Triggering terminology — recognizing edge activation In digital logic, if an input action occurs specifically on a signal transition (rising or falling), that input is said to be ________.

Introduction / Context:
Precise terminology matters when describing how a circuit responds to its control signals. When the response occurs only at the instant a control signal changes state (rather than while it is held at a level), we use the term edge-triggered. This distinction is key for timing analysis and for writing accurate specifications and HDL models.

Given Data / Assumptions:

• The action is tied to a transition, not a sustained level.
• Both rising-edge and falling-edge cases qualify as edge-triggered.
• We are discussing general terminology independent of device family.

Concept / Approach:
Edge-triggering restricts sensitivity to a narrow time window around the signal edge. This minimizes the risk of unintended state changes caused by signal variations during the remainder of the cycle and enables stable synchronous design with defined setup/hold windows.

Step-by-Step Solution:

Verification / Alternative check:
Consult typical datasheets: trigger types are specified as rising-edge, falling-edge, or level-sensitive; “edge-triggered” is the umbrella term for the first two.

Why Other Options Are Wrong:

• Toggle triggered: informal; typically refers to JK FF behavior when J=K=1, not a general trigger type.
• Clock triggered: ambiguous; many devices use a clock but can be level-sensitive.
• Noise triggered: undesirable behavior, not a design goal or term of art.

Common Pitfalls:
Confusing level-sensitive latches with edge-triggered flip-flops; they have very different timing implications.

Final Answer:
edge-triggered