3 // USRP - Universal Software Radio Peripheral
5 // Copyright (C) 2003 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
23 // Sign extension "macro"
24 // bits_out should be greater than bits_in
26 module sign_extend (in,out);
27 parameter bits_in=0; // FIXME Quartus insists on a default
30 input [bits_in-1:0] in;
31 output [bits_out-1:0] out;
33 assign out = {{(bits_out-bits_in){in[bits_in-1]}},in};