I have been working with the AD9910 evaluation board for some time now using the evaluation software to generate a continuously repeating frequency ramp. I use the Internal IO Update and Auto Clear Digital Ramp Accum. to reset the sweep every 2 ms. I now want to be able to trigger the sweep manually and externally.
From reading the manual, I should be able to do this if I:
1) Enable the Auto Clear Digital Ramp Accumulator bit
2) Set DRCTL to high
3) Trigger I/O Update every time I want to generate a sweep
These 3 events do not seem to trigger a sweep so I was wondering if there were other steps I am missing. Or if there has been another thread that addresses this issue.