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JTAG Expected TDO Data

I've been learning to use the LabVIEW JTAG library from here:

 

http://www.ni.com/example/31157/en/

 

I can successfully get the ID code from my device, but I am puzzled by the expected TDO data in the Load - Unload Registers.vi. Here is an example:

 

VI.png

 

I have ot create TDO and TDI data, and pass them both into the load-unload VI.

 

Is the TDO data just there so the VI knows how many clocks to generate?

 

If the answer to the above question is yes, then why can't I just tell it how much data to expect rather than actually having to create a dummy data array?

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Hi Jo-Jo,

 

Thanks for posting in the forums! Here is a link to a forum post that is specific to JTAG: http://forums.ni.com/t5/Components/JTAG-Digital-Waveform-Library/td-p/855097

 

I think you will have better luck finding an answer to your question if you post it there. 

Tina K.
Applications Engineering
National Instruments
ni.com/support
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