2 continuous digital waveforms using pxi 6544

[Mystogan]

hi tobias,

somehow in my main program, I keep getting "TRUE" as output of "done". Which means my clock would be instantly gone.

I can avoid that by deleting export sample clock.vi from the main program. Its weird.

regards,

yan.

[trummel]

Hello Yan,

have you found a solution? Or does the problem already exist?

Best regards,

Tobias

[Mystogan]

hi tobias,

Like I said yesterday, I can avoid the error by deleting the export clock signal.vi. But now I dont know how to output my clock without that block. It is possible to get sample clock from my DIO pin? From the datasheet, sample clock might only be exported to CLK OUT or DDC CLK OUT pin.

regards,

Yan. 

[Mystogan]

hi,

I mean I want to export my sample clock into DIO pin, is it possible? I've read somewhere its not possible. Is it true? can I generate serial data continuously with full speed (sample clock) using DIO pin?

regards,

yan.

[trummel]

Hello Yan,

which hardware components do you use? So I can rebuild your System and try it.

About your question, actually I didn't find anything. But if I find something I will let you know.

Best regards,

Tobias

[Mystogan]

hi Tobias,

I'm using PXIe 6544 HSDIO card, and my chassis is PXIe 1082.

regards,

Yan.

[trummel]

Hello Yan,

Iam very sorry about writting so late to you. I wasn´t in office on friday.

Can you describe your request in more details? Because we don´t have the right hardware in the office at the moment so I cant rebuild the system.

Best regards,

Tobias

[Mystogan]

hi Tobias,

I was asking if its possible to export the generated sample clock using PXIe 6544 to DIO pin instead of DDC CLK OUT or CLK OUT pin?

Its like: generating 40MHz clock, and having a 40MHz waveform in 1 DIO pin. I've read the manuals, I think my device generation is SDR, which means its not possible to have output signal with same rate with the sample rate.

regards,

Yan.

[trummel · Accepted solution]

Hello Yan,

on page 9 of NI PXIe-6544/6545/6547/6548 Specifications u can read that it is only possible to export the Clock on CLK OUT or DDC CLOCK OUT. And yes your device generatrion is Single Data Rate.

Link:

http://www.ni.com/pdf/manuals/374962d.pdf

But if you want to export your sample clock to DIO,

- you have to choose the clock 2 times faster,

- and the ouput of your normal data have to be Double Data Rate (DDR)

- and creat a DO as clock by the DO alternate HIGH-LOW output

Can you please try this VI? This one is a new modification of your VI. I Can´t try it in office because I actually don´t have the hardware here.

I hope we can avoid with this the error which appears if you don´t delete the export sample clock.vi

Best regards,

Tobias

[trummel]

Hello Yan,

Iam sorry. I forgot the VI.