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Alteral DE2 board- how to program for buzzer/alarm sound

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Hi, i wish to design a VHDL code to trigger an alarm/buzzer sound provided on Alteral DE2 board. However, i do not how to trigger it from my program. It is not written on the manual.
Can someone shows me the way or provide me some reference? Thanks a lot.

P/s: i want a buzzer sound from DE2 board when a critical condition has been lasted for a few minutes(use counter and clock).
 

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