Entity io_Debounce

Block Diagram of io_Debounce

This module debounces several input pins preventing input changes following a previous one within the configured BOUNCE_TIME to pass. Internally, the forwarded state is locked for, at least, this BOUNCE_TIME. As the backing timer is restarted on every input fluctuation, the next passing input update must have seen a stabilized input.

The parameter COMMON_LOCK uses a single internal timer for all processed inputs. Thus, all inputs must stabilize before any one may pass changed. This option is usually fully acceptable for user inputs such as push buttons.

The parameter ADD_INPUT_SYNCHRONIZERS triggers the optional instantiation of a two-FF input synchronizer on each input bit.

Generics

Name	Type	Default	Description
CLOCK_FREQ	FREQ
BOUNCE_TIME	time
BITS	positive	1
INIT	std_logic_vector	x"00000000"	initial state of Output
ADD_INPUT_SYNCHRONIZERS	boolean	true
COMMON_LOCK	boolean	false

Ports

Name	Type	Direction	Description
Clock	std_logic	in
Reset	std_logic	in
Input	std_logic_vector	in
Output	std_logic_vector	out

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