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Parameterized Tri-State Buffer
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.
Altera also recommends instantiating this function as described in Creating a Custom Megafunction Variation with the MegaWizard Plug-In Manager.
>>> If the result[] output feeds logic, and does not feed a BIDIR pin, >>> the enabletr signal must be tied to VCC or an error message will >>> result.
AHDL Function Prototype (port name and order also apply to Verilog HDL):
FUNCTION lpm_bustri (data[LPM_WIDTH-1..0], enabletr, enabledt)
WITH (LPM_WIDTH)
RETURNS (tridata[LPM_WIDTH-1..0], result[LPM_WIDTH-1..0]);
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