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.

       -stats 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

       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)

Anthony Bybell                      1.3.34                          VCD2LXT(1)