleep. If the device enters sleep, either manually or automatically,

the sleep output control modes take precedence over the non-sleep control modes. The

default cable driver configuration is for it to be disabled during sleep; however the cable

driver can be configured to mute during sleep by setting the

CFG_SLEEP_OUTPUT<n>_MUTE parameter in register 0x5 to 1b.

4.7.5.1 Output Mute Control Mode

Each of the outputs on the GS3281 have independent mute control modes, which can

be configured through the host interface.

The following are the four output mute control modes:

1. The outputs automatically mute on LOS (default).

2. The outputs automatically mute on LOS and during rate search.

3. The outputs never mute.

4. The outputs are always muted.

The first mute control mode is the default power-up configuration for both output

drivers (the CTRL_OUTPUT<n>_AUTO_MUTE control parameter in register 0x49 is set

to 1b). In this mode, the outputs will automatically mute on the assertion of LOS. In

addition to mute on LOS, with auto mute control mode configured, setting the

CTRL_OUTPUT<n>_AUTO_MUTE_DURING_RATE_SEARCH control parameter in

and begins to rate search.

0x30/0x32

OUTPUT_ PARAM_

CD_BYPASS_0/

OUTPUT_ PARAM_

CD_BYPASS_2

CFG_OUTPUT<n>_CD_BYPASS_

PREEMPH_WIDTH

Output pre-emphasis pulse width configuration parameter.

<n> = 0: For Bypass on SDO0.



<n> = 1: For Bypass on SDO1.

CFG_OUTPUT<n>_CD_BYPASS_

PREEMPH_PWRDWN

Output pre-emphasis power down configuration parameter.

<n> = 0: For Bypass on SDO0.



<n> = 1: For Bypass on SDO1.

CFG_OUTPUT<n>_CD_BYPASS_

PREEMPH_AMPL

Output pre-emphasis pulse amplitude configuration parameter.

<n> = 0: For Bypass on SDO0.



<n> = 1: For Bypass on SDO1.

Table 4-8: Output Swing and Pre-Emphasis Control Parameters (Continued)

Addressh

Parameter Name

Description

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