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vcd2lxt

VCD2LXT(1)							Filetype Conversion							VCD2LXT(1)

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)

Anthony Bybell							      1.3.34								VCD2LXT(1)