User guide

7-13
VCD and VPD File Utilities
The vcat Utility Syntax
The vcat utility has the following syntax:
vcat VCD_filename [-deltaTime] [-raw] [-min time] [-max time]
[-scope instance_name] [-level level_number]
[-include filename] [-ignore filename] [-spikes] [-noalpha]
[-wrapsize size] [-showmasters] [-showdefs] [-showcodes]
[-stdin] [-vgen]
Here:
-deltaTime
Specifies writing simulation times as the interval since the last
value change rather than the absolute simulation time of the signal
transition. Without -deltaTime a vcat output looks like this:
--- TEST_top.TEST.U4._G002 ---
0 x
33 0
20000 1
30000 x
30030 z
50030 x
50033 1
60000 0
70000 x
70030 z
With -deltaTime a vcat output looks like this:
--- TEST_top.TEST.U4._G002 ---
0 x
33 0
19967 1
10000 x
30 z
20000 x
3 1
9967 0