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MCQ Practice Question

A priority encoder has a VALID output in addition to encoded outputs. The VALID signal is useful primarily to indicate that?

AAt least one encoder input is asserted
BAll inputs are necessarily asserted
CThe output code is analog
DThe clock has stopped

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Correct Answer: A. At least one encoder input is asserted

Explanation: Without a valid indication, the encoded output corresponding to no active input can be ambiguous with the code for a legitimate input. VALID indicates that an asserted input exists.

Reference: Standard digital electronics: priority encoder valid output

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