GS3281 datasheet(73/97 Pages) SEMTECH

73 / 97 page

GS3281

Final Data Sheet

Rev.7

PDS-061453

January 2019

73 of 97

Semtech

Proprietary & Confidential

www.semtech.com

OUTPUT_

PARAM_

CD_BYPASS_0

RSVD

15:13

R/W

Reserved - do not modify.

CFG_OUTPUT1_CD_



BYPASS_PREEMPH_



WIDTH

12:8

R/W

Configure the Bypass rate pre-emphasis

pulse width on cable driver output1

(SDO1).



Range: 0 to 15d.

Adjust the pre-emphasis pulse width to

better match the channel loss response

shape.



Note: In auto slew mode

(CTRL_OUTPUT1_AUTO_SLEW=1), the

slew rate is determined by the rate at

which the CDR is locked. If the CDR is

unlocked, the slew will default to Bypass

Slew. See Table 2-3 for Rise/Fall Times,

and Section 4.7.3 for more details on

output driver selection.

RSVD

R/W

Reserved - do not modify.

CFG_OUTPUT1_CD_



BYPASS_PREEMPH_



PWRDWN

6R/W

Power down the Bypass rate

pre-emphasis on cable driver output1

(SDO1)



0 = Pre-emphasis driver powered up

(pre-emphasis enabled).



1 = Pre-emphasis driver powered down

(pre-emphasis disabled).



Note: In auto slew mode

(CTRL_OUTPUT1_AUTO_SLEW=1), the

slew rate is determined by the rate at

which the CDR is locked. If the CDR is

unlocked, the slew will default to Bypass

Slew. See Table 2-3 for Rise/Fall Times,

and Section 4.7.3 for more details on

output driver selection.

CFG_OUTPUT1_CD_



BYPASS_PREEMPH_



AMPL

5:0

R/W

Configure the Bypass rate pre-emphasis

amplitude on cable driver output1

(SDO1).



Range: 0 to 15d.

Adjust the pre-emphasis pulse

amplitude to better match the channel

loss at Nyquist.



Note: In auto slew mode

(CTRL_OUTPUT1_AUTO_SLEW=1), the

slew rate is determined by the rate at

which the CDR is locked. If the CDR is

unlocked, the slew will default to Bypass

Slew. See Table 2-3 for Rise/Fall Times,

and Section 4.7.3 for more details on

output driver selection.

Table 5-3: Control Register Descriptions (Continued)

Addressh

Name

Parameter Name

Bit

Slice

R/W

Reset

Valueh

Description

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