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AR# 15148

Virtex-II Pro, RocketIO - Will different settings for TX_PREEMPHASIS and TX_DIFF_CTRL affect power consumption?


The Virtex-II Pro "DC and Switching Characteristics" data sheet states values for power consumption given several different data rates. Will different settings for TX_PREEMPHASIS (pre-emphasis control) and TX_DIFF_CTRL (differential swing control) affect these specifications? If so, how? 


Data sheets for all Xilinx devices are available at: 



The power specifications assume the use of the default settings: 10% pre-emphasis and 500 mV single-ended swing. With each increase of pre-emphasis (the settings are 10%, 20%, 25%, or 33%), the current draw on VTTX will increase by a maximum of 2 mA. With each 100 mV increase in single-ended swing (the settings are 400 mV, 500 mV, 600 mV, 700 mV, or 800 mV), the current draw on VTTX will increase by a maximum of 3 mA. 


The above information does not depend on data rate.

AR# 15148
Date Created 09/03/2007
Last Updated 05/14/2014
Status Archive
Type General Article