diff options
Diffstat (limited to 'usrp2/sdr_lib/clip.v')
| -rw-r--r-- | usrp2/sdr_lib/clip.v | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/usrp2/sdr_lib/clip.v b/usrp2/sdr_lib/clip.v new file mode 100644 index 000000000..3e6b3a2e2 --- /dev/null +++ b/usrp2/sdr_lib/clip.v @@ -0,0 +1,36 @@ +// -*- verilog -*- +// +// USRP - Universal Software Radio Peripheral +// +// Copyright (C) 2008 Matt Ettus +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301 USA +// + +// Clipping "macro", keeps the bottom bits + +module clip + #(parameter bits_in=0, + parameter bits_out=0) + (input [bits_in-1:0] in, + output [bits_out-1:0] out); + + wire overflow = |in[bits_in-1:bits_out-1] & ~(&in[bits_in-1:bits_out-1]); + assign out = overflow ? + (in[bits_in-1] ? {1'b1,{(bits_out-1){1'b0}}} : {1'b0,{(bits_out-1){1'b1}}}) : + in[bits_out-1:0]; + +endmodule // clip + |