The following is the state transition table for a Moore state machine with one input, one output, and four states. Use the following one-hot state encoding: A=4'b0001, B=4'b0010, C=4'b0100, D=4'b1000.
Derive state transition and output logic equations by inspection assuming a one-hot encoding. Implement only the state transition logic and output logic (the combinational logic portion) for this state machine. (The testbench will test with non-one hot inputs to make sure you're not trying to do something more complicated).
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module top_module(
input in,
input [3:0] state,
output [3:0] next_state,
output out); //
parameter A=0, B=1, C=2, D=3;
// State transition logic: Derive an equation for each state flip-flop.
assign next_state[A] = ((state[A])&&(!in))||((state[C])&&(!in));
assign next_state[B] = ((state[A])&&(in))||((state[B])&&(in))||((state[D])&&(in));
assign next_state[C] = ((state[B])&&(!in))||((state[D])&&(!in));
assign next_state[D] = ((state[C])&&(in));
// Output logic:
assign out = (state[D])?1:0;
endmodule
這個題目中表示state是否是我們需要的狀態的寫法可以學學next_state[A]