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AR# 58108: QSGMII v2.0 (Rev.1) and earlier - Update to RX termination for 7 Series GTH
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