[755-1] Reset on dynamic-CMOS DFF

[Konstantinos Dovrolis <dovrolis@cs.wisc.edu>]

Folks,

A couple of people asked how can they include an asynchronous 
Reset in the dynamic CMOS flip-flops that are shown in the book
(figures 5.58, 5.59 and elsewhere). This is actually the tricky 
part of the homework that you are supposed to figure out 
yourself :) 

Keep in mind though that whenever Reset goes low, you have to 
immediately force the output to zero independently of the clock
(which means something about the second stage of transistors in 
the circuit of 5.58e, for example), and also that you have to set 
the state of the first stage of transistors in that circuit to one. 
If you don't do this latter part, the Reset will not really work
as expected.

I hope that this helps.

C.