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AR# 51910

14.x iMPACT - PROM File Formatter - Cannot create .mcs file for the XC3S50AN in PROM File Formatter


When attempting to create a .mcs file for XC3S50AN in PROM File Formatter from iMPACT 14.2, I see the following error:

ERROR:Bitstream:25 - 0xd5ae bytes loaded up from 0x0 would exceed promsize 0x8000.

This is an issue in iMPACT from version 14.2. It will be resolved in a future release.


To work around this issue, there are two options:

1. Roll back to a previous version of the software.

2. Use PROMgen to create the .mcs file, for instance: 

       promgen -p mcs -c FF -o SP3AN -spi -u 0 top.bit

This issue will be resolved in a future release of software.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
47890 14.x iMPACT - Known Issues for the iMPACT 14.x tools N/A N/A
AR# 51910
Date Created 09/27/2012
Last Updated 03/18/2013
Status Active
Type General Article
  • Spartan-3AN
  • ISE Design Suite - 14.2
  • ISE Design Suite - 14.3
  • ISE Design Suite - 14.4