GS3590 datasheet(19/118 Pages) SEMTECH

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GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

19 of 118

Semtech

Proprietary & Confidential

www.semtech.com

The CTRL_AUTO_SLEEP and CTRL_MANUAL_SLEEP parameters in register 0x3,

control the sleep mode of the device. The default value of the CTRL_AUTO_SLEEP

parameter is 1b (Auto Sleep). While in Auto Sleep Mode, the CTRL_MANUAL_SLEEP

parameter has no effect. To enable host control of the sleep mode, set the

CTRL_AUTO_SLEEP parameter to 0b for Manual Sleep Control. To prevent the device

from entering sleep, set the CTRL_MANUAL_SLEEP parameter to 0b (not sleep). To

manually configure the device to sleep, set the CTRL_MANUAL_SLEEP parameter to 1b

(sleep).

The device can also be manually made to sleep through the GPIO pins. The default GPIO

pin to control sleep is GPIO2 (pin 33). Drive this pin HIGH to make the device sleep.

Section 4.7 describes the PRBS Generator function. If the device's PRBS Generator is

intended to be used without a valid input signal, the device should be manually set to

not sleep as described above. Without a valid input signal, an LOS status will be

generated and the device will enter sleep mode and the PRBS block will be disabled. For

a description of LOS thresholds and settings, see Section 4.2.3 and Section 4.3.2.

4.2 Cable Equalizer

When the GS3590 is operating in Cable Equalizer Mode, it can automatically adjust its

gain to equalize and restore SMPTE-compliant signals received over different lengths of

coaxial cable having loss characteristics similar to Belden 8281 or 1694A. With the

default settings, the device will automatically equalize MADI at 125Mb/s and most

common SMPTE compliant signals between SD at 270Mb/s and 3G-SDI at 2.97Gb/s and

bypass signals below 125Mb/s.

The GS3590 features programmable Launch Swing Compensation, Squelch Threshold

Adjust, and Bypass, all of which can be set through the device's host interface.

The equalized or bypassed signal is then routed to the serial digital re-timer (CDR) block.

4.2.1 Cable Equalizer Bypass

With the default settings, the device will automatically bypass signals below 125Mb/s.

During Equalizer Bypass Mode, the device supports low data rate and slow edge signals

such as SMPTE310 and AES3id. The rise/fall times must not exceed 62ns. These signals

will not be re-timed by the CDR block. The following two methods allow the user to

force the signal to bypass the equalization and DC restoration stages:

1. Via the host interface, by setting CTRL_CEQ_AUTO_BYPASS to 0b, and

CTRL_CEQ_MANUAL_BYPASS to 1b in register 0x17.

2. Via the GPIO[0:3] pin (see Section 4.9).

GS3590 Datasheet(PDF) 19 Page - Semtech Corporation

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