vcd file size reduction

[thirunadha rao]

Hi,

Can someone please answer to my following question on vcd (value
change dump) file.

If i have a program to reduce a given vcd file size by 8-10%, can it
be useful ? Basically, my program takes a vcd file as an input and
produces another vcd file which is 8-10% less in size from original
vcd, without disturbing any siganl changes (events)? Can it be useful
?

Thanks and Reagards,
Thiru.

 

[Swapnajit Mittra]

thirunadh@yahoo.co.in (thirunadha rao) wrote in message news:<ff5b6e8.0405240307.269b5df5@posting.google.com>...

Hi,

Can someone please answer to my following question on vcd (value
change dump) file.

If i have a program to reduce a given vcd file size by 8-10%, can it
be useful ? Basically, my program takes a vcd file as an input and
produces another vcd file which is 8-10% less in size from original
vcd, without disturbing any siganl changes (events)? Can it be useful
?

Thanks and Reagards,
Thiru.

My personal opinion only: it will be far more useful, if someone can
create applicationsfor generating a compact waveform database (similar to
vpd, sst etc.) and reading it through a free waveform viewer.

- Swapnajit.
--
=-=-= 100% pure Verilog PLI - go, get it ! =-=-=
Principles of Verilog PLI -By- Swapnajit Mittra
Kluwer Academic Publishers. ISBN: 0-7923-8477-6
http://www.angelfire.com/ca/verilog/

 

[Anthony J Bybell]

mittra@juno.com (Swapnajit Mittra) wrote in message news:<57666134.0405241155.3c5a14c2@posting.google.com>...

My personal opinion only: it will be far more useful, if someone can
create applicationsfor generating a compact waveform database (similar to
vpd, sst etc.) and reading it through a free waveform viewer.

See the manpages that come with gtkwave-1.3.48. There are some
converters bundled with the viewer that compress when converting VCD
to LXT, LXT2, or VZT. Reader/writer APIs w/source exist for LXT2 and
VZT so those formats are easily portable to other tools if anyone
cares to, however they are unsuitable if glitch preservation is a
requirement.

-Tony


19 :/pub/z_vcd> ls -la *.vcd | awk '{print $5" "$9}'

27032317 boot_hermes.vcd
3458533 des.vcd
103013722 model1.vcd
56997861 model2.vcd
40383618 pr_MP_RESRV_fvt.vcd
10671444 sauc041619_0.vcd
1237363268 systema.vcd
26171501 trace.vcd
49212763 vtest_noX8.vcd



20 :/pub/z_vcd> ls -la *.vzt | awk '{print $5" "$9}'

259603 boot_hermes.vzt
68789 des.vzt
213569 model1.vzt
389163 model2.vzt
528457 pr_MP_RESRV_fvt.vzt
149339 sauc041619_0.vzt
6295941 systema.vzt
368278 trace.vzt
128729 vtest_noX8.vzt

 

[Narendran Kumaraguru Nath]

And ... can you throw some details on how you did achieve it?
Naren.


thirunadh@yahoo.co.in (thirunadha rao) wrote in message news:<ff5b6e8.0405240307.269b5df5@posting.google.com>...

Hi,

Can someone please answer to my following question on vcd (value
change dump) file.

If i have a program to reduce a given vcd file size by 8-10%, can it
be useful ? Basically, my program takes a vcd file as an input and
produces another vcd file which is 8-10% less in size from original
vcd, without disturbing any siganl changes (events)? Can it be useful
?

Thanks and Reagards,
Thiru.

 

[Ulf Samuelsson]

"thirunadha rao" <thirunadh@yahoo.co.in> skrev i meddelandet
news:ff5b6e8.0405240307.269b5df5@posting.google.com...

Hi,

Can someone please answer to my following question on vcd (value
change dump) file.

If i have a program to reduce a given vcd file size by 8-10%, can it
be useful ? Basically, my program takes a vcd file as an input and
produces another vcd file which is 8-10% less in size from original
vcd, without disturbing any siganl changes (events)? Can it be useful
?

Thanks and Reagards,
Thiru.

I think that commencrial programs like Signalscan can compress it by an
order of magnitude
and this is neccessary for large applications.

--
Best Regards,
Ulf Samuelsson ulf@a-t-m-e-l.com
This is a personal view which may or may not be
share by my Employer Atmel Nordic AB

 

[Nahum Barnea]

thirunadh@yahoo.co.in (thirunadha rao) wrote in message news:<ff5b6e8.0405240307.269b5df5@posting.google.com>...

Hi,

Can someone please answer to my following question on vcd (value
change dump) file.

If i have a program to reduce a given vcd file size by 8-10%, can it
be useful ? Basically, my program takes a vcd file as an input and
produces another vcd file which is 8-10% less in size from original
vcd, without disturbing any siganl changes (events)? Can it be useful
?

Thanks and Reagards,
Thiru.

As you probebly know, vcd waste alot of bytes because it is a ascii
file.
I think that just by transferring it to binary file (use non printable
bytes) one can save more than 10 %.