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AR# 55840

RXAUI v3.0 - Update to RX termination for 7 Series GTP and GTH Transceivers

Description

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.

Solution

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
AR# 55840
Date Created 05/02/2013
Last Updated 05/09/2013
Status Active
Type General Article
IP
  • RXAUI