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Diffstat (limited to 'gr-sounder/src/fpga/lib/strobe.v')
| -rw-r--r-- | gr-sounder/src/fpga/lib/strobe.v | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/gr-sounder/src/fpga/lib/strobe.v b/gr-sounder/src/fpga/lib/strobe.v new file mode 100644 index 0000000000..ed07f21f46 --- /dev/null +++ b/gr-sounder/src/fpga/lib/strobe.v @@ -0,0 +1,48 @@ +// -*- verilog -*- +// +// USRP - Universal Software Radio Peripheral +// +// Copyright (C) 2007 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 +// + +module strobe(clk_i,rst_i,ena_i,rate_i,strobe_i,strobe_o,count_o); + parameter width = 16; + + input clk_i; + input rst_i; + input ena_i; + input [width-1:0] rate_i; // Desired period minus one + input strobe_i; + output strobe_o; + output [width-1:0] count_o; + + + reg [width-1:0] counter; + + always @(posedge clk_i) + if(rst_i | ~ena_i) + counter <= 32'hFFFFFFFF; // First period is short by one + else if(strobe_i) + if(counter == rate_i) + counter <= 0; + else + counter <= counter + 1; + + assign strobe_o = (counter == rate_i) & strobe_i; + assign count_o = counter; + +endmodule // strobe |