3 // USRP - Universal Software Radio Peripheral
5 // Copyright (C) 2008 Matt Ettus
7 // This program is free software; you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License as published by
9 // the Free Software Foundation; either version 2 of the License, or
10 // (at your option) any later version.
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301 USA
22 // Clipping "macro", keeps the bottom bits
25 #(parameter bits_in=0,
27 (input [bits_in-1:0] in,
28 output [bits_out-1:0] out);
30 wire overflow = |in[bits_in-1:bits_out-1] & ~(&in[bits_in-1:bits_out-1]);
31 assign out = overflow ?
32 (in[bits_in-1] ? {1'b1,{(bits_out-1){1'b0}}} : {1'b0,{(bits_out-1){1'b1}}}) :