---
name: "fst2vcd"
section: "1"
platform: "linux"
package: "gtkwave"
version: "3.3.128-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/fst2vcd"
---

# fst2vcd(1)

Converts FST files to VCD

## NAME

fst2vcd - Converts FST files to VCD

## SYNTAX

fst2vcd \[*option*\]... \[*FSTFILE*\]

## DESCRIPTION

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

## OPTIONS

- **-f,--fstname** \<*filename*\>

  Specify FST input filename.

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

  Specify optional VCD output filename.

- **-e,--extensionsFr**

  **Emit FST extensions to VCD.  Enabling this may create VCD files unreadable by other tools.  This is generally intended to be used as a debugging tool when developing FST writer interfaces to simulators.**

- **-h,--help**

  Display help then exit.

## EXAMPLES

To run this program the standard way type:

- fst2vcd filename.fst

  The VCD conversion is emitted to stdout.

## AUTHORS

Anthony Bybell \<bybell@rocketmail.com\>

## SEE ALSO

[*vcd2fst*(1)](/vcd2fst/1.md) [*gtkwave*(1)](/gtkwave/1.md)