在两个输入引脚上检测两个同步信号的最佳实践

I need to do the following: I have 2 input pins on a microcontroller, and it is possible, that a signal is received on one or the other, but it is also possible that the two will be physically connected on the outside, and the signal arrives on both at the same time.I need to do the following: I have 2 input pins