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GS3281 Datasheet(PDF) 69 Page - Semtech Corporation

Part # GS3281
Description  3G-SDI Re-timing Cable Driver
PDF  97 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS3281 Datasheet(HTML) 69 Page - Semtech Corporation

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GS3281
Final Data Sheet
Rev.7
PDS-061453
January 2019
69 of 97
Semtech
Proprietary & Confidential
www.semtech.com
Output Configuration
23 to 27
RSVD
RSVD
15:0
R/W
0
Reserved - do not modify.
28
OUTPUT_
PARAM_CD_
SD_0
RSVD
15:13
R/W
0
Reserved - do not modify.
CFG_OUTPUT1_CD_
SD_PREEMPH_WIDTH
12:8
R/W
3
Configure the MADI/SD 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.
RSVD
7
R/W
0
Reserved - do not modify.
CFG_OUTPUT1_CD_
SD_PREEMPH_
PWRDWN
6R/W
1
Power down the MADI/SD 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).
CFG_OUTPUT1_CD_
SD_PREEMPH_AMPL
5:0
R/W
0
Configure the MADI/SD 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.
29
OUTPUT_
PARAM_CD_
SD_1
RSVD
15:14
R/W
0
Reserved - do not modify.
CFG_OUTPUT1_CD_
SD_DRIVER_SWING
13:8
R/W
17
Configure the MADI/SD rate amplitude
on cable driver output1 (SDO1) in
~28mVpp steps.
Functional Range = 9d to 31d
Precision Range = 20d to 26d
Default value = 23d (~800mVpp)
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
7:0
R/W
A0
Reserved - do not modify.
Table 5-3: Control Register Descriptions (Continued)
Addressh
Register
Name
Parameter Name
Bit
Slice
R/W
Reset
Valueh
Description



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