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# 37461

PlanAhead Design Assistant - What is the difference between timing results from TRCE and PlanAhead Timing Analysis?


PlanAhead has two different method for viewing timing results. With a Netlist or RTL Design loaded, I can access PlanAhead's timing engine with the Analyze Timing button. With an Implemented Design, I can view Timing Results from TRCE. Why does PlanAhead have both of these timing results and when should I use them?

Note: This Answer Record is a part of the Xilinx PlanAhead Solution Center (Xilinx Answer 37100). The Xilinx PlanAhead Solution Center is available to address all questions related to PlanAhead. Whether you are starting a new design with PlanAhead or troubleshooting a problem, use the PlanAhead Solution Center to guide you to the right information.


PlanAhead's timing engine provides pre and post synthesis timing estimation. This is intended to provide an initial idea of potential critical paths and to assist with floorplanning. This usually takes place during the first part of the timing closure phase.

The TRCE results represent sign off timing and, if done post-route, will show the complete component and routing delays.

For more information on Timing Closure with PlanAhead, please see (Xilinx Answer 37457).
AR# 37461
Date Created 08/16/2010
Last Updated 08/16/2010
Status Active
Type General Article