GS3590 datasheet(47/118 Pages) SEMTECH

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GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

47 of 118

Semtech

Proprietary & Confidential

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4.8.3 PBRS Generator on SDIO and DDO

The Trace Driver and Cable Driver can be configured as a PRBS Generator. To select the

PRBS Generator on SDO1 ensure that the device is in cable driver mode and write 1b to

parameter CTRL_OUTPUT0_SIGNAL_SEL in register 0x48. The default value of this bit

is 0b (data mode). To select the PRBS Generator on DDO, ensure that the device is in

Trace Driver Mode and write 1b to parameter CTRL_OUTPUT1_SIGNAL_SEL in register

0x48. The default value of this bit is 0b (data mode).

To configure and enable the PRBS Generator, see Section 4.7 PRBS Generator.

4.8.4 Output Driver Data Rate Selection

The following information describes the default output driver configuration for each

operational mode, and how to modify them if required by the application.

Cable Driver Mode

In cable driver mode, with default settings active, the GS3590 uses the output driver and

slew rate group settings for the data rate to which the CDR is locked.

When the CDR is unlocked it will use the Bypass rate group:

 CFG_OUTPUT0_CD_BYPASS_DRIVER_SWING

 CFG_OUTPUT0_CD_BYPASS_PREEMPH_WIDTH

 CFG_OUTPUT0_CD_BYPASS_PREEMPH_AMPL

 CFG_OUTPUT0_CD_BYPASS_PREEMPH_PWRDWN

If required, manual selection of the output driver and slew rate group is possible using

the following steps:

1. Set CTRL_OUTPUT0_AUTO_SLEW = 0

2. Set CTRL_OUTPUT0_MANUAL_SLEW to the desired rate group. The slew rate

options are as follows:

0 = SD/MADI

1 = HD/3G

Trace Driver Mode

In trace driver mode, with default settings active, the GS3590 uses the SD trace driver

output group settings for all data rates, regardless of CDR lock condition or data rate

being applied.

The following parameters are used to control the output for all data rates in the default

condition:

 CFG_OUTPUT1_TD_SD_DRIVER_SWING

 CFG_OUTPUT1_TD_SD_PREEMPH_WIDTH

 CFG_OUTPUT1_TD_SD_PREEMPH_AMPL

 CFG_OUTPUT1_TD_SD_PREEMPH_PWRDWN

If required, per-rate selection of the trace driver output group setting is possible by

setting CTRL_OUTPUT1_TRDR_PER_RATE = 1. Once set, the trace driver output group

will be determined by the rate to which the CDR is locked.

GS3590 Datasheet(PDF) 47 Page - Semtech Corporation

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