debouncer

Debouncer

A module used to filter the vibration of mechanical button contacts. After changing the state of the input NoisySignal_i, the module waits the time specified by the parameter . If the input state is stable during this time, then the output state FilteredSignal_o changes.

Instantiation

	Debouncer #(
		.CLOCK_HZ(CLOCK_HZ),
		.PERIOD_US()
	) Debouncer_inst(
		.Clock(Clock),
		.Reset(Reset),
		.NoisySignal_i(),
		.FilteredSignal_o(),
		.RisingEdge_o(),
		.FallingEdge_o()
	);

Port description

• CLOCK_HZ - Clock signal frequency [Hz].
• PERIOD_US - Period of strobe signals [us].
• Clock - Clock signal, active rising edge.
• Reset - Asynchronous reset, active low.
• NoisySignal_i - Not filtered signal directly from a button or other mechanical switch.
• FilteredSignal_o - Filtered signal without glitches.
• RisingEdge_o - A high state means that a rising edge has been detected in the signal under test.
• FallingEdge_o - A high state means that a falling edge has been detected in the signal under test.

Simulation

Console output

VCD info: dumpfile debouncer.vcd opened for output.
===== START =====
CLOCK_HZ  =  10000000
PERIOD_US =        10
DELAY     =        99
WIDTH     =         7
====== END ======
debouncer_tb.v:53: $finish called at 210200 (1ns)