PCI-4451 Analog Output using FIFO allocation mode

Question

I'm using a PCI-4451 DSA device to generate a short length (<50 updates) repeating pulse train. I want to write directly to the 4451's onboard FIFO so that I only have to transfer data to the device once and let the 4451 continuously regenerate the pulse train on its own. Using the the AOCONFIG.vi I set the allocation mode to "6" (use FIFO Memory). But when I write to the buffer, and then call AOSTART.vi, I get no output. Sometimes my system simply crashes. In either case, I get no LabVIEW generated errors when I set the allocation mode to "use FIFO memory." According to my 4451 documentation, I do have an AO FIFO, so it should be working. What could be going wrong?

Answer 1

Thanks for your response,
I used the VI you linked to and the non-FIFO mode AO works fine. In FIFO mode, it does end up generating an output, but it only iterates through the buffer once, no matter what the input to "number of buffer iterations" is on AOSTART.vi. I want it to regenerate indefinitely, but wiring "0" to "number of buffer iterations" and allowing regeneration on AOWRITE.vi doesn't make it do that. Could this be caused by a driver problem?
Also, I figured out that if I run a non-FIFO mode AO, stop the VI (I allow AOCLEAR.vi to execute), and then switch to a FIFO mode AO without first shutting down LabVIEW, my system locks up. It's not enough to just close the VI and reopen it to get FIFO mode to run again without locking up; I
actually have to exit and restart LabVIEW. Running a FIFO mode AO first and then runnning a non-FIFO mode AO causes no problems. I'm using Win2k professional and LabVIEW 7.