Priority encoder behavior — what appears at the outputs when multiple inputs may be active? Choose the best description of the output code for a priority encoder.

Introduction / Context:
Encoders compress multiple input lines into a smaller set of output lines. Priority encoders add arbitration: when more than one input is active, they choose the one with the highest priority and report its index as a binary code.

Given Data / Assumptions:

• Multiple inputs may assert simultaneously.
• A static priority is predefined (e.g., input 7 over input 6, etc.).
• Only one encoded value is presented at a time.

Concept / Approach:
The function of a priority encoder is to output the binary number that identifies the highest-priority active input. Some devices also assert a “valid” output to indicate that at least one input is active, and may provide enable outputs for cascading.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

Common Pitfalls:

Final Answer: