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[/] [xilinx_virtex_fp_library/] [trunk/] [DualPathFPAdder/] [DualPathFPAdder.v] - Blame information for rev 8

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Line No. Rev Author Line
1 8 constantin
`timescale 1ns / 1ps
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//////////////////////////////////////////////////////////////////////////////////
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// Company: 
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// Engineer: 
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// 
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// Create Date:    00:31:28 11/19/2013 
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// Design Name: 
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// Module Name:    DualPathFPAdder 
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// Project Name: 
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// Target Devices: 
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// Tool versions: 
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// Description: A  B
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//
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// Dependencies: 
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//
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// Revision: 
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// Revision 0.01 - File Created
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// Additional Comments: 
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//
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//////////////////////////////////////////////////////////////////////////////////
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module DualPathFPAdder #(       parameter size_mantissa                         = 24, //1.M
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                                                                        parameter size_exponent                         = 8,
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                                                                        parameter size_exception_field  = 2,
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                                                                        parameter size_counter                          = 5,    //log2(size_mantissa) + 1 = 5)
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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] infinity                = 2, //10
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                                                                        parameter [size_exception_field - 1 : 0] NaN                             = 3, //11
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                                                                        parameter pipeline                                      = 0,
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                                                                        parameter pipeline_pos                          = 0,     // 8 bits
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                                                                        parameter double_size_mantissa  = size_mantissa + size_mantissa,
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                                                                        parameter double_size_counter           = size_counter + 1,
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                                                                        parameter size  = size_mantissa + size_exponent + size_exception_field)
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                                                                        (sub, a_number_i, b_number_i, resulted_number_o);
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        input sub;
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        input [size - 1 : 0] a_number_i;
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        input [size - 1 : 0] b_number_i;
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        output[size - 1 : 0] resulted_number_o;
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        wire [size_mantissa - 1 : 0] m_a_number, m_b_number;
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        wire [size_exponent - 1 : 0] e_a_number, e_b_number;
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        wire s_a_number, s_b_number;
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        wire [size_exception_field - 1 : 0] sp_case_a_number, sp_case_b_number;
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        wire [size_exponent - 1 : 0] exp_difference;
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        wire [size_exponent - 1 : 0] modify_exp_a, modify_exp_b;
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        wire [double_size_mantissa - 1 : 0] shifted_m_a, shifted_m_b;
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        wire [size_mantissa-1 : 0] fp_resulted_m_o, cp_resulted_m_o;
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        wire [size_exponent-1 : 0] fp_resulted_e_o, cp_resulted_e_o;
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        wire resulted_sign;
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        wire [size_exception_field - 1 : 0] resulted_exception_field;
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        assign m_a_number = {1'b1, a_number_i[size_mantissa - 2 :0]};
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        assign m_b_number       = {1'b1, b_number_i[size_mantissa - 2 :0]};
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        assign e_a_number       = a_number_i[size_mantissa + size_exponent - 1 : size_mantissa - 1];
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        assign e_b_number = b_number_i[size_mantissa + size_exponent - 1 : size_mantissa - 1];
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        assign s_a_number = a_number_i[size - size_exception_field - 1];
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        assign s_b_number = b_number_i[size - size_exception_field - 1];
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        assign sp_case_a_number = a_number_i[size - 1 : size - size_exception_field];
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        assign sp_case_b_number = b_number_i[size - 1 : size - size_exception_field];
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        //find the difference between exponents
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        assign exp_difference = (e_a_number > e_b_number)? (e_a_number - e_b_number) : (e_b_number - e_a_number);
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        assign {modify_exp_a, modify_exp_b} = (e_a_number > e_b_number)? {8'd0, exp_difference} : {exp_difference, 8'd0};
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        //shift the right mantissa
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        shifter #(      .INPUT_SIZE(size_mantissa),
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                                        .SHIFT_SIZE(size_exponent),
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                                        .OUTPUT_SIZE(double_size_mantissa),
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                                        .DIRECTION(1'b0),
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                                        .PIPELINE(pipeline),
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                                        .POSITION(pipeline_pos))
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                m_a_shifter_instance(   .a(m_a_number),
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                                                                                .arith(1'b0),
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                                                                                .shft(modify_exp_a),
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                                                                                .shifted_a(shifted_m_a));
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        shifter #(      .INPUT_SIZE(size_mantissa),
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                                        .SHIFT_SIZE(size_exponent),
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                                        .OUTPUT_SIZE(double_size_mantissa),
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                                        .DIRECTION(1'b0),
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                                        .PIPELINE(pipeline),
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                                        .POSITION(pipeline_pos))
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                m_b_shifter_instance(   .a(m_b_number),
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                                                                                .arith(1'b0),
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                                                                                .shft(modify_exp_b),
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                                                                                .shifted_a(shifted_m_b));
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        //istantiate effective_operation_component
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                effective_op effective_op_instance( .a_sign(s_a_number), .b_sign(s_b_number), .sub(sub), .eff_op(eff_op));
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        //instantiate special_cases component
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        special_cases #(        .size_exception_field(size_exception_field),
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                                                        .zero(zero),
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                                                        .normal_number(normal_number),
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                                                        .infinity(infinity),
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                                                        .NaN(NaN))
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                special_cases_instance  (       .sp_case_a_number(sp_case_a_number),
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                                                                                        .sp_case_b_number(sp_case_b_number),
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                                                                                        .sp_case_result_o(resulted_exception_field));
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        //instantiate FarPath component
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        FarPath #(      .size_in_mantissa(double_size_mantissa),
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                                        .size_out_mantissa(size_mantissa),
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                                        .size_exponent(size_exponent),
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                                        .pipeline(pipeline),
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                                        .pipeline_pos(pipeline_pos),
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                                        .size_counter(size_counter),
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                                        .double_size_counter(double_size_counter),
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                                        .double_size_mantissa(double_size_mantissa))
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                FarPath_instance (      .eff_op(eff_op),
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                                                                        .m_a_number(shifted_m_a),
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                                     .m_b_number(shifted_m_b),
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                                     .e_a_number(e_a_number),
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                                     .e_b_number(e_b_number),
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                                     .resulted_m_o(fp_resulted_m_o),
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                                                                        .resulted_e_o(fp_resulted_e_o));
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//instantiate ClosePath component
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        ClosePath #(.size_in_mantissa(double_size_mantissa),
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                                        .size_out_mantissa(size_mantissa),
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                                        .size_exponent(size_exponent),
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                                        .pipeline(pipeline),
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                                        .pipeline_pos(pipeline_pos),
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                                        .size_counter(size_counter),
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                                        .double_size_counter(double_size_counter),
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                                        .double_size_mantissa(double_size_mantissa))
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                ClosePath_instance(     .eff_op(eff_op),
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                                                                        .m_a_number(shifted_m_a),
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                                     .m_b_number(shifted_m_b),
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                                     .e_a_number(e_a_number),
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                                     .e_b_number(e_b_number),
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                                     .resulted_m_o(cp_resulted_m_o),
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                                                                        .resulted_e_o(cp_resulted_e_o));
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        assign resulted_sign = (eff_op)? ((shifted_m_a > shifted_m_b)? s_a_number : ~s_a_number) : s_a_number;
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        assign resulted_number_o = (exp_difference > 1)?        {resulted_exception_field, resulted_sign, fp_resulted_e_o, fp_resulted_m_o[size_mantissa-2 : 0]}:
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                                                                                                                                                {resulted_exception_field, resulted_sign, cp_resulted_e_o, cp_resulted_m_o[size_mantissa-2 : 0]};
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endmodule

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