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⟩ How to detect a sequence of "1101" arriving serially from a signal line?

Use 4 D-bascules connected in serial, all synchronized with

the same CLK. Then connect all 4 outputs, & 2nd output must

reverse, of the D-bascule to an AND logic. The output of

the AND logic sould have '1' when it detectes "1101". This

technic oftenly use for glitch detection in the signal.

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