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AR# 55367

Ethernet 1000BASE-X PCS/PMA or SGMI v13.0 and earlier - Update to RX termination for 7 Series GTP and GTH

Description

If using the Ethernet 1000BASE-X PCS/PMA or SGMII core v12.0 and earlier to target Virtex-7 devices with GTH transceivers or v13.0 and earlier to target Artix-7 devices with GTP 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_gtp_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 800 mV for Virtex-7 GTH transceiver:

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

Linked Answer Records

Master Answer Records

AR# 55367
Date Created 04/03/2013
Last Updated 08/30/2013
Status Active
Type General Article
IP
  • Ethernet 1000BASE-X PCS/PMA or SGMII