The circuits of NOR based S-R latch classified as asynchronous sequential circuits, why?(a) Because of inverted outputs(b) Because of triggering functionality(c) Because of cross-coupled connection(d) Because of inverted outputs & triggering functionalityI got this question in final exam.My question is from Flip Flops in portion Flip-Flops of Digital Circuits

The circuits of NOR based S-R latch classified as asynchronous sequent

1.	The circuits of NOR based S-R latch classified as asynchronous sequential circuits, why?(a) Because of inverted outputs(b) Because of triggering functionality(c) Because of cross-coupled connection(d) Because of inverted outputs & triggering functionalityI got this question in final exam.My question is from Flip Flops in portion Flip-Flops of Digital Circuits
Answer» The correct answer is (c) Because of cross-coupled connection For EXPLANATION I would say: The cross-coupled CONNECTIONS from the output of one gate to the input of the other gate constitute a feedback path. For this reason, the circuits of NOR based S-R latch classified as asynchronous sequential circuits. MOREOVER, they are REFERRED to as asynchronous because they function in the ABSENCE of a clock pulse.

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