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Diffstat (limited to 'fpga/usrp2/sdr_lib/round.v')
-rw-r--r-- | fpga/usrp2/sdr_lib/round.v | 59 |
1 files changed, 0 insertions, 59 deletions
diff --git a/fpga/usrp2/sdr_lib/round.v b/fpga/usrp2/sdr_lib/round.v deleted file mode 100644 index 26d5a4cf4..000000000 --- a/fpga/usrp2/sdr_lib/round.v +++ /dev/null @@ -1,59 +0,0 @@ -// -*- verilog -*- -// -// USRP - Universal Software Radio Peripheral -// -// Copyright (C) 2011 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 -// - -// Rounding "macro" -// Keeps the topmost bits, does proper 2s comp round to zero (unbiased truncation) - -module round - #(parameter bits_in=0, - parameter bits_out=0, - parameter round_to_zero=0, // original behavior - parameter round_to_nearest=1, // lowest noise - parameter trunc=0) // round to negative infinity - (input [bits_in-1:0] in, - output [bits_out-1:0] out, - output [bits_in-bits_out:0] err); - - wire round_corr,round_corr_trunc,round_corr_rtz,round_corr_nearest,round_corr_nearest_safe; - - assign round_corr_trunc = 0; - assign round_corr_rtz = (in[bits_in-1] & |in[bits_in-bits_out-1:0]); - assign round_corr_nearest = in[bits_in-bits_out-1]; - - generate - if(bits_in-bits_out > 1) - assign round_corr_nearest_safe = (~in[bits_in-1] & (&in[bits_in-2:bits_out])) ? 0 : - round_corr_nearest; - else - assign round_corr_nearest_safe = round_corr_nearest; - endgenerate - - - assign round_corr = round_to_nearest ? round_corr_nearest_safe : - trunc ? round_corr_trunc : - round_to_zero ? round_corr_rtz : - 0; // default to trunc - - assign out = in[bits_in-1:bits_in-bits_out] + round_corr; - - assign err = in - {out,{(bits_in-bits_out){1'b0}}}; - -endmodule // round |