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AR# 58108

QSGMII v2.0 (Rev.1) and earlier - Update to RX termination for 7 Series GTH


If using the QSGMII core v2.0 (Rev.1) and earlier to target Virtex-7 devices with GTH transceivers, the RX termination is set to AVTT while the latest recommendation in the GTH transceiver User Guides is to set the RX termination to 800 mV if using DFE mode.


To change the RX termination to 800 mV for Virtex-7 GTH transceiver:

  • In the core_name_gth_gtwizard_gt.v/vhd file, change to use the following settings:
    RX_CM_SEL [1:0] = 2'b11
    RX_CM_TRIM = 4'b1010

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
54668 LogiCORE IP QSGMII - Release Notes and Known Issues for Vivado 2013.1 and Forward N/A N/A
AR# 58108
Date Created 10/23/2013
Last Updated 10/31/2013
Status Active
Type General Article