Look-Ahead Clock Gating for Event-Driven TOF Sensor Pipelines

The patent implements a look-ahead clock gating technique that anticipates TOF events early in the digital data pipeline by detecting events in early stages (such as SPAD detection or histogram binning) before they propagate through the entire processing chain. This preliminary detection allows the system to proactively activate clock signals to downstream components only when needed, rather than using conventional continuous or simple gated clocking that lacks event awareness. The look-ahead mechanism enables power optimization by synchronizing clock activation with actual event occurrence, avoiding unnecessary power consumption in idle processing stages.

The patent introduces an intermediary look-ahead detection mechanism that sits between the random SPAD event generation and the clock gating control. This intermediary layer monitors early pipeline stages for event presence and uses this information to dynamically control clock signal distribution to downstream components. The intermediary detector acts as a mediator that translates random SPAD events into coordinated clock activation patterns, ensuring that all necessary components are responsive to events while maintaining low complexity through selective rather than universal clocking.

The patent implements preliminary event detection in early pipeline stages that triggers clock activation in downstream stages before actual processing is needed. This look-ahead approach eliminates processing delays by ensuring that when events arrive at later stages, the clock signals are already active and components are ready to process immediately. The system achieves this by detecting events upstream and proactively preparing downstream components, thus maintaining responsiveness while enabling power savings through selective rather than continuous clocking.