What is the meaning of metastability?

metastable. / (ˌmɛtəˈsteɪbəl) physics / adjective. (of a body or system) having a state of apparent equilibrium although capable of changing to a more stable state. (of an atom, molecule, ion, or atomic nucleus) existing in an excited state with a relatively long lifetime.

What is metastability in thermodynamics?

The concept of metastability is intimately linked with the existence of energy barriers in thermodynamics. A metastable state describes a phase in which an energy barrier must be surmounted before that phase can be transformed to one of lower free energy.

What is metastable in biology?

A metastable state is a state of a system which is stable over one time-scale and unstable over another timescale.

What is a metastable material?

Metastable materials, or materials that transform to another state over a long period of time, are ubiquitous in both nature and technology and often have superior properties. Chocolate, for example, is metastable, with a lower melting point and better texture than stable chocolate.

What is metastability and do you know its physical significance?

In chemistry and physics, metastability denotes an intermediate energetic state within a dynamical system other than the system’s state of least energy. A ball resting in a hollow on a slope is a simple example of metastability.

What is metastability in FPGA?

A metastable state is one in which the output of a Flip-Flop inside of your FPGA is unknown, or non-deterministic. When a metastable condition occurs, there is no way to tell if the output of your Flip-Flop is going to be a 1 or a 0. A metastable condition occurs when setup or hold times are violated.

What is the difference between the states of phase equilibrium and metastability?

The distinction between stable and metastable equilibrium is generally that the stable equilibrium state is “truly unchanging”, or unchanging given in- definite time, whereas the metastable state may be changing, but too slowly to be observed (see Quota- tions).

What is metastability in Verilog?

What is metastability How would you prevent it?

The most common way to tolerate metastability is to add one or more successive synchronizing flip-flops to the synchronizer. This approach allows for an entire clock period (except for the setup time of the second flip-flop) for metastable events in the first synchronizing flip-flop to resolve themselves.

How do I get rid of metastability?

Synchronizing Asynchronous Signals Perhaps the most prevalent and widely accepted solution to the metastability problem, is the addition of front-end circuitry to synchronize an incoming asynchronous signal with the clock of the target synchronous circuit.

What is metastability state in Verilog?

What is meant by dynamic equilibrium?

Updated on March 08, 2019. A dynamic equilibrium is a chemical equilibrium between a forward reaction and the reverse reaction where the rate of the reactions are equal. At this point, the ratio between reactants and products remains unchanged over time.

What is metastability in physics?

In physics, metastability is a stable state of a dynamical system other than the system’s state of least energy . A ball resting in a hollow on a slope is a simple example of metastability. If the ball is only slightly pushed, it will settle back into its hollow, but a stronger push may start the ball rolling down the slope.

What are metastable states?

Metastable states are inherent features of asynchronous digital systems, and of systems with more than one independent clock domain. In self-timed asynchronous systems, arbiters are designed to allow the system to proceed only after the metastability has resolved, so the metastability is a normal condition, not an error condition.

What is a transition from metastable excited to metastable?

Transitions from metastable excited levels are typically those forbidden by electric dipole selection rules. This means that any transitions from this level are relatively unlikely to occur. In a sense, an electron that happens to find itself in a metastable configuration is trapped there.

What is the worst case of metastable condition?

In the worst case, depending on timing, the metastable condition at Ds can propagate to Dout and through the following logic into more of the system, causing undefined and inconsistent behavior.