// Unsigned 16x24-bit Multiplier
// 1 latency stage on operands
// 3 latency stage after the multiplication
// File: multipliers2.v
//
module mult_unsigned (clk, A, B, RES);
//Default parameters were changed because of slow test
//parameter WIDTHA = 16;
//parameter WIDTHB = 24;
parameter WIDTHA = 8;
parameter WIDTHB = 12;
input clk;
input [WIDTHA-1:0] A;
input [WIDTHB-1:0] B;
output [WIDTHA+WIDTHB-1:0] RES;

reg [WIDTHA-1:0] rA;
reg [WIDTHB-1:0] rB;
reg [WIDTHA+WIDTHB-1:0] M [3:0];

integer i;
always @(posedge clk)
 begin
  rA <= A;
  rB <= B;
  M[0] <= rA * rB;
  for (i = 0; i < 3; i = i+1)
    M[i+1] <= M[i];
 end

assign RES = M[3];

endmodule