Bidirectional Ports

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Port Name	Required	Description	Comments
bidirin	Yes	Bidirectional port.	Must connect to the `padio` port of the altddio_bidir megafunction. The `padio` port must not have any other fanouts.
io	Yes	Bidirectional port.	Must connect to the bidirectional device pin or an entity bidirectional port. There must be no logic between the `io` port and the device's bidirectional port.