What is the purpose of register test with a pattern "10101010"?

What is the purpose of register test with such a pattern “10101010”?
Is there any reason in perspective of layout?

In reply to UVM_LOVE:

The “10101010” setting is a common test setting used in digital system testing. It has many different functions and purposes, e.g.

Toggle Test:

The “10101010” setting swaps 0s and 1s, giving a good toggle rate. Toggle testing is necessary to ensure that the flip-flop and registers can be properly switched between states.
This helps identify issues related to signal switching, such as potential errors, violations of saving time, and other timing issues.
Detection of stuck-at errors:

Stuck-at faults occur when the signal is always stuck at 0 or 1. the alternating pattern helps detect such faults because it tests two logic states in an iterative manner
Power management test:

Alternating models helps to analyze the characteristics of power consumption. It uses both 0 and 1 rational states, allowing the designer to analyze power consumption under various circumstances.
Clock Domain Crossover (CDC) Test:

On systems with multiple clock zones, the “10101010” setting can be used to test and verify proper operation as the clock zone intersects.
Iddq Test: .

The Iddq test is a measurement of the quiescent current of a digital circuit under steady state conditions. The example “10101010” can be useful in this case because it allows the circuit to enter into a steady state.
Functional testing:

In some cases, this model may be part of a functional test. For example, this procedure on the data bus can be used to verify the transmitted and received data.
Regarding the design approach, the choice of this model may not be explicitly related to design considerations but rather to the specific test objectives discussed above but in some cases may be facilitated by flexibility 0 and 1 using regular settings.

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