diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/ghdl.texi | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/doc/ghdl.texi b/doc/ghdl.texi index 4824cdf84..41785e505 100644 --- a/doc/ghdl.texi +++ b/doc/ghdl.texi @@ -1522,13 +1522,21 @@ Do not simulate, only elaborate. This may be used with design. @item --vcd=@var{FILENAME} +@item --vcdgz=@var{FILENAME} @cindex @option{--vcd} option +@cindex @option{--vcdgz} option @cindex vcd @cindex value change dump @cindex dump of signals -Dump into the VCD file @var{FILENAME} the signal values before each -non-delta cycle. If @var{FILENAME} is @samp{-}, then the standard output is -used, otherwise a file is created or overwritten. +@option{--vcd} dumps into the VCD file @var{FILENAME} the signal +values before each non-delta cycle. If @var{FILENAME} is @samp{-}, +then the standard output is used, otherwise a file is created or +overwritten. + +The @option{--vcdgz} option is the same as the @option{--vcd} option, +but the output is compressed using the @code{zlib} (@code{gzip} +compression). However, you can't use the @samp{-} filename. +Furthermore, only one VCD file can be written. @dfn{VCD} (value change dump) is a file format defined by the @code{verilog} standard and used by virtually any wave viewer. |