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AR# 50663

ISE 13.4 Timing/Speed files - Analysis not matching hardware when external feedback is used.

Description

The timing analysis does not match the hardware measurements when external feedback is used.

Why does this happen?

Solution

There is a known issue where The DCM adjustment value does not compensate correctly for the full external feedback path. 

An ISE 13.4 tactical speed file patch is available to download from http://www.xilinx.com/txpatches/pub/swhelp/ise13_updates/ar50663_cr657761_timing_speed_files_13_4_o87xd_all.zip

AR# 50663
Date Created 07/03/2012
Last Updated 09/02/2014
Status Active
Type General Article
Devices
  • Spartan-6 LXT
  • Spartan-6 LX
Tools
  • ISE Design Suite - 13.4