GS3590 datasheet(60/118 Pages) SEMTECH

60 / 118 page

GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

60 of 118

Semtech

Proprietary & Confidential

www.semtech.com

If signal loopback is required by the application, the Trace and Cable Drivers can be

active at the same time by setting CTRL_LOOPBACK_ENA to 1. Setting

CTRL_LOOPBACK_ENA to 1 overrides any setting in

CFG_TRDR_MUTE_WHEN_CABLE_DRIVER, but not the state settings configured in

Section 4.8.7.1 to Section 4.8.7.3.

4.8.8 Output Waveform Specifications

The Duty Cycle Distortion (DCD) of the serial digital differential outputs is less than 12ps.

DCD is defined as the difference in the width of an output logic “1” versus that of output

logic “0” as measured at the 50% point of the output waveform.

The DCD of the serial digital single ended outputs is less than 30ps.

Figure 4-22: Traditional Waveform Definition of DCD

4.9 GPIO Controls

There are four configurable GPIO pins which can independently be configured as inputs

or outputs. Each GPIO has a default function which can be re-configured through the

host interface.

If there is a conflict between the internal register configuration of a given device

function and the logic-level applied to a GPIO pin that is configured to control that same

device function, the GPIO logic-level takes precedence over the internal register

configuration. The logic HIGH and LOW levels of the GPIO[3:0] pin to which LOS is

connected are specified by the EIA/JESD8-5A standard for 1.8V operation.

For a list of available functions and configuration details of GPIO[3:0], please refer to the

GPIO Configuration Registers in Section 5.

50% point

high

low

DCD

waveform = thigh - tlow

GS3590 Datasheet(PDF) 60 Page - Semtech Corporation