Multi-type multiplier working

-only reference model implemented
-Next, implement complete algorithm and output partial products

common/hdl/oh_multiplier.v

@@ -9,19 +9,24 @@ module oh_multiplier #(parameter DW  = 16  //multiplier width
 		       ) 
 (
  input [DW-1:0]        a, // a input
+ input 		       a_signed,//a operand is signed
  input [DW-1:0]        b, // b input
- input 		       cfg_signed,//1=signed operands, 0=unsigned
+ input 		       b_signed,//b oeprand is signed
  output [(2*DW+2)-1:0] pp1,// partial product output (carry save format)
  output [(2*DW+2)-1:0] pp2, // partial product output (carry save format)
- output [DW-1:0]       product // output
+ output [2*DW-1:0]     product // output
  );
+   
+   wire signed [2*DW+1:0] product_signed;
 
-   wire signed [DW-1:0] product_signed;
+   assign a_sext = a_signed & a[DW-1];
-   wire signed [DW-1:0] product_unsigned;
+   assign b_sext = b_signed & b[DW-1];
+    
    
-   assign product[DW-1:0] = cfg_signed ? $unsigned(product_signed) :
+   assign product_signed[2*DW+1:0] = $signed({a_sext,a[DW-1:0]}) *
-			                 product_unsigned;
+				     $signed({b_sext,b[DW-1:0]});
+
+   assign product = product_signed[2*DW-1:0];
    
- 
 endmodule // oh_multiplier