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-rwxr-xr-xusrp/fpga/sdr_lib/cic_decim.v93
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diff --git a/usrp/fpga/sdr_lib/cic_decim.v b/usrp/fpga/sdr_lib/cic_decim.v
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--- a/usrp/fpga/sdr_lib/cic_decim.v
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-// -*- verilog -*-
-//
-// USRP - Universal Software Radio Peripheral
-//
-// Copyright (C) 2003 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
-//
-
-
-module cic_decim
- ( clock,reset,enable,rate,strobe_in,strobe_out,signal_in,signal_out);
- parameter bw = 16;
- parameter N = 4;
- parameter log2_of_max_rate = 7;
- parameter maxbitgain = N * log2_of_max_rate;
-
- input clock;
- input reset;
- input enable;
- input [7:0] rate;
- input strobe_in,strobe_out;
- input [bw-1:0] signal_in;
- output [bw-1:0] signal_out;
- reg [bw-1:0] signal_out;
- wire [bw-1:0] signal_out_unreg;
-
- wire [bw+maxbitgain-1:0] signal_in_ext;
- reg [bw+maxbitgain-1:0] integrator [0:N-1];
- reg [bw+maxbitgain-1:0] differentiator [0:N-1];
- reg [bw+maxbitgain-1:0] pipeline [0:N-1];
- reg [bw+maxbitgain-1:0] sampler;
-
- integer i;
-
- sign_extend #(bw,bw+maxbitgain)
- ext_input (.in(signal_in),.out(signal_in_ext));
-
- always @(posedge clock)
- if(reset)
- for(i=0;i<N;i=i+1)
- integrator[i] <= #1 0;
- else if (enable && strobe_in)
- begin
- integrator[0] <= #1 integrator[0] + signal_in_ext;
- for(i=1;i<N;i=i+1)
- integrator[i] <= #1 integrator[i] + integrator[i-1];
- end
-
- always @(posedge clock)
- if(reset)
- begin
- sampler <= #1 0;
- for(i=0;i<N;i=i+1)
- begin
- pipeline[i] <= #1 0;
- differentiator[i] <= #1 0;
- end
- end
- else if (enable && strobe_out)
- begin
- sampler <= #1 integrator[N-1];
- differentiator[0] <= #1 sampler;
- pipeline[0] <= #1 sampler - differentiator[0];
- for(i=1;i<N;i=i+1)
- begin
- differentiator[i] <= #1 pipeline[i-1];
- pipeline[i] <= #1 pipeline[i-1] - differentiator[i];
- end
- end // if (enable && strobe_out)
-
- wire [bw+maxbitgain-1:0] signal_out_unnorm = pipeline[N-1];
-
- cic_dec_shifter #(bw)
- cic_dec_shifter(rate,signal_out_unnorm,signal_out_unreg);
-
- always @(posedge clock)
- signal_out <= #1 signal_out_unreg;
-
-endmodule // cic_decim
-