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[/] [xilinx_virtex_fp_library/] [trunk/] [SinglePathFPAdder/] [rounding.v] - Rev 8
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`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: // Engineer: // // Create Date: 16:09:49 11/04/2013 // Design Name: // Module Name: rounding // Project Name: // Target Devices: // Tool versions: // Description: A ± B // // Dependencies: // // Revision: // Revision 0.01 - File Created // Additional Comments: // ////////////////////////////////////////////////////////////////////////////////// module rounding #( parameter SIZE_MOST_S_MANTISSA = 24, parameter SIZE_LEAST_S_MANTISSA= 25) ( input [SIZE_MOST_S_MANTISSA - 1 : 0] unrounded_mantissa, input [SIZE_LEAST_S_MANTISSA- 1 : 0] dummy_bits, output[SIZE_MOST_S_MANTISSA - 1 : 0] rounded_mantissa); wire g, sticky, round_dec; assign g = dummy_bits[SIZE_LEAST_S_MANTISSA - 1]; assign sticky = |(dummy_bits[SIZE_LEAST_S_MANTISSA - 2 : 0]); assign round_dec = g & (unrounded_mantissa[0] | sticky); assign rounded_mantissa = unrounded_mantissa + round_dec; endmodule
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