[HDLBits] Sim/circuit10

This is a sequential circuit. The circuit consists of combinational logic and one bit of memory (i.e., one flip-flop). The output of the flip-flop has been made observable through the output state.

Read the simulation waveforms to determine what the circuit does, then implement it.

2030405060708090100110120130140150

module top_module (
    input clk,
    input a,
    input b,
    output q,
    output state  );
    
    always @(posedge clk)
        begin
            if (a == b) 
            	state <= a;
            else 
            	state <= state;
        end
        
    assign q = (a == b) ? state : ~state;
    
endmodule