Mean Time Between Failures Parameters
Mean Time Between Failures (MTBF) for a synchronizer decreases as the asynchronous data transition frequency increases. An analysis circuit evaluates metastability risk by asserting a flag HIGH for one full clock period immediately following any rising edge of CLK where an asynchronous input transitions state.
Five signals are shown: CLK (clock, period 2), ASYNC_A (high-density asynchronous input), ASYNC_B (low-density asynchronous input), M_FLAG_A (risk flag for A, initially 0), and M_FLAG_B (risk flag for B, initially 0).
Trace M_FLAG_A and M_FLAG_B across all 14 time steps to identify which signal stream exhibits more collision events.
Constraints
- A transition is defined as the input value at the current time step being different from the input value at the immediately preceding time step.
- The risk flag captures the collision event exactly at the rising edge and holds the HIGH state until the next rising edge.
- If no transition occurs exactly on the rising edge, the flag is driven LOW for that clock period.
Topics
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