bit repetition on 6534pxi card for high frequency

[Hari Seldon]

Hi,

I have a problem with my  pxi6534 card setup in input because that card repeats the first bit of my data read for clock frequencies higher than 1MHz.

In fact, I notice this phenomenon when I visualize it only under oscilloscope since the data read array does not note this unfortunate repetition. At the beginning I thought that came from a for or while loop… but I looked with attention and taken some precautions especially with iteration terminals of  loops where those could generate this repetition.

The problem would however come from the digital  6534 cards but they can function until 20MHz (according to the application mode) what leaves me a certain margin. if somebody has an idea or already observed it…

thanks  for your answers

Hari

[Matthieu Papaux]

Hi Hari,
Do you try to set the Regeneration property of the card to "do not allow regeneration"?

It could be a good solution to set his property.

Have a great Day.

Matthieu Papaux
National Instruments

PS If the probelm persist you can post an example which explain this problem.