With the help of 2 generators of signals on a FIFO shared

I have the device of the series M (NI USB-6259) and would create 2 tasks, DO1 and DO2, using subsets of lines on Port 0. The two waveforms will be sinosoidales, that I will store on FIFO of the device. Both tasks will have different examples of two lines PFI clock (clock is 1000 times faster than the other). In addition, the sizes of waveform for two tasks will be different also.
Once the tasks are started, I want to send the waveform to MAKE FIFO data and the RegenMode set to True in order to eliminate ongoing entries of the computer to the USB/PCI bus FIFO buffer.
My question is - is the device M-series allow reading of FIFO to DO separately two DO tasks to different sample clocks?
If the answer is NO, can I disable FIFO for one or two tasks by setting UseOnlyOnBrdMem to True? Are there any device not M-series allow 2 tasks FIFOed DO?
If the answer is YES, are there settings/options on which must be paid to work? I would have preferred an example of use of Measurement Studio (DAQmx C API).

Victor

Hi vicpik,

I don't know what you mean by sinosoidales referring to digital output lines, do you mean you want to produce trains of pulses with a cycle of 50%?

The 6259 allows correlated digital i/o on port 0, which means that it is hardware timed but the clock must be from another source.  However, there is only a single circuit of calendar for digital output so that you cannot route signals from multiple locations on different lines.  Thus, two output lines digital correlated cannot have separate examples of clock.

There is probably a way you can reach your goal with the 6259, but again, I'm not clear on what you mean by sinusoids.  The standard way to write several digital lines at different rates on the same timing system would be to use the lowest common denominator for your clock frequency and generate several samples that needed to create any arbitrary digital signal.  I hope that this makes sense, but please let me know if not.

The other option, if you need to generate a simple square wave or pulse train would be to use the meter exits the 6259.  Additional information would be useful to determine the best course of action.  Thanks for posting!

-John

Tags: NI Hardware

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