pc.v

本代码是在modelsim下运行的模拟8×8位的CPU

module PC(pc_out,pc_in,clk,reset,load_enable,count_enable);
   parameter    width=8;

   output[width-1:0] pc_out;  //PC??????
   input [width-1:0] pc_in;   //PC??????
   input clk;                 //????????????
   input reset;               //????????????
   input load_enable;         //????
   input count_enable;        //????
   reg   [width-1:0] pc_out;

   always @(posedge clk or negedge reset)
       begin
	    if(!reset)
		pc_out <= 'b0;
	    else
		if(load_enable)
	          pc_out <= pc_in;       //?????
		else
	          if(count_enable)
		      pc_out <= pc_out+1;//??
/*		   else
		      pc_out <= pc_out;  //??
*/
       end
endmodule