Hi Dennis,
I think I dint convey my question properly. The trigger which I'm taking about is not the trigger input to the basic event counter. The ultrasonic sensor needs a 10us pulse for it to send a high at its echo pin. I just want the PFI0 pin to produce(send) a 10us pulse. For this, I need to know the usb 6008's clock frequency. (To know whether PFI0 can produce a 10us or not, as PFI0 acts as a counter). I could'nt find the clock frequency on the specs.