Klokrand

Klokrand is a term used in Dutch-language electronics and computing to denote the moment of a clock signal when it transitions from low to high or from high to low. It corresponds to the English term clock edge. In digital circuits, many components rely on a clock edge as the timing event that samples data or updates state.

There are two main types of clock edges: rising edge (opkomende rand) and falling edge (dalende rand). Edge-triggered devices, such as flip-flops and certain registers, capture inputs and change state on a specific edge, commonly the rising edge, though some designs use the falling edge or both edges in dual-edge configurations.

The concept is central to timing diagrams and hardware description languages. Notation such as posedge clk or negedge clk indicates which edge triggers the element. Designers must consider clock-related factors such as setup and hold times, clock skew, and metastability to ensure reliable operation across the system.

In practice, klokrand defines when changes become valid in sequential logic and can propagate to subsequent stages. Understanding the edge used for triggering helps in aligning data paths, ensuring correct sequencing of operations, and diagnosing timing-related issues in digital designs.

See also: clock edge, rising edge, falling edge, edge-triggered, clock cycle. Etymology: klokrand combines klok (clock) and rand (edge) in Dutch.