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[/] [xilinx_virtex_fp_library/] [trunk/] [DualPathFPAdder/] [ClosePath.v] - Rev 9
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`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: // Engineer: // // Create Date: 00:32:10 11/19/2013 // Design Name: // Module Name: ClosePath // Project Name: // Target Devices: // Tool versions: // Description: A ± B when |Ea-Eb| < 2 // // Dependencies: // // Revision: // Revision 0.01 - File Created // Additional Comments: // ////////////////////////////////////////////////////////////////////////////////// module ClosePath #( parameter size_in_mantissa = 24, //1.M parameter size_out_mantissa = 24, parameter size_exponent = 8, parameter pipeline = 0, parameter pipeline_pos = 0, // 8 bits parameter size_counter = 5, //log2(size_in_mantissa) + 1 = 5) parameter double_size_in_mantissa = size_in_mantissa + size_in_mantissa) ( input [size_in_mantissa : 0] unnormalized_mantissa, input [size_in_mantissa - 1 : 0] inter_rounding_bits, input [size_exponent : 0] exp_inter, output[size_out_mantissa-1:0] resulted_m_o, output[size_exponent - 1 : 0] resulted_e_o); wire [size_counter - 1 : 0] lzs; wire [size_exponent- 1 : 0] unadjusted_exponent; wire [size_in_mantissa + 1 : 0] dummy_bits; //compute leading_zeros over unnormalized mantissa leading_zeros #( .SIZE_INT(size_in_mantissa + 1), .SIZE_COUNTER(size_counter), .PIPELINE(pipeline)) leading_zeros_instance (.a(unnormalized_mantissa[size_in_mantissa : 0]), .ovf(unnormalized_mantissa[size_in_mantissa]), .lz(lzs)); //compute shifting over unnormalized_mantissa shifter #( .INPUT_SIZE(double_size_in_mantissa + 1), .SHIFT_SIZE(size_counter), .OUTPUT_SIZE(double_size_in_mantissa + 2), .DIRECTION(1'b1), //0=right, 1=left .PIPELINE(pipeline), .POSITION(pipeline_pos)) shifter_instance( .a({unnormalized_mantissa, inter_rounding_bits}),//mantissa .arith(1'b0),//logical shift .shft(lzs), .shifted_a({resulted_m_o, dummy_bits})); assign unadjusted_exponent = exp_inter - lzs; assign resulted_e_o = unadjusted_exponent + 1'b1; endmodule
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