UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 55863

CPRI for ISE 14.4 Update to RX termination for 7 Series GTP and GTH

Description

If using the CPRI for ISE 14.4 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 800 mV. If using the GTX transceiver the termination is already set to 800 mV.

Solution

To change the RX termination to 800 mV for Artix-7 GTP transceiver:

  • in the core_name_v7_gtwizard_gt.v[hd] 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 800 mV for Virtex-7 GTH transceiver:

  • in the core_name_v7_gtwizard_gt.v[hd] file, change to use the following settings:
    RX_CM_SEL [1:0] = 2'b11
    RX_CM_TRIM = 4'b1010

Linked Answer Records

Associated Answer Records

AR# 55863
Date Created 05/03/2013
Last Updated 05/09/2013
Status Active
Type General Article
Devices
  • Artix-7
  • Virtex-7
IP
  • CPRI