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`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: 16:09:49 11/04/2013
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// Create Date: 16:09:49 11/04/2013
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// Design Name:
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// Design Name:
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// Module Name: SinglePathAdderConversion
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// Module Name: SinglePathAdderConversion
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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: A ± B with mapped conversions
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// Description: A ± B with mapped conversions
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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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//
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//
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// Dependencies:
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// Dependencies: effective_op.v
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// leading_zeros.v
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// rounding.v
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// shifter.v
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// special_cases.v:
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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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| Line 61... |
Line 67... |
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wire [size_exponent - 1 : 0] exp_difference;
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wire [size_exponent - 1 : 0] exp_difference;
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wire [size_exponent : 0] exp_inter;
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wire [size_exponent : 0] exp_inter;
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wire [size_mantissa - 1 : 0] shifted_m_b, convert_neg_mantissa, mantissa_to_shift;
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wire [size_mantissa - 1 : 0] shifted_m_b, convert_neg_mantissa, mantissa_to_shift;
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wire [size_mantissa - 1 : 0] initial_rounding_bits, inter_rounding_bits;
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wire [size_mantissa - 1 : 0] initial_rounding_bits, final_rounding_bits;
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wire [size_mantissa - 2 : 0] inter_rounding_bits;
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wire eff_op;
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wire eff_op;
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wire [size_mantissa + 1 : 0] adder_mantissa;
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wire [size_mantissa + 2 : 0] adder_mantissa;
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wire [size_mantissa : 0] unnormalized_mantissa;
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wire [size_mantissa + 1 : 0] unnormalized_mantissa;
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wire [size_exception_field - 1 : 0] sp_case_o, resulted_exception_field;
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wire [size_exception_field - 1 : 0] sp_case_o, resulted_exception_field;
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wire [size_mantissa - 1 : 0] resulted_mantissa;
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wire [size_mantissa - 1 : 0] resulted_mantissa;
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wire [size_exponent - 1 : 0] resulted_exponent;
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wire [size_exponent - 1 : 0] resulted_exponent;
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wire resulted_sign;
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wire resulted_sign;
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wire zero_flag;
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wire zero_flag;
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wire [size_exponent : 0] subtracter;
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wire [size_exponent : 0] subtracter;
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wire [max_size - size_mantissa : 0] dummy_bits;
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wire [max_size : 0] dummy_bits;
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wire [size_exponent : 0] shift_value_when_positive_exponent, shift_value_when_negative_exponent;
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wire [size_exponent : 0] shift_value_when_positive_exponent, shift_value_when_negative_exponent;
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wire [size_exponent - 1 : 0] shift_value, shft_val;
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wire [size_exponent - 1 : 0] shift_value, shft_val;
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wire lsb_shft_bit;
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wire lsb_shft_bit;
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wire [size_exponent - 1 : 0] max_resulted_e_o;
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wire [size_exponent - 1 : 0] max_resulted_e_o;
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wire [size_exponent - 1 : 0] max_unadjusted_exponent, max_adjust_exponent;
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wire [size_exponent - 1 : 0] max_unadjusted_exponent, max_adjust_exponent;
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wire [size_exponent - 1 : 0] max_exp_selection;
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wire [size_exponent - 1 : 0] max_exp_selection;
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wire [size_mantissa - 1 : 0] r_mantissa;
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wire [size_mantissa - 1 : 0] r_mantissa;
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wire [size_mantissa : 0] max_rounded_mantissa;
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wire [max_size : 0] max_rounded_mantissa;
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wire [max_counter - 1 : 0] max_lzs;
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wire [max_counter - 1 : 0] max_lzs;
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wire [max_size - 1 : 0] max_entityINT_FP, max_entityFP_INT;
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wire [max_size - 1 : 0] max_entityINT_FP;
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wire [max_size - 1 : 0] init_entityFP_INT, max_entityFP_INT;
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wire arith_shift;
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wire arith_shift;
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wire max_ovf;
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wire max_ovf;
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reg intermediar_sign;
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wire [4:0] sign_cases;
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wire do_conversion;
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wire do_conversion;
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wire dummy_ovf, correction, negation_cond;
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assign do_conversion = |conversion; //let me know if there is a conversion
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assign do_conversion = |conversion; //let me know if there is a conversion
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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_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 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_a_number = a_number_i[size - size_exception_field - 1];
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| Line 141... |
Line 153... |
m_b_shifter_instance( .a(mantissa_to_shift),//mantissa
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m_b_shifter_instance( .a(mantissa_to_shift),//mantissa
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.arith(arith_shift),//logical shift
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.arith(arith_shift),//logical shift
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.shft(shft_val),
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.shft(shft_val),
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.shifted_a({shifted_m_b, initial_rounding_bits}));
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.shifted_a({shifted_m_b, initial_rounding_bits}));
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assign max_entityFP_INT = {s_a_number, shifted_m_b[size_mantissa-1 : 0], initial_rounding_bits[size_mantissa-1 : size_mantissa - size_diff_i_m + 1]};
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//istantiate effective_operation_component
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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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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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//compute unnormalized_mantissa
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///compute addition
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assign adder_mantissa = (eff_op)? ({1'b0, m_a_number} - {1'b0, shifted_m_b}) : ({1'b0, m_a_number} + {1'b0, shifted_m_b});
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assign adder_mantissa = (eff_op)? ({1'b0, m_a_number, 1'b0} - {1'b0, shifted_m_b, initial_rounding_bits[size_mantissa - 1]}) :
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assign {unnormalized_mantissa, inter_rounding_bits} =
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(adder_mantissa[size_mantissa + 1])? ({~adder_mantissa[size_mantissa : 0], ~initial_rounding_bits}) :
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({adder_mantissa[size_mantissa : 0], initial_rounding_bits});
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assign max_entityINT_FP = do_conversion? (s_a_number? (~a_number_i[max_size-1 : 0]) : a_number_i[max_size-1 : 0]) :
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({1'b0, m_a_number, 1'b0} + {1'b0, shifted_m_b, initial_rounding_bits[size_mantissa - 1]});
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{{(max_size-size_mantissa-1){1'b0}}, unnormalized_mantissa[size_mantissa : 0]};
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assign lsb_shft_bit = (do_conversion)? s_a_number : max_entityINT_FP[0];
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//compute unnormalized_mantissa
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assign unnormalized_mantissa = (adder_mantissa[size_mantissa + 2])? ~adder_mantissa[size_mantissa + 1 : 0] : adder_mantissa[size_mantissa + 1 : 0];
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assign inter_rounding_bits = (~(|exp_difference[size_exponent - 1 : 1]))?
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((adder_mantissa[size_mantissa + 2]? ~initial_rounding_bits[size_mantissa - 2 : 0] : initial_rounding_bits[size_mantissa - 2 : 0])) :
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((eff_op)? ((|initial_rounding_bits[size_mantissa - 2 : 0])?~initial_rounding_bits[size_mantissa - 2 : 0] : initial_rounding_bits[size_mantissa - 2 : 0]) : initial_rounding_bits[size_mantissa - 2 : 0]);
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assign max_entityINT_FP = do_conversion? (a_number_i[size_integer-1]? (~a_number_i[max_size-1 : 0]) : a_number_i[max_size-1 : 0]) :
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{{(max_size-size_mantissa-2){1'b0}}, unnormalized_mantissa[size_mantissa + 1 : 0]};
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assign lsb_shft_bit = (do_conversion)? (conversion[0]? s_a_number : a_number_i[size_integer-1]) : inter_rounding_bits[0];
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assign max_ovf = do_conversion? 1'b0 : unnormalized_mantissa[size_mantissa];
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//compute leading_zeros over unnormalized mantissa
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//compute leading_zeros over unnormalized mantissa
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leading_zeros #( .SIZE_INT(max_size), .SIZE_COUNTER(max_counter), .PIPELINE(pipeline))
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leading_zeros #( .SIZE_INT(max_size), .SIZE_COUNTER(max_counter), .PIPELINE(pipeline))
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leading_zeros_instance (.a(max_entityINT_FP),
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leading_zeros_instance (.a(max_entityINT_FP),
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.ovf(max_ovf),
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.ovf(1'b0),
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.lz(max_lzs));
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.lz(max_lzs));
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assign final_rounding_bits = conversion[1]? {size_mantissa{a_number_i[size_integer-1]}} : {inter_rounding_bits, inter_rounding_bits[0]};
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//compute shifting over unnormalized_mantissa
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//compute shifting over unnormalized_mantissa
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shifter #( .INPUT_SIZE(max_size),
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shifter #( .INPUT_SIZE(max_size + size_mantissa),
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.SHIFT_SIZE(max_counter),
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.SHIFT_SIZE(max_counter),
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.OUTPUT_SIZE(max_size + 1),
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.OUTPUT_SIZE(max_size + size_mantissa + 1),
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.DIRECTION(1'b1), //0=right, 1=left
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.DIRECTION(1'b1), //0=right, 1=left
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.PIPELINE(pipeline),
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.PIPELINE(pipeline),
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.POSITION(pipeline_pos))
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.POSITION(pipeline_pos))
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shifter_instance( .a(max_entityINT_FP),//mantissa
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shifter_instance( .a({max_entityINT_FP, final_rounding_bits}),//mantissa
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.arith(lsb_shft_bit),//logical shift
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.arith(lsb_shft_bit),//logical shift
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.shft(max_lzs),
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.shft(max_lzs),
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.shifted_a({r_mantissa, dummy_bits}));
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.shifted_a({r_mantissa, dummy_bits}));
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wire [max_size - 1 : 0] entity_to_shift;
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wire [max_size : 0] dummy_entity;
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assign entity_to_shift = conversion[0]? {shifted_m_b, initial_rounding_bits[size_mantissa-1 : size_mantissa - size_diff_i_m + 1]} : {{size_diff_i_m{1'b0}},r_mantissa};
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assign dummy_entity = conversion[0]? {initial_rounding_bits[size_mantissa - size_diff_i_m : 0], {(max_size + size_diff_i_m - size_mantissa){1'b0}}} :
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((conversion[1] & (&dummy_bits[max_size-1:0]) & (~dummy_bits[max_size]))? (a_number_i[size_integer-1]? ~dummy_bits : dummy_bits) : dummy_bits);
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assign correction = ~(|exp_difference[size_exponent - 1 : 1])? 1'b0 :
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(eff_op? ((|initial_rounding_bits[size_mantissa - 2 : 0])?
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((adder_mantissa[0] | ((~adder_mantissa[0]) & (~adder_mantissa[size_mantissa]) & (~initial_rounding_bits[size_mantissa - 1])
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& (~(&final_rounding_bits[size_mantissa-2 : 0]))))? 1'b1 : 1'b0) : 1'b0) : 1'b0);
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//instantiate rounding_component
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//instantiate rounding_component
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rounding #( .SIZE_MOST_S_MANTISSA(size_mantissa + 1),
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rounding #( .SIZE_MOST_S_MANTISSA(max_size + 1),
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.SIZE_LEAST_S_MANTISSA(max_size - size_mantissa + 1))
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.SIZE_LEAST_S_MANTISSA(max_size + 1))
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rounding_instance( .unrounded_mantissa({1'b0,r_mantissa}),
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rounding_instance( .unrounded_mantissa({1'b0,entity_to_shift}),
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.dummy_bits(dummy_bits),
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.dummy_bits(dummy_entity),
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.correction(correction),
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.rounded_mantissa(max_rounded_mantissa));
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.rounded_mantissa(max_rounded_mantissa));
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assign max_entityFP_INT = {s_a_number, max_rounded_mantissa[max_size - 2 : 0]};
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assign max_exp_selection = do_conversion? exponent : exp_inter;
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assign max_exp_selection = do_conversion? exponent : exp_inter-1'b1;
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assign max_adjust_exponent = max_exp_selection - max_lzs;
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assign max_adjust_exponent = max_exp_selection - max_lzs;
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assign max_unadjusted_exponent = max_adjust_exponent + size_diff_i_m;
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assign max_unadjusted_exponent = max_adjust_exponent + size_diff_i_m;
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assign max_resulted_e_o = (do_conversion & ~(|max_entityINT_FP))? bias : max_unadjusted_exponent + max_rounded_mantissa[size_mantissa];
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assign max_resulted_e_o = (do_conversion & ~(|max_entityINT_FP))? bias : max_unadjusted_exponent + max_rounded_mantissa[size_mantissa];
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assign resulted_exponent = conversion[0]? max_entityFP_INT[size_mantissa+size_exponent-2 : size_mantissa-1] : max_resulted_e_o;
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assign resulted_exponent = conversion[0]? max_entityFP_INT[size_mantissa+size_exponent-2 : size_mantissa-1] : max_resulted_e_o;
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assign resulted_mantissa = conversion[0]? max_entityFP_INT[size_mantissa-1 : 0] :
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assign resulted_mantissa = conversion[0]? max_entityFP_INT[size_mantissa-1 : 0] :
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(max_rounded_mantissa[size_mantissa])? (max_rounded_mantissa[size_mantissa : 1]) :
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(max_rounded_mantissa[size_mantissa])? (max_rounded_mantissa[size_mantissa : 1]) :
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(max_rounded_mantissa[size_mantissa-1 : 0]);
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(max_rounded_mantissa[size_mantissa-1 : 0]);
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//compute exception_field
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//compute exception_field
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special_cases #( .size_exception_field(size_exception_field),
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special_cases #( .size_exception_field(size_exception_field),
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.zero(zero),
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.zero(zero),
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.normal_number(normal_number),
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.normal_number(normal_number),
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.infinity(infinity),
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.infinity(infinity),
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| Line 211... |
Line 241... |
assign resulted_exception_field = do_conversion? sp_case_a_number : sp_case_o;
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assign resulted_exception_field = do_conversion? sp_case_a_number : sp_case_o;
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//set zero_flag in case of equal numbers
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//set zero_flag in case of equal numbers
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assign zero_flag = ~((|{resulted_mantissa,sp_case_o[1]}) & (|sp_case_o));
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assign zero_flag = ~((|{resulted_mantissa,sp_case_o[1]}) & (|sp_case_o));
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//compute resulted_sign
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assign sign_cases = {eff_op, s_a_number, s_b_number, a_greater_exponent[size_exponent], b_greater_exponent[size_exponent]};
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assign resulted_sign = do_conversion? s_a_number : ((eff_op)?
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(!a_greater_exponent[size_exponent]? (!b_greater_exponent[size_exponent]? ~adder_mantissa[size_mantissa+1] : s_a_number) : ~s_b_number) :
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s_a_number);
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assign resulted_number_o = (zero_flag)? {size{1'b0}} :
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always
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@(*)
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begin
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case (sign_cases)
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5'b00000: intermediar_sign = 1'b0;
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5'b00001: intermediar_sign = 1'b0;
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5'b00010: intermediar_sign = 1'b0;
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5'b10000: intermediar_sign = ~adder_mantissa[size_mantissa+1];
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5'b10001: intermediar_sign = 1'b0;
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5'b10010: intermediar_sign = 1'b1;
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5'b10100: intermediar_sign = ~adder_mantissa[size_mantissa+1];
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5'b10101: intermediar_sign = 1'b0;
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5'b10110: intermediar_sign = 1'b1;
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5'b00100: intermediar_sign = 1'b0;
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5'b00101: intermediar_sign = 1'b0;
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5'b00110: intermediar_sign = 1'b0;
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5'b11000: intermediar_sign = adder_mantissa[size_mantissa+1];
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5'b11001: intermediar_sign = 1'b1;
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5'b11010: intermediar_sign = 1'b0;
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5'b01000: intermediar_sign = 1'b1;
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5'b01001: intermediar_sign = 1'b1;
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5'b01010: intermediar_sign = 1'b1;
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5'b01100: intermediar_sign = 1'b1;
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5'b01101: intermediar_sign = 1'b1;
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5'b01110: intermediar_sign = 1'b1;
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5'b11100: intermediar_sign = adder_mantissa[size_mantissa+1];
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5'b11101: intermediar_sign = 1'b1;
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5'b11110: intermediar_sign = 1'b0;
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default: intermediar_sign = 1'b1;
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endcase
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end
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assign resulted_sign = do_conversion? s_a_number : intermediar_sign;
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assign resulted_number_o = do_conversion? {resulted_exception_field, resulted_sign, resulted_exponent, resulted_mantissa[size_mantissa - 2 : 0]} :
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(zero_flag | (~(|resulted_exception_field)))? {size{1'b0}} :
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(&(resulted_exception_field))? {resulted_exception_field, resulted_sign,{(size-1-size_exception_field){1'b0}}} :
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(resulted_exception_field[1])? {resulted_exception_field, {(size-size_exception_field){1'b0}}} :
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(!sp_case_a_number)? {b_number_i[size-1 : size-size_exception_field], resulted_sign, b_number_i[size-1-size_exception_field-1 : 0]} :
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(!sp_case_b_number)? {a_number_i[size-1 : size-size_exception_field], resulted_sign, a_number_i[size-1-size_exception_field-1 : 0]} :
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{resulted_exception_field, resulted_sign, resulted_exponent, resulted_mantissa[size_mantissa - 2 : 0]};
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{resulted_exception_field, resulted_sign, resulted_exponent, resulted_mantissa[size_mantissa - 2 : 0]};
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endmodule
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endmodule
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No newline at end of file
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No newline at end of file
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