3-M2 - Midterm 2 ECE 25, Fall 2008 Thursday, November 20,...

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Consider the following incompletely-specified Mealy machine (“*” indicates don’t cares). 0/1 A B C 1/* 1/1 0/0 1/* 0/0 Supposeweusethefo l low ingstateencod ing .(Assumethenametheinputvar iab leis I .) State S 2 S 1 S 0 A 100 B 010 C 001 Derive the minimum two-level logic for each of the following (you should minimize each logic function separately, no need to worry about sharing logic between logic functions). F = S 2 + = S 1 + = S 0 + = 1
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Consider the following diagram. Q 3 + Q 2 + Q 1 + Q 0 + 0 1 MUX D-FF 0 1 MUX D-FF 0 1 MUX D-FF 0 1 MUX D-FF D-FF D-FF D-FF D-FF 1 0 1 MUX 0 1 MUX 0 1 MUX 0 1 MUX 0 X 3 X 2 X 1 X 0 Q 3 Q 2 Q 1 Q 0 P 3 P 2 P 1 P 0 P 3 + P 2 + P 1 + P 0 + S S S S S S S S Given the values for control input S , the data inputs X 3 X 2 X 1 X 0 ,andthefl ip-flopva lues P 3 P 2 P 1 P 0 and Q 3 Q 2 Q 1 Q 0 , what will be the new flip flop values P + 3 P + 2 P + 1 P + 0 and Q + 3 Q + 2 Q + 1 Q + 0 ? Note: All MUXes are controlled by the same control input S ,and 0 and 1 mean a constant logic value of “false” (“0”) and “true” (“1”), respectively.
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3-M2 - Midterm 2 ECE 25, Fall 2008 Thursday, November 20,...

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