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AR# 68131

2016.1 IBERT GTH - Unable to set PORT.GTTXRESET = 1

Description

After I program an IBERT GTH bitfile on a KCU105 board, and create the link with Near end PMA Loopback and set "LOGIC.RESETFSM_OVERRIDE= 1" and "PORT.GTTXRESET = 1", I see that "PORT.GTTXRESET" and "LOGIC.RESETFSM_OVERRIDE" values are toggling between 0 and 1 in the dashboard.

Because of this issue, Vivado hangs while trying to change the reset, or any other properties in the GUI.

Solution

To work around this issue, set GTTXRESET and RESETFSM_OVERRIDE back to 0.

As soon as both of the signals are set back to zero, the link status signal is set back to High.

Click on the TXRESET & RXRESET buttons in the SIO GUI to get clean data.

If the user is setting GTTXRESET and RESETFSM_OVERRIDE to 1, it is expected that after some time user will set back these signals to 0 to get the link back.

AR# 68131
Date 09/12/2017
Status Active
Type General Article
Devices
  • FPGA Device Families
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