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- What is metastability? - Electrical Engineering Stack Exchange
A metastable state is similar to an unstable equilibrium A common example of an unstable equilibrium is an inverted pendulum If you can balance the pendulum in a vertical position, that is a stable state However, if anything pushes the lever to either side (air currents or ground vibrations, for example), the pendulum will not restore itself to the vertical position, it will fall down
- Why do cascading D-Flip Flops prevent metastability?
They don't prevent metastability from affecting the output, but they can greatly increase the mean time between incidents since the metastability would have to be of relatively long duration Cascading three (or more) well-designed flip-flops can increase the time between incidents to something like the age of the earth
- How does the second flip-flop in a naive synchronizer prevent a . . .
1 In this very nice answer it's explained that, fundamentally, a two flip-flop synchronizer's basic operation is to prevent the propagation of a metastable state (effectively, an invalid logic level) from propagating down a system I still don't totally follow how this actually works though Suppose the worst happens and FF1 enters a metastable
- How does 2-ff synchronizer ensure proper synchonization?
The second FF as the diagram shows catches the metastable first FF output and prevents it propagating further through the design There are various sorts of signals, and how you include synchronisers depends on what signal you are talking about
- Metastable state when S = R = 1 in SR Latch?
According to wikibooks, under the section SR Latch, S = R = 1 is a metastable state The following things are mentioned under the heading When both inputs are high at once, however, there is a pr
- How do I model a simple metastable flip-flop in ngspice?
Problem I'm trying to simulate the simplest possible model for a flip-flop: two inverters connected in a circle I'm using ngspice 31 on Arch Linux I based my model on the CMOS SOI Inverter examp
- After metastability, does the value eventually settle to the correct . . .
Now -- in practice, the output will settle to a value; because the metastable flop-flop is a high gain circuit starting from an unstable equilibrium point, the settling is achieved exponentially -- as the signal deviates from the balance point, it changes faster and faster
- If a flip flop has a setup violation and goes metastable, is it . . .
Here is a scope trace showing the output of a flip-flop going through a metastable state, with the exit from the metastable state taking a random amount of time: Picture taken from W J Dally, 11 9 2005
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