[Gtkwave-users] lxt2vcd doesn't seem to work correctly

[Ron B. <rbu...@ea...>]

I'm having a problem with lxt2vcd.  I apologize if this is the wrong 
place to post about it.  I've experienced this problem both with gtkwave 
v3.66 from the Linux Mint repositories, and with 3.95 built from source.

The problem is that while lxt2vcd produces a usable vcd file, and most 
of the waveforms in it look okay, there are nevertheless some distorted 
waveforms in it.  You can access the files needed to see and reproduce 
the problem at this google drive link: 
https://drive.google.com/open?id=1RUjadnRVZh-j5qUeCRSArFUmvUjiwXi_

Specifically, I am running a simulation using Icarus Verilog's vvp 
program (that's the file named "lxt2vcdbug.vvp" in the folder linked 
above), from which I produce an lxt2 file ("lxt2_from_vvp.lxt2"), which 
I would then like to convert to vcd using lxt2vcd.  The vcd file I get 
from doing so is "vcd_from_lxt2vcd.vcd".  The specific signals I'm 
interested in within the lxt2 or vcd file are called "main.AGC.T01_n" 
through "main.AGC.T12_n".  There's a screenshot ("lxt2vcdbug.png") that 
shows both of these in gtkwave. The lxt2 trace is at the top, and the 
vcd produced by lxt2vcd is at the bottom.  (In the middle, just for 
thoroughness, is a native vcd file produced directly by vvp.)

Help!

--Ron