Physics A-Level
Up/down input
What Up/down input means in Physics A-Level, as defined for AQA.
Definition of Up/down input
Check what you remember
Read the wording for your board, then hide it and explain Up/down input in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Selects the direction of counting: at one logic level the counter increments, and at the other level it decrements.
Topics that use Up/down input
- Sequential logic (A-level only) (AQA A-Level)
Related terms
- Asynchronous output changes
- Boolean expression
- Clock
- Clock-edge triggering
- Johnson counter
- Reset input
- Sequential logic circuits
- Timing diagram
Using Up/down input in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
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