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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 edge_sync
#(parameter POSEDGE = 1)
(input clk,
input rst,
input sig,
output trig);
reg [1:0] delay;
always @(posedge clk)
if(rst)
delay <= 2'b00;
else
delay <= {delay[0],sig};
assign trig = POSEDGE ? (delay==2'b01) : (delay==2'b10);
endmodule // edge_sync
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