步进电机.txt

关于EDA编程的一些程序

module w1(clk,dout,ip,key);//步进电机
input clk,key;
output[3:0] dout,ip;

reg[1:0] st;
reg[3:0] dout,ip;

always @(negedge clk)
begin
  st=st+1;
  ip=ip+1;
end

always @(posedge clk)
begin
  if(key)
  case(st)
  0:dout=4'h8;
  1:dout=4'h4;
  2:dout=4'h2;
  3:dout=4'h1;
  endcase
  else
  case(st)
  0:dout=4'h1;
  1:dout=4'h2;
  2:dout=4'h4;
  3:dout=4'h8;
  endcase
end

endmodule