See Also

Cuts off the delay that is fed back from a bidirectional pin during timing analysis. You can use a bidirectional pin as both an input pin and output pin. When you turn on Cut off feedback from I/O pins, the timing analysis does not include signal feedback from within the device, thus eliminating invalid paths.

Cut off feedback from I/O pins is especially useful when you connect a bidirectional pin directly or indirectly to both the input and the output of a latch. This type of feedback path is continuous because clocked logic primitives cannot interrupt the path. As the Timing Analyzer encounters additional, interconnected latch-to-pin loops, the number of hidden paths grows exponentially, for example, when you use latches with bidirectional buses. Cut off feedback from I/O pins allows you to easily eliminate the false paths caused by latch-to-pin loops.