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[/] [xilinx_virtex_fp_library/] [trunk/] [DualPathFPAdderMappedConversions/] [special_cases.v] - Diff between revs 11 and 19

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Rev 11 Rev 19
`timescale 1ns / 1ps
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Company:     UPT     
// Engineer: 
// Engineer:    Constantina-Elena Gavriliu
// 
// 
// Create Date:    18:56:11 10/07/2013 
// Create Date:    18:56:11 10/07/2013 
// Design Name: 
// Design Name: 
// Module Name:    special_cases_mul_acc
// Module Name:    special_cases
// Project Name: 
// Project Name: 
// Target Devices: 
// Target Devices: 
// Tool versions: 
// Tool versions: 
// Description: 
// Description: Compute corresponding special cases (exceptions)
//
//                              //do not take into consideration cases for which the operation generates a NaN or Infinity exception (with corresponding sign) when initial "special cases" are not such exceptions
// Dependencies: 
// Dependencies:        SinglePathFPAdder
//
//
// Revision: 
// Revision: 
// Revision 0.01 - File Created
// Revision 0.01 - File Created
// Additional Comments: 
// Additional Comments: 
//
//
//////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////
module special_cases            #(      parameter size_exception_field = 2'd2,
module special_cases            #(      parameter size_exception_field = 2'd2,
                                                                        parameter [size_exception_field - 1 : 0] zero                    = 0, //00
                                                                        parameter [size_exception_field - 1 : 0] zero                    = 0, //00
                                                                        parameter [size_exception_field - 1 : 0] normal_number= 1, //01
                                                                        parameter [size_exception_field - 1 : 0] normal_number= 1, //01
                                                                        parameter [size_exception_field - 1 : 0] infinity                = 2, //10
                                                                        parameter [size_exception_field - 1 : 0] infinity                = 2, //10
                                                                        parameter [size_exception_field - 1 : 0] NaN                             = 3) //11
                                                                        parameter [size_exception_field - 1 : 0] NaN                             = 3) //11
                                                                (       input [size_exception_field - 1 : 0] sp_case_a_number,
                                                                (       input [size_exception_field - 1 : 0] sp_case_a_number,
                                                                        input [size_exception_field - 1 : 0] sp_case_b_number,
                                                                        input [size_exception_field - 1 : 0] sp_case_b_number,
                                                                        output reg [size_exception_field - 1 : 0] sp_case_result_o);
                                                                        output reg [size_exception_field - 1 : 0] sp_case_result_o);
 
 
        always
        always
                @(*)
                @(*)
        begin
        begin
                case ({sp_case_a_number, sp_case_b_number})
                case ({sp_case_a_number, sp_case_b_number})
                        {zero, zero}:                                                   sp_case_result_o = zero;
                        {zero, zero}:                                                   sp_case_result_o = zero;
                        {zero, normal_number}:                          sp_case_result_o = normal_number;
                        {zero, normal_number}:                          sp_case_result_o = normal_number;
                        {zero, infinity}:                                       sp_case_result_o = infinity;
                        {zero, infinity}:                                       sp_case_result_o = infinity;
                        {zero, NaN}:                                                    sp_case_result_o = NaN;
                        {zero, NaN}:                                                    sp_case_result_o = NaN;
 
 
                        {normal_number,zero}:                           sp_case_result_o = normal_number;
                        {normal_number,zero}:                           sp_case_result_o = normal_number;
                        {normal_number,normal_number}:  sp_case_result_o = normal_number;
                        {normal_number,normal_number}:  sp_case_result_o = normal_number;
                        {normal_number,infinity}:                       sp_case_result_o = infinity;
                        {normal_number,infinity}:                       sp_case_result_o = infinity;
                        {normal_number,NaN}:                                    sp_case_result_o = NaN;
                        {normal_number,NaN}:                                    sp_case_result_o = NaN;
 
 
                        {infinity, zero}:                                       sp_case_result_o = infinity;
                        {infinity, zero}:                                       sp_case_result_o = infinity;
                        {infinity, normal_number}:              sp_case_result_o = infinity;
                        {infinity, normal_number}:              sp_case_result_o = infinity;
                        {infinity, infinity}:                           sp_case_result_o = infinity;
                        {infinity, infinity}:                           sp_case_result_o = infinity;
                        {infinity, NaN}:                                                sp_case_result_o = NaN;
                        {infinity, NaN}:                                                sp_case_result_o = NaN;
 
 
                        {NaN, zero}:                                                    sp_case_result_o = NaN;
                        {NaN, zero}:                                                    sp_case_result_o = NaN;
                        {NaN, normal_number}:                           sp_case_result_o = NaN;
                        {NaN, normal_number}:                           sp_case_result_o = NaN;
                        {NaN, infinity}:                                                sp_case_result_o = NaN;
                        {NaN, infinity}:                                                sp_case_result_o = NaN;
                        {NaN, NaN}:                                                     sp_case_result_o = NaN;
                        {NaN, NaN}:                                                     sp_case_result_o = NaN;
                        default:                                                                        sp_case_result_o = zero;
                        default:                                                                        sp_case_result_o = zero;
                endcase
                endcase
        end
        end
 
 
endmodule
endmodule
 
 

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