// mult_20x20_carsav_noreg.v
//
// 20 x 20-bit signed multiplier
//    with two product outputs that are meant to simulate carry-save format.
//    They are a valid carry-save format but are not exactly what would 
//    normally appear with a real hardware multiplier.
//    Inputs and outputs are *not* registered.
//
// 2007/02/10  Removed registers from inputs and outputs so they should
//             be included in other block (to simplify external timing 
//             in synthesis).
// 2006/02/18  Written

`timescale 10ps/1ps
`celldefine
module mult_20x20_carsav_noreg (
   ina,
   inb,
   out_0,
   out_1
   );

   input         [19:0]         ina;
   input         [19:0]         inb;

   output        [39:0]         out_0;
   output        [39:0]         out_1;


   //----- declarations
   wire        [39:0]           out_0;
   wire        [39:0]           out_1;
   

   //----- main
   // ina = ina[18:0] - (ina[19] << 19);
   // inb = inb[18:0] - (inb[19] << 19);

   assign out_0 =   inb[18:0]      * (ina[18:0] - (ina[19] << 19));
   assign out_1 = -(inb[19] << 19) * (ina[18:0] - (ina[19] << 19));


endmodule  // mult_20x20_carsav_noreg
`endcelldefine