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AR# 37733

Spartan-6, ISE 12.2, DCM_CLKGEN - PROGDONE might not assert after changing the M and D values

Description

When using the Dynamic Reconfiguration of the M and D values of the DCM_CLKGEN, PROGDONE might not assert, or the M and D values might not be correctly reprogrammed.

Solution


This is a known issue with ISE 12.2 tools only and is scheduled to be fixed in ISE Design Suite 12.3.This worked properly prior to 12.2 as well.The issue is caused by the software tools incorrectly configurating the DCM while in DCLK_CLKGEN mode.
There is a work-around if this functionality is required in ISE Design Suite 12.2.For assistance with this work-around, contact Xilinx Technical Support by opening a WebCase and referencing this Answer Record:
http://www.xilinx.com/support/clearexpress/websupport.htm
This issue is fully resolved in ISE Design Suite 12.3.
AR# 37733
Date Created 09/10/2010
Last Updated 12/15/2012
Status Active
Type General Article
Devices
  • Spartan-6 LX
  • Spartan-6 LXT
Tools
  • ISE Design Suite - 12.2