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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.

However, the latest recommendation in the GTP and GTH transceiver User Guides is to set the RX termination to 800 mV.

When using the GTX transceiver, the termination is already set to 800 mV.

Solution

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

Update the core_name_v7_gtwizard_gt.v[hd] file 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 a Virtex-7 GTH transceiver:

Update the core_name_v7_gtwizard_gt.v[hd] file 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 04/25/2017
Status Active
Type General Article
Devices
  • Artix-7
  • Virtex-7
IP
  • CPRI