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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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