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University of Florida
EEL 3701-Spring 2019
Dr. Eric. M. Schwartz
Department of Electrical & Computer Engineering
Wednesday, 27 February 2019
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[17%] 8. Design a system that "counts" as shown.
The system must
asynchronously go to state "2" when Restart (active-high) goes true. W
is an active-low signal that determines the next "count" after "0," as
shown in the figure. Use a T-FF for the most significant bit of your design,
W = L.
a JK-FF for the least significant bit, and D-FF(s) for any other bits you
might need. An active-low output, Y should be true when the "count" is
"5." All other outputs should be active-high. Note: All the given FFs have
asynchronous clear and set inputs as shown.
a) Draw a functional block diagram (showing all the inputs, all the outputs,
and the functional blocks). Put your design in the dashed box with the inputs
and outputs going into or out of the box, on the left or right, respectively.
This is not a circuit diagram.
y ( L )
W ( 4) -
X2 ( H )
XI (H )
Xo (A )
b) Complete the next-state truth table (in counting order).
X - XOX X-
- X X X - x
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