User guide

6-23
VPD and EVCD File Generation
$vcdplusdeltacycleoff
The $vcdplusdeltacycleoff task turns off reporting of delta
cycle information starting at the next sample time.
Glitch detection is automatically turned off when VCS executes
$vcdplusdeltacycleoff unless you have previously used
$vcdplusglitchon/off. Once you use $vcdplusglitchon/
off, DVE allows you explicit control of glitch detection.
Syntax:
$vcdplusdeltacycleoff;
System Tasks for Capturing Unique Event Information
You can use the following VPD system tasks to capture unique events
and glitch information.
$vcdplusglitchon
The $vcdplusglitchon task turns on checking for zero delay
glitches and other cases of multiple transitions for a signal in one
sample time. Glitch detection is automatically turned on when VCS
executes $vcdplusdeltacycleon unless you have previously
used $vcdplusglitchon/off. Once you use
$vcdplusglitchon/off, DVE allows you explicit control of glitch
detection.
When VCS detects a glitch for a signal, it records a zero delay glitch
event. The default setting is not to perform zero delay glitch detection.
Syntax:
$vcdplusglitchon;