let's consider a certain finite state machine, for instance a Mealy Machine:
I was told that it cannot work properly in absence of a reset signal (for the State Register), since we would not know the initial state of the device at the moment in which it is switched on.
But I do not understand clearly this concept. In fact, a Mealy machine may be described by an ASM diagram, for instance this one:
Let's consider the instant in which it is switched on: why cannot it work properly without a reset button?
If it is not present, I think that the machine will follow anyway the related ASM diagram correctly, and the difference is simply that it may start from another state (for instance from s1 instead of s0).