Independent keys of the input four output four separate LED and a buzzer. Key is pressed, the corresponding LED variable, while the buzzer sounds, release the button, the corresponding LED off, does not sound buzzer. Buzzer function is to complete the four-input AND gate. This quad is very important, very good scalability of the entire circuit.

led_key_beep.bsf
led_key_beep.vhd
led_key_beep.vhd.bak

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