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How can I generate a VCD file?

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Mamdouh

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VCD file

How can I generate a VCD file?
 

Re: VCD file

Mamdouh said:
How can I generate a VCD file?
Click to expand...

Hi,
Inorder to generate a vcd file , you have to use following key words in your test bench file ... ie <testbench top filename.v>:
type :


initial
dumpfile("module_name.vcd");
initial
dumpvars();

If you simulate with this logic you will surely get the vcd file.
 
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    njr@1

    Points: 2
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open terminal and load ur verilog file (cd /cad ...cd <filename>)
then type
"vcs <pathname> <pathname of testbench> + v2k -debug_all
`/simv-gui"
waveform is generated
right click on the schematic,add to wave simulator_start

then .vcd file is generated
 
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    njr@1

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$dumpvars;

Paste this in ur test bench
 

nsingh95 said:
Hi,
Inorder to generate a vcd file , you have to use following key words in your test bench file ... ie <testbench top filename.v>:
type :


initial
dumpfile("module_name.vcd");
initial
dumpvars();

If you simulate with this logic you will surely get the vcd file.
Click to expand...

how can i write these lines in vhdl format

Added after 1 hours 4 minutes:

to be specific i want to generate vcd file from testbench.vhd using xilinx ?
 

Mamdouh said:
nsingh95 said:
Hi,
Inorder to generate a vcd file , you have to use following key words in your test bench file ... ie <testbench top filename.v>:
type :


initial
dumpfile("module_name.vcd");
initial
dumpvars();

If you simulate with this logic you will surely get the vcd file.
Click to expand...

how can i write these lines in vhdl format

Added after 1 hours 4 minutes:

to be specific i want to generate vcd file from testbench.vhd using xilinx ?
Click to expand...

Hi,
Please see the section 11 of the attached pdf. All your issues will be resolved.
 

first thanks very much i used the commands in the manual and here's the generated vcd file i know there's something wrong but i cant figure it out??


$comment
File created using the following command:
vcd file ana.vcd -dumpports

$end
$date
Thu May 06 22:35:44 2010
$end
$version
dumpports ModelSim Version 6.5
$end
$timescale
1ps
$end
$vcdclose
#1000
$end
Click to expand...
 

Mamdouh said:
first thanks very much i used the commands in the manual and here's the generated vcd file i know there's something wrong but i cant figure it out??


$comment
File created using the following command:
vcd file ana.vcd -dumpports

$end
$date
Thu May 06 22:35:44 2010
$end
$version
dumpports ModelSim Version 6.5
$end
$timescale
1ps
$end
$vcdclose
#1000
$end
Click to expand...
Click to expand...

Hi,
Please let me know the issue you are facing.
 

Mamdouh said:
first thanks very much i used the commands in the manual and here's the generated vcd file i know there's something wrong but i cant figure it out??


$comment
File created using the following command:
vcd file ana.vcd -dumpports

$end
$date
Thu May 06 22:35:44 2010
$end
$version
dumpports ModelSim Version 6.5
$end
$timescale
1ps
$end
$vcdclose
#1000
$end
Click to expand...
Click to expand...

It looks like there was no activity on your signals hence the VCD file is empty of "value changes". Did you see a waveform in Modelsim? If so do you have a vsim.wlf file created? If yes you may also use

Code: 
wlf2vcd (or something similar)

to create VCD out of WLF file.

Regards
TeamCVC
www.cvcblr.com/blog
 

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