Entity io_KeyPadScanner

Block Diagram of io_KeyPadScanner

This module drives a one-hot encoded column vector to read back a rows vector. By scanning column-by-column it's possible to extract the current button state of the whole keypad. The scanner uses high-active logic. The keypad size and scan frequency can be configured. The outputed signal matrix is not debounced.

Generics

Name	Type	Default	Description
CLOCK_FREQ	FREQ	100 MHz
SCAN_FREQ	FREQ	1 kHz
ROWS	positive	4
COLUMNS	positive	4
ADD_INPUT_SYNCHRONIZERS	boolean	TRUE

Ports

Name	Type	Direction	Description
Clock	std_logic	in
Reset	std_logic	in
KeyPadMatrix	T_SLM	out	Matrix interface
ColumnVector	std_logic_vector	out	KeyPad interface
RowVector	std_logic_vector	in

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