GS12341 datasheet(47/109 Pages) SEMTECH

47 / 109 page

GS12341

Final Data Sheet

Rev.1

PDS-061928

August 2019

47 of 109

Semtech

Proprietary & Confidential

www.semtech.com

4.7.5 Trace Driver DC coupling requirements

Table 4-9 lists the required Vcco (Driver Supply voltage) and DS (Driver Swing) required

to achieve three common nominal VDDOppd (peak-to-peak differential output voltages)

and their associated nominal Vcmout (output common mode voltage).

In the DC-coupled case, where Vcco is connected to the same supply as the input buffer

supply voltage of the downstream device, Vcmount in Table 4-9 is the common mode

voltage at the output of the GS12341 driver. For short low loss transmission lines, this

will also be the common mode voltage created at the input termination of the

downstream input buffer. However, for long and lossy transmission lines, the amplitude

will be attenuated at the downstream receiver and therefore the common mode

voltage created at the input termination will be higher and must be measured or

simulated for accuracy. For proper link operation, the common mode voltage created at

the input termination of the downstream input buffer must be within the Vcmin range

specified by that device.

35/37

OUTPUT_ PARAM_

TD_6G_1/

OUTPUT_ PARAM_

TD_6G_3

CFG_OUTPUT<n>_TD_6G_

DRIVER_SWING

Output amplitude configuration parameter for 6G on DDO0 and

DDO1, where <n> is the output number.

34/36

OUTPUT_ PARAM_

TD_6G_0/

OUTPUT_ PARAM_

TD_6G_2

CFG_OUTPUT<n>_TD_6G_

PREEMPH_WIDTH

Output pre-emphasis pulse width configuration parameter for

6G on DDO0 and DDO1, where <n> is the output number.

CFG_OUTPUT<n>_TD_6G_

PREEMPH_PWRDWN

Output pre-emphasis power down configuration parameter for

6G on DDO0 and DDO1, where <n> is the output number.

CFG_OUTPUT<n>_TD_6G_

PREEMPH_AMPL

Output pre-emphasis pulse amplitude configuration parameter

for 6G on DDO0 and DDO1, where <n> is the output number.

39/3B

OUTPUT_ PARAM_

TD_12G_1/

OUTPUT_ PARAM_

TD_12G_3

CFG_OUTPUT<n>_TD_12G_

DRIVER_SWING

Output amplitude configuration parameter for 12G on DDO0

and DDO1, where <n> is the output number.

38/3A

OUTPUT_ PARAM_

TD_12G_0/

OUTPUT_ PARAM_

TD_12G_2

CFG_OUTPUT<n>_TD_12G_

PREEMPH_WIDTH

Output pre-emphasis pulse width configuration parameter for

12G on DDO0 and DDO1, where <n> is the output number.

CFG_OUTPUT<n>_TD_12G_

PREEMPH_PWRDWN

Output pre-emphasis power down configuration parameter for

12G on DDO0 and DDO1, where <n> is the output number.

CFG_OUTPUT<n>_TD_12G_

PREEMPH_AMPL

Output pre-emphasis pulse amplitude configuration parameter

for 12G on DDO0 and DDO1, where <n> is the output number.

Table 4-8: Output Swing and Pre-Emphasis Control Parameters (Continued)

and Name

Parameter Name

Description

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