Subversion Repositories viterb_encoder_and_decoder

module ACS

(

   path_0_valid,

   path_1_valid,

   path_0_bmc,

   path_1_bmc,

   path_0_pmc,

   path_1_pmc,

   selection,

   valid_o,

   path_cost

);

   input       path_0_valid;

   input [1:0] path_0_bmc;

   input [7:0] path_0_pmc;

   input       path_1_valid;

   input [1:0] path_1_bmc;

   input [7:0] path_1_pmc;

   output reg        selection;

   output reg        valid_o;

   output      [7:0] path_cost;

   wire  [7:0] path_cost_0;

   wire  [7:0] path_cost_1;

   assign path_cost_0  =  path_0_bmc + path_0_pmc;

   assign path_cost_1  =  path_1_bmc + path_1_pmc;

   assign path_cost      =  (valid_o?(selection?path_cost_1:path_cost_0):7'd0);

   always @ (*)

   begin

      valid_o = 1'b1;

      case({path_0_valid,path_1_valid})

         2'b00:

         begin

            selection = 1'b0;

            valid_o   = 1'b0;

         end

         2'b01:   selection = 1'b1;

         2'b10:   selection = 1'b0;

         2'b11:   selection = (path_cost_0 > path_cost_1)?1'b1:1'b0;

       endcase

   end

endmodule