Both FPGAs share the same overall routing structure.
Montage has two different functional units.
The D-latch in Montage has a choice of two clocks to allow synchronous interfaces to be mapped, as well as a mode for initializing asynchronous stateholding functions. There is also a feedback line for implementing asynchronous stateholding functions. Primary References G. Borriello, C. Ebeling, S. Hauck, S. Burns. S. Hauck, S. Burns, G. Borriello, C. Ebeling. 11, No. 3, Fall, 1994.