General Description: What does the following error message mean?
hi811 - Cannot assign Fastclock Pin D2_PAD to Pin 40 (FB1_1). This pin does not support the functionality of that signal.
If you want to use a global buffer for the 9500 family, you need to make sure that you use the appropriate pin. The last few pages of the 9500 data sheet contain a section describing which pins have special functionality (global clock pins, global 3-state pins, global set/reset pins).
This error message appears when you have a global buffer locked to a pin that does not support that feature.
If you must have your clock signal on this pin, remove the global buffer component (BUFG), and the clock will be routed to all flip-flops via standard product term paths.