keypad controller implementation(FPGA)

Hi all,

I want to implement a 6x6 keypad decoder in FPGA,i have got a reference
design for that, but the limitation with this reference design is that
it scans for only one key pressed at a time.It dosen't have the
capabality of scanning for multiple keys at the same time.

Can anybody help me out on this , how to go about this( any reference
design)

Thanks in advance,
Praveen

.

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