UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 47643

13.x Spartan-6 - Post Config CRC error is always flagged when BitGen generated Readback signature is used

Description

Spartan-6 Post Configuration CRC checks will fail if the BitGen generated Readback signature is used, which happens immediately after configuration. This is default behavior unless the signature generated after the first readback is selected.

Solution

To work around this issue, you need to specify the signature as the value generated on the first readback of the device by the Post Configuration CRC logic. To do that, add the following constraint to your UCF file:

Config POST_CRC_SOURCE = FIRST_READBACK;

The design will need to be reimplemented from NGDBuild.

AR# 47643
Date Created 04/30/2012
Last Updated 09/28/2012
Status Active
Type General Article