User guide

14-1
Negative Timing Checks
14
Negative Timing Checks 1
Negative timing checks are either $setuphold timing checks with
negative setup or hold limits, or $recrem timing checks with negative
recovery or removal limits.
This chapter describes their purpose, how they work, and how to use
them in the following sections:
• The Need for Negative Value Timing Checks
• The $setuphold Timing Check Extended Syntax
• The $recrem Timing Check Syntax
• Enabling Negative Timing Checks
• Checking Conditions
• Toggling the Notifier Register
• SDF Backannotation to Negative Timing Checks