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AR# 55837

XAUI v11.0 - Update to RX termination for 7 Series GTP and GTH Transceivers

Description

If using the XAUI core v11.0 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 and GTH transceiver User Guides is to set the RX termination to programmable 800mV.  If using the GTX transceiver, the termination is already set to programmable 800 mV.

Solution

To change the RX termination to 800mV 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'b11
    RX_CM_TRIM = 4'b1010
    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

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
54666 LogiCORE IP XAUI - Release Notes and Known Issues for Vivado 2013.1 and newer tool versions N/A N/A

Associated Answer Records

AR# 55837
Date Created 05/02/2013
Last Updated 05/09/2013
Status Active
Type General Article
IP
  • XAUI