Lab 4: Flip-flop Flavors

Background

In the lectures, we have discussed the different types of flip-flops, as shown in the figure.

Comparison of D, T, SR, and JK Flip-Flops with Example States

Connecting with other classes, flip-flops are more generally considered bistable multivibrators! They have two stable states and can switch between them based on input signals. The only two conditions to become a fully functioning flip-flop useful to implement any synchronous circuit is to be triggerable relative to a clock signal, and to be able to switch states between 1 and 0 (flip-flopping).

The characteristic tables of each flavor is as follows:

D	Q(t+1)
0	0
1	1

J	K	Q(t+1)
0	0	Q(t)
0	1	0
1	0	1
1	1	Q'(t)

T	Q(t+1)
0	Q(t)
1	Q'(t)

S	R	Q(t+1)
0	0	Q(t)
0	1	0
1	0	1
1	1	Undefined/Invalid

Instructions

Due to the fact that flip-flops only need to be able to switch between 1 and 0 to be able to implement any logic, it is possible to create any flip-flop flavor from any other flip-flop flavor. For this assignment, you are asked to implement D flip-flops using the three other flavors of flip-flops.

1. Download the Lab 4 template in UVLe.
2. Inside the dffButJK block, implement a D flip-flop with a JK flip-flop adding only logic gates.
3. Inside the dffButT block, implement a D flip-flop with a T flip-flop adding only logic gates.
4. Inside the dffButSR block, implement a D flip-flop with a SR flip-flop adding only logic gates.

dffButJK block template

Notes

• Again, do not move any input or output pins in the template.