In XACT6, IOBUFE was included in the 9k XNF macro library that was used for all design flows. In M1, IOBUFE exists only in the XSI expansion library. Exemplar designs containing bidi-I/Os fail with the ngdbuild warning "Logical block... of type IOBUFE not expanded" followed by Hitop warning xr5055.
解决方案
Change the extension of the output file in the Exemplar menu to ".sedif" (or ".sxnf") to allow ngdbuild to use the XSI library which expands the IOBUFEs.