User guide

6-22
VPD and EVCD File Generation
Here:
level
The number of hierarchy scope levels to descend to stop
recording line tracing (a zero value stops the recording of all line
tracing to the end of the hierarchy; default is 1 level).
System Tasks for Capturing Delta Cycle Information
You can use the following VPD system tasks to capture and display
delta cycle information in the Wave Window.
$vcdplusdeltacycleon
The $vcdplusdeltacycleon task enables reporting of delta cycle
information from the VCS CLI or the Verilog source code. It must be
followed by the appropriate $vcdpluson/$vcdplusoff tasks.
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.
Syntax:
$vcdplusdeltacycleon;
Note:
Delta cycle collection can start only at the beginning of a time
sample. The $vcdplusdeltacycleon task must precede the
$vcdpluson command to ensure that delta cycle collection will
start at the beginning of the time sample.