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Diffstat (limited to 'fpga/usrp2/sdr_lib/cic_strober.v')
-rw-r--r-- | fpga/usrp2/sdr_lib/cic_strober.v | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/fpga/usrp2/sdr_lib/cic_strober.v b/fpga/usrp2/sdr_lib/cic_strober.v new file mode 100644 index 000000000..40d76bdd9 --- /dev/null +++ b/fpga/usrp2/sdr_lib/cic_strober.v @@ -0,0 +1,45 @@ +// +// USRP2 - Universal Software Radio Peripheral Mk II +// +// Copyright (C) 2008 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_strober + #(parameter WIDTH=8) + ( input clock, + input reset, + input enable, + input [WIDTH-1:0] rate, // Rate should EQUAL to your desired divide ratio, no more -1 BS + input strobe_fast, + output wire strobe_slow ); + + reg [WIDTH-1:0] counter; + wire now = (counter==1); + assign strobe_slow = now && enable && strobe_fast; + + always @(posedge clock) + if(reset) + counter <= 0; + else if (~enable) + counter <= rate; + else if(strobe_fast) + if(now) + counter <= rate; + else + counter <= counter - 1; + +endmodule // cic_strober |