Fsm3s

See also: State transition logic for this FSM

The following is the state transition table for a Moore state machine with one input, one output, and four states. Implement this state machine. Include a synchronous reset that resets the FSM to state A. (This is the same problem as Fsm3 but with a synchronous reset.)

 

module top_module(
    input clk,
    input in,
    input reset,
    output out); //
	
    parameter A =2'b00,
    B = 2'b01,
    C = 2'b11,
    D = 2'b10;
    
    reg [1:0] state;
    reg [1:0] next_state;
    
    // State transition logic
    always@ (posedge clk)
        if(reset)
            next_state <= A;
    else case (next_state)
        A : if(in == 1)
            	next_state <= B;
        	else 
                next_state <= A;
        B : if(in == 0)
            	next_state <= C;
        	else 
                next_state <= B;
        C : if(in == 1)
            	next_state <= D;
        	else 
                next_state <= A;
        D : if(in == 1)
            	next_state <= B;
        	else 
                next_state <= C;
        default:next_state <= A;
    endcase
    
    // State flip-flops with synchronous reset
	always@(*) begin
        state <= next_state;
    end
    // Output logic
	assign out = state == D ? 1'b1 : 1'b0;
endmodule