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AR# 55840: RXAUI v3.0 - Update to RX termination for 7 Series GTP and GTH Transceivers
RXAUI v3.0 - Update to RX termination for 7 Series GTP and GTH Transceivers
If using the RXAUI core v3.0 and earlier to target Artix-7 or Virtex-7 devices with GTP or GTH transceivers, the RX termination is set to GND while the latest recommendation in the GTP transceiver Users Guide is to set the RX termination for CEI-6 to AVTT, and in the GTH transceiver User Guides is to set the RX termination to programmable 800 mV. If using the GTX transceiver, the termination is already set to programmable 800 mV.
To change the RX termination to AVTT for Artix-7 GTP transceiver:
in the core_name_gt_gtwizard_gt.v/vhd file, change to use the following settings: RX_CM_SEL[1:0] = 2'b00 RXLPM_INCM_CFG = 1'b1 RXLPM_IPCM_CFG = 1'b0
To change the RX termination to 800mV for Virtex-7 GTH transceiver:
in the core_name_gt_gtwizard_gt.v/vhd file, change to use the following settings: RX_CM_SEL [1:0] = 2'b11 RXDFEAGCTRL.[4:3] to 2'b10 RX_CM_TRIM = 4'b1010
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