generating signal from a .VCD file using NI-6541 HDSIO module

[HuguesThales]

Good afternoon,

My goal is to generate signal from a .VCD file (which originate from a VHDL modelsim simulation) with my HDSIO NI-6541 module.

Here is what I have done:

1) I used the Digital Waveform Editor to generate a HWS file from the VCD file. I followed the steps from this link : http://zone.ni.com/reference/en-XX/help/370748C-01/dwe/vcd_import_help/

I wasn't able to sample "On Edges of VCD Signal" because no signal would appear in the popuplist as shown on the following screenshot:

I therefore sampled on a "Fixed Timebase or Rate" as shown on the following screenshot :

2) Once my .HWS file was created. I opened up signal express and tried to generate a signal from the .HWS file. Everything seemed to work out until I tried to excecute the program and the following error message poped up : "requested waveform length is invalid, because the number of samples is not an integer of the waveform length increment."

I really don't understand why this error pops up... I've tried generating multiple .vcd files, and using several modules in Signal express but I can't seem to have it work 😞

I'm sure my HDSIO module works though. I've been able to test it with NI MAX.

Would anyone have any experience with HDSIO modules and would know what I am doing wrong ?

Thanks a lot in advance for your help!!

[Cdkey]

Good afternoon HuguesThales,

Are you sure that there is nothing wrong in your VCD files?

Because maybe Signal Express can't import your signals from the file because of that.

Have a nice day.

[HuguesThales]

Good afternoon CdCdkey,

NI digital waveform editor generates a .HWS from my .VCD file so I'm guessing there is nothing wrong with it.

I don't know how else I could "test" my .VCD file... I attached test_hugues.vcd to this message in case you would have any way of checking if there is something wrong with it.

I will be contacting NI soon and will try to keep this post updated.

Thank you and have a nice day.

[HuguesThales · Accepted solution]

Hey,

I was able to get rid of the error by changing the length of my signal on Digital Waveform Editor. (I read somewhere that the length of the signal should be a multiple of 4).

I then had another error telling me my Waveform Length exceeded the total device memory. Again, I was able to remove samples using Digital Waveform Editor.

It now works.