Counter readout: Evaluate the statement “Counters are generally decoded in order to determine their count state.” Decide whether this describes typical practice for obtaining human- or logic-readable outputs.

Difficulty: Easy

Correct Answer: Correct

Explanation:


Introduction / Context:
Raw counter outputs are often in binary or Gray form and may not directly drive displays or control lines. Decoding maps counter states to meaningful outputs, such as segment drives for digits or enable lines for time-division multiplexing. This question asks whether decoding is a general step in using counters.



Given Data / Assumptions:

  • Counters produce multi-bit outputs representing state.
  • Systems frequently need a specific “one-of-N” line active or a human-readable digit.
  • Decoder ICs (e.g., 74xx138, 74xx154) or programmable logic often implement this mapping.


Concept / Approach:
Decoding means transforming the counter’s encoded state into a set of control or display signals. For example, a 4-bit binary count can be decoded to 10 active-low lines to drive digits 0–9, or to seven-segment patterns using a BCD-to-7-segment decoder. Decoding is not mandatory in every application but is common practice for interpreting the count state.



Step-by-Step Solution:

Identify counter encoding (binary, BCD, Gray).Select a suitable decoder (one-of-N, seven-segment, ROM/PLA) to map states.Generate outputs for displays, timing strobes, or control signals.Observe that most practical designs decode in some form to use the count meaningfully.


Verification / Alternative check:
Standard digital design texts show counters paired with decoders for timing sequences, scanning keyboards, or driving displays.



Why Other Options Are Wrong:
Limiting the statement to synchronous or ripple counters is unnecessary; both commonly use decoding. “Incorrect” ignores widespread usage patterns.



Common Pitfalls:
Overlooking hazards when decoding ripple-counter outputs (glitches) and forgetting to register decoded signals in high-speed contexts.



Final Answer:
Correct

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