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AR# 55035

Spartan-3A iMPACT Verify operation stops Readback CRC (POST_CRC) from running


POST_CRC will be stopped when iMPACT performs a Verify operation on a programmed Spartan-3A/-3AN/-3A DSP that has the POST_CRC feature enabled.

The reason that the POST_CRC function is stopped is because the iMPACT software Verify algorithm does not issue a DESYNC command. This command should be run at the conclusion of the operation to enable the POST_CRC feature.

This occurs in iMPACT version 14.x.


An optional work-around on Spartan-3A devices is to issue a Device Status Register read operation in iMPACT after the Verify operation to issue the DESYNC command.

AR# 55035
Date Created 03/21/2013
Last Updated 04/05/2013
Status Active
Type General Article
  • Spartan-3A
  • Spartan-3A DSP
  • Spartan-3AN