AN 737: SEU Detection and Recovery in Intel® Arria® 10 Devices

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ID 683064
Date 10/21/2021
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2.3.5. Architectural Vulnerability Factor

The Single Event Functional Interrupt (SEFI) ratio measures bit errors due to SEU strikes versus functional interrupts. Minimizing this ratio improves SEU mitigation.

10% SEFI factors are A typical specification to deflate the raw FIT to that observed in practice. For reference, the last two columns in the Projected SEU FIT by Component Usage report show AVF deflations for a conservative SEFI of 50% and a moderate SEFI of 25%.

SEFI represents a combination of factors. A utilization + ECC factor of 40% and AVF of 25% thus represents a global SEFI factor of 10%, because 0.4 × 0.25 = 0.1. An end-to-end SEFI factor of 10% is typical for a full design.

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