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[/] [xilinx_virtex_fp_library/] [trunk/] [DualPathFPAdder/] [FarPath.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:    00:31:57 11/19/2013 
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// Design Name: 
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// Module Name:    FarPath 
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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 when |Ea-Eb| >= 2
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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 FarPath  #(      parameter size_in_mantissa                      = 24, //1.M
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                                                parameter size_out_mantissa             = 24,
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                                                parameter size_exponent                         = 8,
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                                                parameter pipeline                                      = 0,
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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 double_size_counter           = size_counter + 1,
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                                                parameter double_size_mantissa  = size_in_mantissa + size_in_mantissa)
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                                        (       input eff_op,
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                                                input [size_in_mantissa-1 :0] m_a_number,
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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_exponent - 1 : 0] resulted_e_o);
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        wire [double_size_mantissa:0] unnormalized_mantissa;
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        wire [7:0] adjust_mantissa;
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        wire [double_size_mantissa:0] normalized_mantissa;
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        wire dummy_bit;
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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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        assign adjust_mantissa = unnormalized_mantissa[double_size_mantissa]? 8'd0 :
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                                                                                unnormalized_mantissa[double_size_mantissa-1]? 2'd1 : 8'd2;
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        //compute shifting over unnormalized_mantissa
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        shifter #(      .INPUT_SIZE(double_size_mantissa+1),
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                                        .SHIFT_SIZE(size_exponent),
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                                        .OUTPUT_SIZE(double_size_mantissa+2),
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                                        .DIRECTION(1'b1),
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                                        .PIPELINE(pipeline),
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                                        .POSITION(pipeline_pos))
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                unnormalized_no_shifter_instance(.a(unnormalized_mantissa),
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                                                                                                        .arith(1'b0),
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                                                                                                        .shft(adjust_mantissa),
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                                                                                                        .shifted_a({normalized_mantissa, dummy_bit}));
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        //instantiate rounding_component
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        rounding #(     .SIZE_MOST_S_MANTISSA(size_out_mantissa),
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                                        .SIZE_LEAST_S_MANTISSA(size_out_mantissa + 2'd1))
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                rounding_instance(      .unrounded_mantissa(normalized_mantissa[double_size_mantissa : double_size_mantissa - size_out_mantissa + 1]),
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                                                                        .dummy_bits(normalized_mantissa[double_size_mantissa - size_out_mantissa: 0]),
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                                                                        .rounded_mantissa(resulted_m_o));
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        assign resulted_e_o = (e_a_number > e_b_number)? (e_a_number + 1 - adjust_mantissa):(e_b_number + 1 - adjust_mantissa);
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endmodule

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