Verilog isn’t magic, it’s scheduling!

Every simulation step in Verilog is guided by an invisible traffic controller: the Event Scheduler.
It decides what runs, when it runs, and how signals update.

Here’s the flow that makes digital design behave the way we expect:

Active Region → Executes blocking assignments, $display,$write and evaluates RHS of non-blocking assignments.
Inactive Region → Handles zero-delay #0 operations (careful: race conditions live here!).
NBA Region → Safely updates all non-blocking assignments, enabling race-free register transfers.
Postponed Region → for $monitor, $strobe

► Without this scheduling system, our designs would collapse into chaos-race conditions everywhere!

I recently shared a PPT deep-dive on this topic analysis to help bridge the gap between learning and practical debugging.

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