File format:vcd

vcd

Name	Value change dump
Status	supported
Source code (in)	vcd.c
Source code (out)	vcd.c
Common extension(s)	.vcd, .wave
MIME type	—
ASCII format	yes
Compression	yes (only stores transitions)
Website	wikipedia.org

vcd is an ASCII-based file format that...

It can be opened and processed e.g. in a waveform viewer software.

Format

See Wikipedia for a short overview.

Examples

$date Fri Aug  1 23:46:38 2014 $end
$version libsigrok 0.3.0 $end
$comment
  Acquisition with 2/8 channels at 500 kHz
$end
$timescale 1 us $end
$scope module libsigrok $end
$var wire 1 ! sda $end
$var wire 1 " scl $end
$upscope $end
$enddefinitions $end
#0 1! 0"
#40 0!
#72 1"
#102 1!
#144 0!
#174 0"
#204 1!
#246 0!
#276 1"
#306 1!
#348 0!
#380 0"
#410 1!
#452 0!
#514 1!
#566 0!
#628 1!
#668 0!
#730 1!
#770 0!
#832 1!
#872 0!
#938 1!
#978 0! 1"
#1010 0"
#1040 1!
[...]
#106772 1!
#106812 0!
#106844 0"
#106874 1!
#106914 1"
#160000

Resources

• Wikipedia: Value change dump
• beyondttl.com: Value Change Dump (VCD)