Hi Waqar,

With a 20 MHz scope, you won't see any sqare waves. It doens't have enough bandpass so it filters out the "edges" of the pulses. If you can get your hands on a 100+ MHz scope to compare, you'll see the difference.

If you start working at higher clock frequencies, the edges and glitches you're looking for simply won't be there on a 20 MHz scope.

Dennis