FPGA specific timing requirement

I basically have a max period of 2us. In this period I need to pulse one signal and then turn it off and pulse another signal and turn it off. The next period of this firing will then change by a measurement with a resolution of 2ns. These signals are like a clock you could say as they enable the device they're pulsing to turn on and off.

Bascially, I need to have very precise control over the frequency i'm pulsing because I only have a very small bandwith that i'm working with and the slope is very steep over this bandwith so that a few hundred Hz difference can produce a big difference in my output. With 2ns resolution i'm looking at only a resolution of 320 Hz.

EDIT: For clarity