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debounce_switch.v

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+module debounce_switch(
+    input clk,
+    input i_switch,
+    output o_switch);
+
+    parameter c_debounce_limit=250000;// 10ms at 25MHz
+
+reg r_state=1'b0;
+reg [17:0] r_count = 0;
+
+    always@(posedge clk)begin
+        if (i_switch != r_state && r_count < c_debounce_limit)
+            r_count <= r_count +1; //counter
+        else if (r_count == c_debounce_limit)begin
+            r_count <=0;
+            r_state <= i_switch;
+        end
+        else
+            r_count<=0;
+    end
+
+assign o_switch=r_state;
+
+endmodule