Description

When I run MAP on a Virtex-5 design that I have synthesized using Synplify or Synplify Pro, the following error occurs: 

" FATAL_ERROR:Pack:pkibaexception.c:198:1.5 - Failed to program a device usage 

model for comp "SRX_SYNC_P". The comp is an instance of type IOB. The 

following configuration string was used to program the device usage model:  

DIFFI_INUSED:0 DIFF_TERM:true IMUX:I Exception text: MRBCF IOB Failure: 

INVALID_MODERB: "DIFF_TERM" CFG: "DIFFI_INUSED:0 DIFF_TERM:true IMUX:I"  

Process will terminate. For more information on this error, please consult 

the Answers Database or open a WebCase with this project attached at 

http://www.xilinx.com/support."
 

What is causing this error and how can I get around it? 

NOTE: This is only a good match if the message contains the string "DIFF_TERM:true " and synthesis for a Virtex-5 design was done with Synplify or Synplify Pro.

Solution

This error is caused by MAP incorrectly considering case sensitivity in the value of the DIFF_TERM attribute. This will be fixed in the upcoming 10.1i release.  

In the meantime, to work around this issue, change the value in the edif from true to TRUE.