I'm am using the DRG in AD9910 to generate a continuous bi-directional frequency ramp by setting both no-dwell bits to high. I am also monitoring the DROVR pin to detect when the upper or lower frequency limits are reached.
However, I also need some digital signal that can tell me the direction of the frequency ramp (up or down) in run-time. I thought about monitoring the DRCTRL pin (which controls the direction of the ramp) but I did not detect any signal on that pin (probably because it is an 'input-only' pin).
Please tell me if there is some way to know the direction of the ramp in run-time.