[Ether]

Originally Posted by Thad House

EDIT: Nevermind. I didn't see the 25ns number above. Does that mean that that the RoboRIO can take 40,000,000 edge to edge pulses per second

It means the roboRIO samples the edges at 40MHz, and timestamps them with a 40MHz clock (25ns resolution) when detected.

So no, you wouldn't get a usable reading at 40M edges per second.

Note: back in 2012, the cRIO FPGA took samples at only 153KHz, and timestamped them with a 1MHz clock. That's why we had all the discussions back then.