Registers
- SR FF (Set Reset Flip Flop)
- D FF (Data Flip Flop)
- Jk FF (Jump kill Flip Flop)
- TFF (Toggle Flip Flop)
SR FF (Set Reset Flip Flop)
-
characteristic Table
S R Q(t+1) 0 0 Q(t) 0 1 0 1 0 1 1 1 unvalid
how it works?
its obvious! S=1 and R=0 mean that we set 1 on the output. S=0 and R=1 mean that we reset the output. S=R=0 means that output will not change.
note
if we set S=R=1, then both of Q and Q' would be 0, which is unvalid.(these two outputs should be complement of each other.)
D FF (Data Flip Flop)
-
characteristic Table
D Q(t+1) 0 0 1 1
how it works?
this flip flop put input on output directly.
Jk FF (Jump kill Flip Flop)
-
characteristic Table
j k Q(t+1) 0 0 Q(t) 0 1 0 1 0 1 1 1 Q '(t)
how it works?
its really simple. j=1 and k=0 mean that output will jump on 1. j=0 and k=1 mean that output quantity will be killed. j=k=0 means that output will not change. j=k=1 means that output will be toggled.
TFF (Toggle Flip Flop)
-
characteristic Table
T Q(t+1) 0 Q(t) 1 Q '(t)
how it works?
if input is T=0, output will not change. if input is T=1, output will be toggle( zero to one and vice versa).