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SampleFinal

# SampleFinal - EE 101 Sample Final Redekopp Name 1 Answer...

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EE 101 Sample Final Redekopp Name: ________________________________________ Taken from Fall ’02 / ‘03 1.) Answer the following questions as True or False a.) A 4-to-1 multiplexer requires at least 4 select lines : true / false b.) An 8-to-1 mux and no other logi can be used to implement any combinational logic function of 4 input variables : true / false c.) A 3-to-8 decoder along with (4) 8-input OR gates can be used to implement any combinational logic involving 3 input variables and 4 output variables : true / false d.) 3 separate 2-to-1 muxes can be used to build a single 4-to-1 mux : true / false e.) A 4-to-16 decoder with an enable can be used as a 1-to-16 demultiplexer : true / false f.) 5 flip-flops are required to implement a state machine with 5 states : true / false g.) In a state machine with Moore style outputs, a change in the external inputs can independently and immediately cause the outputs to change : true / false h.) In binary, performing X-Y can be performed by a dding X to the 2’s complement of Y : true / false i.) The characteristic equation of a JK Flip- flop is Q* = J•Q + K ’• Q : true / false j.) The passive inputs (hold state) of an active-hi set and reset SR-Latch are S=0, R=0: true / false

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2.) State Machine Design (Down Counter w/ Restart) : Design a synchronous state machine circuit that implements a 2- bit down counter (i.e. counts 11, 10, 01, 00, 11…). The circuit has an external input, R (RESTART), that when ‘1’ should force the counter back t o the 11 state no matter what the current state is. As long as R stays ‘1’, the counter should stay in the 11 state. The circuit should also have one output Z. Z=1 when in the 00 state and Z = 0 otherwise.
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SampleFinal - EE 101 Sample Final Redekopp Name 1 Answer...

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