分布式乘法器

module  distributed
#(parameter width=3,parameter width2 = 8)/*调试错误一*/

(
    input clk,
    input [width - 1 : 0] in_data,
    output [width2-1 : 0] out_data,
    output[3 : 0] rom_data,
    output flag
    );

//reg flag;/*用上面的方式定义的端口是不能这样来定义的*/

reg [width2-1:0] out_data_r1,out_data_r2;
reg[3:0] rom_out;
reg flag_r;

integer counter ;/*调试错误二，integer 不能改为reg*/

lpm_rom rom1/*ROM块的调用*/
(.address(in_data), .inclock(clk), .outclock(clk), .q(rom_out));
defparam rom1.lpm_width = (width + 1);
defparam rom1.lpm_widthad = width;
defparam rom1.lpm_file = "distributed_rom.mif";
always@(posedge clk)
begin
 counter <= counter + 1;
 if(counter < 2)
 begin
 
  out_data_r1 <= 8'd0;
  flag_r <= 0;
 end
 else if(counter >5)
  begin
   counter <= 0;
   out_data_r1 <= 0;
   out_data_r2 <=out_data_r1;
   flag_r <= 0;
  end
 else
 begin
 out_data_r1 <= out_data_r1 + ( {4'd0,rom_out} <<( counter-2));
 flag_r <= 1;
 end
end
assign out_data = out_data_r2;
assign rom_data = rom_out;
assign flag = flag_r;
endmodule