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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 ClosePath #( parameter size_in_mantissa = 48, //1.M
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module ClosePath #( parameter size_in_mantissa = 24, //1.M
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parameter size_out_mantissa = 24,
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parameter size_out_mantissa = 24,
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parameter size_exponent = 8,
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parameter size_exponent = 8,
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parameter pipeline = 0,
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parameter pipeline = 0,
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parameter pipeline_pos = 0, // 8 bits
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parameter pipeline_pos = 0, // 8 bits
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parameter size_counter = 5, //log2(size_mantissa) + 1 = 5)
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parameter size_counter = 5, //log2(size_in_mantissa) + 1 = 5)
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parameter double_size_counter = size_counter + 1,
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parameter double_size_in_mantissa = size_in_mantissa + size_in_mantissa)
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parameter double_size_mantissa = size_in_mantissa + size_in_mantissa)
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( input [size_in_mantissa : 0] unnormalized_mantissa,
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( input eff_op,
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input [size_in_mantissa - 1 : 0] inter_rounding_bits,
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input [size_in_mantissa-1 :0] m_a_number,
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input [size_exponent : 0] exp_inter,
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input [size_in_mantissa-1 :0] m_b_number,
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input [size_exponent - 1 : 0] e_a_number,
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input [size_exponent - 1 : 0] e_b_number,
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output[size_out_mantissa-1:0] resulted_m_o,
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output[size_out_mantissa-1:0] resulted_m_o,
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output[size_exponent - 1 : 0] resulted_e_o);
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output[size_exponent - 1 : 0] resulted_e_o);
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wire [size_in_mantissa:0] unnormalized_mantissa;
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wire [size_counter - 1 : 0] lzs;
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wire [double_size_counter-1: 0] lzs;
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wire [size_exponent- 1 : 0] unadjusted_exponent;
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wire [size_out_mantissa + 1 : 0] dummy_bits;
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wire [size_in_mantissa + 1 : 0] dummy_bits;
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//compute unnormalized_mantissa
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assign unnormalized_mantissa = (eff_op)? ((m_a_number > m_b_number)? (m_a_number - m_b_number) : (m_b_number - m_a_number)) :
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m_a_number + m_b_number;
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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(double_size_mantissa + 1'b1), .SIZE_COUNTER(double_size_counter), .PIPELINE(pipeline))
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leading_zeros #( .SIZE_INT(size_in_mantissa + 1), .SIZE_COUNTER(size_counter), .PIPELINE(pipeline))
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leading_zeros_instance (.a(unnormalized_mantissa),
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leading_zeros_instance (.a(unnormalized_mantissa[size_in_mantissa : 0]),
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.ovf(1'b0),
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.ovf(unnormalized_mantissa[size_in_mantissa]),
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.lz(lzs));
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.lz(lzs));
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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(size_in_mantissa + 1'b1),
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shifter #( .INPUT_SIZE(double_size_in_mantissa + 1),
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.SHIFT_SIZE(double_size_counter),
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.SHIFT_SIZE(size_counter),
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.OUTPUT_SIZE(size_in_mantissa + 2'd2),
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.OUTPUT_SIZE(double_size_in_mantissa + 2),
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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(unnormalized_mantissa),//mantissa
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shifter_instance( .a({unnormalized_mantissa, inter_rounding_bits}),//mantissa
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.arith(1'b0),//logical shift
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.arith(1'b0),//logical shift
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.shft(lzs),
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.shft(lzs),
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.shifted_a({resulted_m_o, dummy_bits}));
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.shifted_a({resulted_m_o, dummy_bits}));
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assign resulted_e_o = (e_a_number > e_b_number)? (e_a_number - lzs + 1) : (e_b_number - lzs + 1);
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assign unadjusted_exponent = exp_inter - lzs;
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assign resulted_e_o = unadjusted_exponent + 1'b1;
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endmodule
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endmodule
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