`timescale 1ns / 1ps
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`timescale 1ns / 1ps
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//////////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////////
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// Company:
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// Company: UPT
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// Engineer:
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// Engineer: Constantina-Elena Gavriliu
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//
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//
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// Create Date: 18:56:11 10/07/2013
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// Create Date: 18:56:11 10/07/2013
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// Design Name:
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// Design Name:
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// Module Name: special_cases_mul_acc
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// Module Name: special_cases
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// Project Name:
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// Project Name:
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// Target Devices:
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// Target Devices:
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// Tool versions:
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// Tool versions:
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// Description:
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// Description: Compute corresponding special cases (exceptions)
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//
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// //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
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// Dependencies:
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// Dependencies: SinglePathFPAdder
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//
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//
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// Revision:
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// Revision:
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// Revision 0.01 - File Created
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// Revision 0.01 - File Created
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// Additional Comments:
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// Additional Comments:
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//
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//
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//////////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////////
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module special_cases #( parameter size_exception_field = 2'd2,
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module special_cases #( parameter size_exception_field = 2'd2,
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parameter [size_exception_field - 1 : 0] zero = 0, //00
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parameter [size_exception_field - 1 : 0] zero = 0, //00
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parameter [size_exception_field - 1 : 0] normal_number= 1, //01
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parameter [size_exception_field - 1 : 0] normal_number = 1, //01
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parameter [size_exception_field - 1 : 0] infinity = 2, //10
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parameter [size_exception_field - 1 : 0] infinity = 2, //10
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parameter [size_exception_field - 1 : 0] NaN = 3) //11
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parameter [size_exception_field - 1 : 0] NaN = 3) //11
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( input [size_exception_field - 1 : 0] sp_case_a_number,
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( input [size_exception_field - 1 : 0] sp_case_a_number,
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input [size_exception_field - 1 : 0] sp_case_b_number,
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input [size_exception_field - 1 : 0] sp_case_b_number,
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input eff_op,
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output reg [size_exception_field - 1 : 0] sp_case_result_o);
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output reg [size_exception_field - 1 : 0] sp_case_result_o);
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always
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always
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@(*)
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@(*)
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begin
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begin
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case ({sp_case_a_number, sp_case_b_number})
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case ({sp_case_a_number, sp_case_b_number})
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{zero, zero}: sp_case_result_o = zero;
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{zero, zero}: sp_case_result_o = zero;
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{zero, normal_number}: sp_case_result_o = normal_number;
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{zero, normal_number}: sp_case_result_o = normal_number;
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{zero, infinity}: sp_case_result_o = infinity;
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{zero, infinity}: sp_case_result_o = infinity;
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{zero, NaN}: sp_case_result_o = NaN;
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{zero, NaN}: sp_case_result_o = NaN;
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{normal_number,zero}: sp_case_result_o = normal_number;
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{normal_number,zero}: sp_case_result_o = normal_number;
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{normal_number,normal_number}: sp_case_result_o = normal_number;
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{normal_number,normal_number}: sp_case_result_o = normal_number;
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{normal_number,infinity}: sp_case_result_o = infinity;
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{normal_number,infinity}: sp_case_result_o = infinity;
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{normal_number,NaN}: sp_case_result_o = NaN;
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{normal_number,NaN}: sp_case_result_o = NaN;
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{infinity, zero}: sp_case_result_o = infinity;
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{infinity, zero}: sp_case_result_o = infinity;
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{infinity, normal_number}: sp_case_result_o = infinity;
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{infinity, normal_number}: sp_case_result_o = infinity;
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{infinity, infinity}: sp_case_result_o = infinity;
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{infinity, infinity}: sp_case_result_o = infinity;
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{infinity, NaN}: sp_case_result_o = NaN;
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{infinity, NaN}: sp_case_result_o = NaN;
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{NaN, zero}: sp_case_result_o = NaN;
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{NaN, zero}: sp_case_result_o = NaN;
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{NaN, normal_number}: sp_case_result_o = NaN;
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{NaN, normal_number}: sp_case_result_o = NaN;
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{NaN, infinity}: sp_case_result_o = NaN;
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{NaN, infinity}: sp_case_result_o = NaN;
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{NaN, NaN}: sp_case_result_o = NaN;
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{NaN, NaN}: sp_case_result_o = NaN;
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default: sp_case_result_o = zero;
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default: sp_case_result_o = zero;
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endcase
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endcase
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end
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end
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endmodule
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endmodule
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