counter.v

8位RISC CPU,包括alu,count,machine等等

module counter(pc_addr,ir_addr,load,clock,rst);
output[12:0]pc_addr;
input [12:0]ir_addr;
input load,clock,rst;
reg[12:0]pc_addr;
always@(posedge clock or posedge rst)
begin
  if(rst)
   pc_addr<=13'b0000000000000;
  else
   if(load)
     pc_addr<=ir_addr;
   else
     pc_addr<=pc_addr+1;
end
endmodule