Forum Discussion
Altera_Forum
Honored Contributor
9 years agoMany development boards include PS2 connectors for keyboards. See the schematics for information on safely hooking a PS2 port to an FPGA. There are multiple references on the internet on the protocol used for PS2 keyboards. Also, these same boards usually include example projects using the PS2 port.
I've never used VHDL attributes for pin assignments. Are these even supported by the Altera tools? I'd recommend that you stick with standard I/O constraints.