User guide

D-13
Compiler Directives and System Tasks
$dumpon
Starts recording value change information in the VCD file. See
IEEE std 1364-2001 page 326.
$dumpfile
Specifies the name of the VCD file you want VCS to record.
Syntax:
$dumpfile("filename");
$dumpflush
Empties the VCD file buffer and writes all this data to the VCD
file. See IEEE std 1364-2001 page 328.
$dumplimit
Limits the size of a VCD file. See IEEE std 1364-2001 page 327.
$dumpvars
Specifies the nets and registers whose transition times and values
you want VCS to record in the VCD file. See IEEE std 1364-2001
page 325-326.
Syntax:
$dumpvars(level_number,module_instance |
net_or_reg);
You can specify individual nets or registers or specify all the nets
and registers in an instance.
$dumpchange
Tells VCS to stop recording transition times and values in the
current dump file and to start recording in the specified new file.
Syntax:
$dumpchange("filename");
Code example:
$dumpchange("vcd16a.dmp");