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AR# 41876

13.1 - "FATAL_ERROR:Pack:pksbarouter.c:1967" when using DDR2 S and R Pins


The following error occurs during the packing phase of the map command:
"FATAL_ERROR:Pack:pksbarouter.c:1967:1.15 - An attempt was made to connect signals rst_100 and vid_in<1> to the same load pin. Process will terminate. For technical support on this issue, please open a WebCase with this project attached at http://www.xilinx.com/support."

What does it mean and what can be done to avoid it?


This error involves the S and R inputs of the IDDR2 and ODDR2 components. According to page 54 of the Spartan-6 FPGA SelectIO Resources User Guide (UG381), "Software will issue an error if both R and S are connected":

In this case, both were connected. Disconnecting the S pin overcomes the issue and the design then completes implementation.

The error handling is scheduled to be improved in ISE Design Suite13.3 so that a user error is printed rather than this cryptic fatal error.

Linked Answer Records

Associated Answer Records

AR# 41876
Date Created 08/17/2011
Last Updated 12/15/2012
Status Active
Type General Article
  • Spartan-6 LX
  • Spartan-6 LXT
  • Spartan-6Q