PPT Slide
The problem
- correct behavior assumes next state of all storage elements determined by all storage elements at the same time
- this is difficult in high-performance systems because time for clock to arrive at flip-flop is comparable to delays through logic
- effect of skew on cascaded flip-flops:
original state: IN = 0, Q0 = 1, Q1 = 1
due to skew, next state becomes: Q0 = 0, Q1 = 0, and not Q0 = 0, Q1 = 1