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AR# 36259

Timing - Disabling PTC "lat_d_q", Data to Output Transparent Latch

Description

When I run Timing Analysis, PTC (Path Tracing Control)optionlat_d_q is disabled and latches are treated as transparent. Now, when I enable PTC, lat_d_q, latches should be treated as synchronous. But, when I look at the timing report I see that both paths to the latches and through the latches are reported.

Solution

This is expected behavior. When you enable the PTC option, both sets of information are reported.

Essentially, the tools report both options.

AR# 36259
Date Created 06/17/2010
Last Updated 11/12/2012
Status Active
Type General Article
Tools
  • ISE Design Suite - 11.1
  • ISE Design Suite - 11.2
  • ISE Design Suite - 11.3
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  • ISE Design Suite - 11.4
  • ISE Design Suite - 11.5
  • ISE Design Suite - 12.1
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