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AR# 15837

12.1 Timing - Path Tracing Control (PTC) warnings are reported: "Timing 2498/2695"

Description

When I use PTC (Path Tracing Control) applied to a time group that is constructed from BELs, warnings similar to the following occur:  

 

"WARNING:Timing:2498 - Path Tracing Control TIMEGRP "latch_4" ENABLE = "lat_d_q" ; contains items that are not components. These items will be ignored." 

"WARNING:Timing:2498 - Path Tracing Control TIMEGRP "latch_3" ENABLE = "lat_d_q" ; " 

"WARNING:Timing:2695 - Path Tracing Control TIMEGRP "TG_ASYNCRESET" ENABLE=reg_sr_q; contains items that are not components. These items will be ignored."

Solution

For PTC to be utilized, time groups must be constructed from COMPs, not BELs. Timing Analyzer cannot currently apply path tracing controls to BELs because PTCs are implemented on a per-delay basis. Since delays occur at the COMP level, they cannot be successfully applied to BELs.

AR# 15837
Date Created 09/03/2007
Last Updated 05/15/2014
Status Archive
Type General Article