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diff --git a/fpga/usrp2/sdr_lib/halfband_ideal.v b/fpga/usrp2/sdr_lib/halfband_ideal.v
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--- a/fpga/usrp2/sdr_lib/halfband_ideal.v
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-//
-// Copyright 2011 Ettus Research 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 3 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, see <http://www.gnu.org/licenses/>.
-//
-
-module halfband_ideal (
- input clock,
- input reset,
- input enable,
- input strobe_in,
- input wire signed [17:0] data_in,
- output reg strobe_out,
- output reg signed [17:0] data_out
-) ;
-
- parameter decim = 1 ;
- parameter rate = 2 ;
-
- reg signed [40:0] temp ;
- reg signed [17:0] delay[30:0] ;
- reg signed [17:0] coeffs[30:0] ;
- reg [7:0] count ;
- integer i ;
-
- initial begin
- for( i = 0 ; i < 31 ; i = i + 1 ) begin
- coeffs[i] = 18'd0 ;
- end
- coeffs[0] = -1390 ;
- coeffs[2] = 1604 ;
- coeffs[4] = -1896 ;
- coeffs[6] = 2317 ;
- coeffs[8] = -2979 ;
- coeffs[10] = 4172 ;
- coeffs[12] = -6953 ;
- coeffs[14] = 20860 ;
- coeffs[15] = 32768 ;
- coeffs[16] = 20860 ;
- coeffs[18] = -6953 ;
- coeffs[20] = 4172 ;
- coeffs[22] = -2979 ;
- coeffs[24] = 2317 ;
- coeffs[26] = -1896 ;
- coeffs[28] = 1604 ;
- coeffs[30] = -1390 ;
- end
-
- always @(posedge clock) begin
- if( reset ) begin
- count <= 0 ;
- for( i = 0 ; i < 31 ; i = i + 1 ) begin
- delay[i] <= 18'd0 ;
- end
- temp <= 41'd0 ;
- data_out <= 18'd0 ;
- strobe_out <= 1'b0 ;
- end else if( enable ) begin
-
- if( (decim && (count == rate-1)) || !decim )
- strobe_out <= strobe_in ;
- else
- strobe_out <= 1'b0 ;
-
-
- if( strobe_in ) begin
- // Increment decimation count
- count <= count + 1 ;
-
- // Shift the input
- for( i = 30 ; i > 0 ; i = i - 1 ) begin
- delay[i] = delay[i-1] ;
- end
- delay[0] = data_in ;
-
- // clear the temp reg
- temp = 18'd0 ;
- if( (decim && (count == rate-1)) || !decim ) begin
- count <= 0 ;
- for( i = 0 ; i < 31 ; i = i + 1 ) begin
- // Multiply Accumulate
- temp = temp + delay[i]*coeffs[i] ;
- end
- // Assign data output
- data_out <= temp >>> 15 ;
- end
- end
- end
- end
-endmodule