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. Asynchronous Circuits Survey of current asynchronous design methodologies, as well as the first FPGA for asynchronous circuits. 60-69, Fall, 1994. 491-501, December, 1995.