digital waveform generate and receive with data delay

[billow.j]

when i use labview hsdio example :Dynamic Generation and Acquisition-Source Synchronous.vi, i find that

the received data and output data wiht 1/4 period delay.how to reduce the delay time.i use tek dso3012B

to see the strobe signal and data signal output at the same time.thanks a lot!

my hardware is PXI-6542.the soft platform is labview 8.6.

帖子被billow.j在 07-12-2009 09:09 PM

时编辑过了

[Keith.Shapiro]

I'm sorry.. I'm not sure I understand.  Do you mean that the data follows the clock by 1/4 period?  The 6542 defaults to 2.5ns of Tco (time from clock to data out).  Are you trying to line up the rising edge of your clock with start of a sample?

Thanks,

Keith Shapiro

National Instruments R&D

[billow.j]

thanks!

i mean that when i rise signa frequence,the delay time seems to correlate with it.

it isn't a constant time delay.i also use the same device port(first 16 line using to send data,other 16 line using to get data) to receive data.

帖子被billow.j在 07-15-2009 09:09 PM

时编辑过了

[Keith.Shapiro]

I'm still not sure I understand.  Can you please provide a drawing of your system and where you're measuring with the scope?

Thank you,

Keith Shapiro

National Instruments R&D