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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_interp(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-1)*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;
wire [bw-1:0] signal_in;
output [bw-1:0] signal_out;
wire [bw-1:0] signal_out;
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];
integer i;
sign_extend #(bw,bw+maxbitgain)
ext_input (.in(signal_in),.out(signal_in_ext));
wire clear_me = reset | ~enable;
//FIXME Note that this section has pipe and diff reversed
// It still works, but is confusing
always @(posedge clock)
if(clear_me)
for(i=0;i<N;i=i+1)
integrator[i] <= #1 0;
else if (enable & strobe_out)
begin
if(strobe_in)
integrator[0] <= #1 integrator[0] + pipeline[N-1];
for(i=1;i<N;i=i+1)
integrator[i] <= #1 integrator[i] + integrator[i-1];
end
always @(posedge clock)
if(clear_me)
begin
for(i=0;i<N;i=i+1)
begin
differentiator[i] <= #1 0;
pipeline[i] <= #1 0;
end
end
else if (enable && strobe_in)
begin
differentiator[0] <= #1 signal_in_ext;
pipeline[0] <= #1 signal_in_ext - 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
wire [bw+maxbitgain-1:0] signal_out_unnorm = integrator[N-1];
cic_int_shifter #(bw)
cic_int_shifter(rate,signal_out_unnorm,signal_out);
endmodule // cic_interp
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