Parameterized tri-state buffer megafunction. Altera recommends using TRI primitives rather than lpm_bustri for easier implementation and to improve compilation time. However, the lpm_bustri function may be useful for controlling both unidirectional and bidirectional I/O bus controllers. The lpm_bustri megafunction is available for all Altera devices.
Altera recommends instantiating this function with the IP Catalog.