自动并行转串行数据流

根据ISE的language templates里我找到了并行转串行的代码：

   parameter piso_shift = <shift_width>;
   
   reg [piso_shift-2:0] <reg_name>;
   reg                  <output>;

   always @(posedge <clock>)
      if (<load_signal>) begin
         <reg_name> <= <input>[piso_shift-1:1];
         <output>    <= <input>[0];
      end
      else begin
         <reg_name> <= {1'b0 <reg_name>[piso_shift-2:1]};
         <output>   <= <reg_name>[0];
      end