GS3590 datasheet(59/118 Pages) SEMTECH

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GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

59 of 118

Semtech

Proprietary & Confidential

www.semtech.com

4.8.7.2 Output Disable Control Mode

Each of the outputs on the GS3590 also have independent disable control modes, which

can be configured through the host interface.

The following are the three output disable control modes:

1. The outputs are never disabled (default).

2. The outputs are automatically disabled on LOS.

3. The outputs are always disabled.

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

drivers (the CTRL_OUTPUT<n>_AUTO_DISABLE and

CTRL_OUTPUT<n>_MANUAL_DISABLE control parameters in register 0x49 are both

set to 0b). In this mode, the outputs will never disable. By setting the

CTRL_OUTPUT<n>_AUTO_DISABLE control parameter in register 0x49 to 1b, the

outputs will automatically disable on the assertion of LOS. This includes LOS as a result

of setting up Squelch Adjust (see Section 4.2.3 for more details).

The output can be manually disabled by leaving the

CTRL_OUTPUT<n>_AUTO_DISABLE control parameter set to 0b and setting the

CTRL_OUTPUT<n>_MANUAL_DISABLE control parameter to 1b.

The disable control mode takes precedence over the output mute control mode.

4.8.7.3 Output Balanced Control Mode

The GS3590 has a feature designed to facilitate reliable Output Return Loss (ORL)

measurements on SDIO/SDO while the device is still powered. The device can be put into

BALANCE mode which prevents the outputs from toggling while ORL is being

measured. BALANCE mode can be enabled through the host interface, by setting

control parameter CTRL_OUTPUT0_BALANCED in register 4Dh to 1b. This control is

solely for the Cable Driver output. This control mode takes precedence over both the

output mute and output disable control modes.

4.8.7.4 Loopback Control

Section 4.8.7.1 to Section 4.8.7.3 describe the output state configuration settings for the

outputs when they are operating in their default mode. That is, they describe the Trace

Driver settings when the device is in Cable Equalizer Mode and the Cable Driver settings

when the device is in Cable Driver Mode.

In Cable Driver Mode, the Trace Driver is inactive by default, and its inactive state

settings are controlled by a separate parameter to the ones mentioned in Section 4.8.7.1

to Section 4.8.7.3. In Cable Driver Mode, the Trace Driver state is controlled by the

CFG_TRDR_MUTE_WHEN_CABLE_DRIVER parameter. The default setting of this

parameter is 0, and the Trace Driver is disabled. The inactive state can be changed to

powered-up and muted by setting CFG_TRDR_MUTE_WHEN_CABLE_DRIVER to 1.

GS3590 Datasheet(PDF) 59 Page - Semtech Corporation

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