NAME

       vcd2lxt - Converts VCD files to interlaced or linear LXT files

SYNTAX

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

DESCRIPTION

       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.

OPTIONS

       -stats Prints out statistics on all nets in VCD file in addition to performing the conversion.

       -clockpack
              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.

       -chgpack
              Emit data to file after being filtered through zlib (gzip).

       -linear
              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.

EXAMPLES

       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.

AUTHORS

       Anthony Bybell <bybell@rocketmail.com>

SEE ALSO

       lxt2vcd(1) vcd2lxt2(1) gtkwave(1)