// Copyright 2007 Altera Corporation. All rights reserved. // Altera products are protected under numerous U.S. and foreign patents, // maskwork rights, copyrights and other intellectual property laws. // // This reference design file, and your use thereof, is subject to and governed // by the terms and conditions of the applicable Altera Reference Design // License Agreement (either as signed by you or found at www.altera.com). By // using this reference design file, you indicate your acceptance of such terms // and conditions between you and Altera Corporation. In the event that you do // not agree with such terms and conditions, you may not use the reference // design file and please promptly destroy any copies you have made. // // This reference design file is being provided on an "as-is" basis and as an // accommodation and therefore all warranties, representations or guarantees of // any kind (whether express, implied or statutory) including, without // limitation, warranties of merchantability, non-infringement, or fitness for // a particular purpose, are specifically disclaimed. By making this reference // design file available, Altera expressly does not recommend, suggest or // require that this reference design file be used in combination with any // other product not provided by Altera. ///////////////////////////////////////////////////////////////////////////// module float_to_fixed ( float_in, fixed_sign, fixed_mag ); parameter FIXED_WIDTH = 8; // must not be > 32 parameter FIXED_FRACTIONAL = 4; input [31:0] float_in; output fixed_sign; output [FIXED_WIDTH-1:0] fixed_mag; wire [7:0] float_exp; wire [22:0] float_mantissa; assign {fixed_sign, float_exp, float_mantissa} = float_in; wire [31:0] working_out = {1'b1,float_mantissa,8'h0}; wire [7:0] shift_dist = 8'd127 + (FIXED_WIDTH-FIXED_FRACTIONAL) - 1 - float_exp; wire [4:0] trunc_shift_dist = (|shift_dist[7:5]) ? 5'b11111 : shift_dist[4:0]; wire [31:0] shifted_out = working_out >> trunc_shift_dist; assign fixed_mag = shifted_out[31:32-FIXED_WIDTH]; endmodule