shifter_2.v

来自「VerilogHDL_advanced_digital_design_code_」· Verilog 代码 · 共 27 行

module shifter_2 (sig_d, new_signal, Data_in, clock, reset);
  output 		sig_d, new_signal;
  input 		Data_in, clock, reset;
  
  reg 		sig_a, sig_b, sig_c, sig_d, new_signal;

  always @  (posedge reset or posedge clock)
    begin
      if (reset == 1'b1)
        begin
          sig_a <= 0;
          sig_b <= 0;
          sig_c <= 0;
          sig_d <= 0;
        end
      else  
        begin
          sig_a <= shift_input;
          sig_b <= sig_a;
          sig_c <= sig_b;
          sig_d <= sig_c;
        end
    end
    assign new_signal = (~ sig_a) & sig_b;
 endmodule