User guide

17-25
VCD+ (vpd) File Generation
Note:
The buffer size automatically is increased as needed to comply
with the above limit.
+vpdfile to set the output file name
The vpdfile command allows specification of the output file name.
Syntax:
+vpdfile+xxx
Where xxx is the VCD+ filename (default is vcdplus.vpd). You
must include the full file name with the .vpd extension.
+vpdfilesize to control maximum file size
The +vpdfilesize command creates a VCD+ file, which has a
moving window in time while never exceeding a specified file size nn
megabytes. When the VCD+ file size limit is reached, VCD+ will
continue saving simulation history by overwriting older history.
File size is a direct result of circuit size, circuit activity, and the data
being saved. Test cases show that VCD+ file sizes will likely run from
a few megabytes to a few hundred megabytes. Many VirSim users
can share the same VCD+ history file, which may be a reason for
saving all time value changes when you do simulation. You can save
one history file for a design and overwrite it on each subsequent run.
Syntax:
+vpdfilesize+nn
Where nn is the file size in megabytes.