Always try this debugging before posting here.
Neways could u suggest any way of testing the d flip flop circuit without a proper oscilloscope..?
Moreover could u tell me what exactly a xtal does i.e. how does it give the uC a sense of timing?
Why does the ADC have only one clock pin instead of an xtal1 and xtal2 like on a uC?
Can we give a simple PWM of the same frequency(640mhz 50% duty cycle) to the clock pin of the ADC?
My basic electronics is pretty weak as u can seee