Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Contact Us
Online Help
Domain Status
Man Pages

Virtual Servers

Topology Map

Server Agreement
Year 2038

USA Flag



Man Pages
VCD2LXT(1) Filetype Conversion VCD2LXT(1)

vcd2lxt - Converts VCD files to interlaced or linear LXT files

vcd2lxt [ VCDFILE] [LXTFILE] [option]...

Converts VCD files to interlaced or linear LXT files. Noncompressed interlaced files will provide the fastest access, linear files will provide the slowest yet have the greatest compression ratios.

Prints out statistics on all nets in VCD file in addition to performing the conversion.
Apply two-way subtraction algorithm in order to identify nets whose value changes by a constant XOR or whose value increases/decreases by a constant amount per constant unit of time. This option can reduce dumpfile size dramatically as value changes can be represented by an equation rather than explicitly as a triple of time, net, and value.
Emit data to file after being filtered through zlib (gzip).
Write out LXT in "linear" format with no backpointers. These are re-generated during initialization in gtkwave. Additionally, use libbz2 (bzip2) as the compression filter.
-dictpack <size>
Store value changes greater than or equal to size bits as an index into a dictionary. Experimentation shows that a value of 18 is optimal for most cases.

Note that you should specify dumpfile.vcd directly or use "-" for stdin.
vcd2lxt dumpfile.vcd dumpfile.lxt -clockpack -chgpack -dictpack 18
This turns on clock packing, zlib compression, and enables the dictionary encoding. Note that using no options writes out a normal LXT file.
vcd2lxt dumpfile.vcd dumpfile.lxt -clockpack -linear -dictpack 18
Uses linear mode for even smaller files.

Anthony Bybell <>

lxt2vcd(1) vcd2lxt2(1) gtkwave(1)
1.3.34 Anthony Bybell

Search for    or go to Top of page |  Section 1 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.