External bus interface

Ok, I've kept the address, write, read, and chipselect lines with the former 3 as shared. However, when I try to add bidirectional ports, the check mark in the shared box can't be unselected when define as data. The signals that I need to have come out externally don't get generated when either data or export is selcted as type. The way around this is to split each bidirectional port to have its own input and output ports, so it seems. It doesn't matter if the User Logic is set as Register or Memory slave.