diff options
Diffstat (limited to 'gr-gpio/src/fpga/lib/integ_shifter.v')
-rw-r--r-- | gr-gpio/src/fpga/lib/integ_shifter.v | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/gr-gpio/src/fpga/lib/integ_shifter.v b/gr-gpio/src/fpga/lib/integ_shifter.v deleted file mode 100644 index 1ad0504cb..000000000 --- a/gr-gpio/src/fpga/lib/integ_shifter.v +++ /dev/null @@ -1,68 +0,0 @@ -// -*- verilog -*- -// -// USRP - Universal Software Radio Peripheral -// -// Copyright (C) 2003 Matt Ettus -// Copyright (C) 2008 Corgan Enterprises LLC -// -// 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 -// - - -// NOTE: This only works for a max decim rate of 256 -// NOTE: Signal "rate" is ONE LESS THAN the actual rate - -module integ_shifter(rate,signal_in,signal_out); - parameter bw = 16; - parameter maxbitgain = 8; - - input [7:0] rate; - input wire [bw+maxbitgain-1:0] signal_in; - output reg [bw-1:0] signal_out; - - reg [3:0] bitgain; - - // Nearest without overflow -- ceil(log2(rate+1)) - always @* - if (rate >= 8'd128) - bitgain = 8; - else if (rate >= 8'd64) - bitgain = 7; - else if (rate >= 8'd32) - bitgain = 6; - else if (rate >= 8'd16) - bitgain = 5; - else if (rate >= 8'd8) - bitgain = 4; - else if (rate >= 8'd4) - bitgain = 3; - else if (rate >= 8'd2) - bitgain = 2; - else - bitgain = 1; - - always @* - case(bitgain) - 5'd1 : signal_out = signal_in[1+bw-1:1]; - 5'd2 : signal_out = signal_in[2+bw-1:2]; - 5'd3 : signal_out = signal_in[3+bw-1:3]; - 5'd4 : signal_out = signal_in[4+bw-1:4]; - 5'd5 : signal_out = signal_in[5+bw-1:5]; - 5'd6 : signal_out = signal_in[6+bw-1:6]; - 5'd7 : signal_out = signal_in[7+bw-1:7]; - default : signal_out = signal_in[8+bw-1:8]; - endcase // case(shift) - -endmodule // integ_shifter |