---
name: "vzt2vcd"
section: "1"
platform: "linux"
package: "gtkwave"
version: "3.3.128-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/vzt2vcd"
---

# vzt2vcd(1)

Converts VZT files to VCD

## NAME

vzt2vcd - Converts VZT files to VCD

## SYNTAX

vzt2vcd \[*option*\]... \[*VZTFILE*\]

## DESCRIPTION

Converts VZT files to VCD files.  If an output filename is not specified, the VCD is emitted to stdout.

## OPTIONS

- **-v,--vztname** \<*filename*\>

  Specify VZT input filename.

- **-o,--output** \<*filename*\>

  Specify optional VCD output filename.

- **-f,--flatearth**

  Emit flattened hierarchies.

- **-c,--coalesce**

  Coalesce bitblasted vectors.

- **-n,--notruncate**

  Do not shorten bitvectors.  This disables binary value compression as described in the IEEE-1364 specification.  (i.e., all values except for '1' left propagate as a sign bit on vectors which do not fill up their entire declared width)

- **-h,--help**

  Display help then exit.

## EXAMPLES

To run this program the standard way type:

- vzt2vcd filename.vzt

  The VCD conversion is emitted to stdout.

## LIMITATIONS

*vzt2vcd* does not re-create glitches as these are coalesced together into one value change during the writing of the VZT file.

## AUTHORS

Anthony Bybell \<bybell@rocketmail.com\>

## SEE ALSO

[*vcd2lxt2*(1)](/vcd2lxt2/1.md) [*vcd2lxt*(1)](/vcd2lxt/1.md) [*lxt2vcd*(1)](/lxt2vcd/1.md) [*gtkwave*(1)](/gtkwave/1.md)