This is called the Mealy ModelĪnother kind of circuit: Output only depends on present state. Preceding Example: Output depends on present state and input. Propagation delay: tp Some delay from trigger to output changeĮxample: Negative edge triggered flip-flip Hold time: th Input needs to be stable after trigger Set-up time: ts Input needs to be stable before trigger Positive-edge triggered Negative-edge triggered Only the value of D at the positive edge matters. On the positive edge (while the clock is going from 0 to 1), the input D is read, and almost immediately propagated to the output Q. What happens during the entire HIGH part of clock can affect eventual output.Įdge-triggered: Read input only on edge of clock cycle (positive or negative) Example below: Positive Edge-Triggered D Flip-Flop Pulse-triggered: Read input while clock is 1, change output when the clock goes to 0. Edge-triggered Flip-Flop, State Table, State DiagramĮdge-triggered Flip-Flop Contrast to Pulse-triggered SR Flip-Flop
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |