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Line 24... |
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_in_mantissa) + 1 = 5)
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parameter size_counter = 5, //log2(size_in_mantissa) + 1 = 5)
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parameter double_size_in_mantissa = size_in_mantissa + size_in_mantissa)
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parameter double_size_in_mantissa = size_in_mantissa + size_in_mantissa)
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( input [size_in_mantissa : 0] unnormalized_mantissa,
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( input [size_in_mantissa - 1 : 0] m_a_number,
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input [size_in_mantissa - 1 : 0] inter_rounding_bits,
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input [size_in_mantissa - 1 : 0] m_b_number,
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input [size_exponent : 0] exp_inter,
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input [size_exponent : 0] exp_inter,
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input exp_difference,
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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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output ovf);
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wire [size_counter - 1 : 0] lzs;
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wire [size_counter - 1 : 0] lzs;
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wire [size_exponent- 1 : 0] unadjusted_exponent;
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wire [size_exponent- 1 : 0] unadjusted_exponent;
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wire [size_in_mantissa + 1 : 0] dummy_bits;
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wire [2 : 0] dummy_bits;
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wire init_shft_bit, shft_bit;
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wire [size_in_mantissa-1: 0] shifted_m_b;
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wire [size_in_mantissa+1: 0] adder_mantissa;
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wire [size_in_mantissa : 0] unnormalized_mantissa;
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wire [size_in_mantissa : 0] rounded_mantissa;
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wire [size_in_mantissa-1: 0] r_mantissa;
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assign {shifted_m_b, init_shft_bit} = (exp_difference)? {1'b0, m_b_number[size_in_mantissa-1:1], m_b_number[0]} : {m_b_number, 1'b0};
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//compute unnormalized_mantissa
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assign adder_mantissa = {1'b0, m_a_number} - {1'b0, shifted_m_b};
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assign {unnormalized_mantissa, shft_bit} =
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(adder_mantissa[size_in_mantissa + 1])? ({~adder_mantissa[size_in_mantissa : 0], ~init_shft_bit}) :
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({adder_mantissa[size_in_mantissa : 0], init_shft_bit});
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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(size_in_mantissa + 1), .SIZE_COUNTER(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[size_in_mantissa : 0]),
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leading_zeros_instance (.a(unnormalized_mantissa[size_in_mantissa : 0]),
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.ovf(unnormalized_mantissa[size_in_mantissa]),
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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(double_size_in_mantissa + 1),
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shifter #( .INPUT_SIZE(size_in_mantissa + 2),
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.SHIFT_SIZE(size_counter),
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.SHIFT_SIZE(size_counter),
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.OUTPUT_SIZE(double_size_in_mantissa + 2),
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.OUTPUT_SIZE(size_in_mantissa + 3),
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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, inter_rounding_bits}),//mantissa
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shifter_instance( .a({unnormalized_mantissa, shft_bit}),//mantissa
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.arith(1'b0),//logical shift
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.arith(adder_mantissa[size_in_mantissa + 1]),//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({r_mantissa, dummy_bits}));
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assign rounded_mantissa = (adder_mantissa[size_in_mantissa + 1])? r_mantissa + 1'b1 : r_mantissa;
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assign resulted_m_o = (rounded_mantissa[size_in_mantissa])? rounded_mantissa[size_in_mantissa : 1] :
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rounded_mantissa[size_in_mantissa-1:0];
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assign ovf = adder_mantissa[size_in_mantissa+1];
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assign unadjusted_exponent = exp_inter - lzs;
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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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assign resulted_e_o = unadjusted_exponent + 1'b1;
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endmodule
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endmodule
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