Question
Download Solution PDFIn a priority encoder, what happens when two or more input lines are active at the same time?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is: The encoder will output the binary code for the highest priority active input.
Explanation:
A priority encoder is a combinational circuit that:
-
Accepts multiple input lines, but only one output is generated at a time.
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If two or more inputs are active simultaneously, the input with the highest priority (usually the one with the highest input number) is encoded and reflected at the output.
This ensures unambiguous output even when multiple inputs are high.
🔍 Example:
For a 4-to-2 priority encoder with inputs D3 to D0 (D3 has highest priority):
| Inputs (D3–D0) | Output (Y1 Y0) |
|---|---|
| 1000 | 11 |
| 0100 | 10 |
| 1100 | 11 (D3 has higher priority) |
| 0011 | 01 (D1 over D0) |
Last updated on Jun 7, 2025
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