Entity pmod_KYPD

Block Diagram of pmod_KYPD

This module drives a 4-bit one-cold encoded column vector to read back a 4-bit rows vector. By scanning column-by-column it's possible to extract the current button state of the whole keypad. This wrapper converts the high-active signals from PoC.io.KeypadScanner to low-active signals for the pmod. An additional debounce circuit filters the button signals. The scan frequency and bounce time can be configured.

Generics

Name	Type	Default	Description
CLOCK_FREQ	FREQ	100 MHz
SCAN_FREQ	FREQ	1 kHz
BOUNCE_TIME	time	10 ms

Ports

Name	Type	Direction	Description
Clock	std_logic	in
Reset	std_logic	in
Keys	T_PMOD_KYPD_KEYPAD	out	Matrix interface
Columns_n	std_logic_vector	out	KeyPad interface
Rows_n	std_logic_vector	in

×