AT-SPEED BUILT-IN SELF TESTING OF MULTI-PORT COMPACT SRAMS

摘要

A built-in self test (BIST) for a multi-port compact sRAM (CsRAM) uses a BIS T controller which operates at the speed of the system, while the CsRAM is tested at the memory speed. The circuitry for testing allows multiple random accesses of the CsRAM per system clock cycle. In this way, timing-related defects in the CsRAM can be detected. The CsRAM is virtually partitioned int o "k" sections, the sections being tested simultaneously from different ports with identical and complementary test data. A conventional (BIST) controller can be used with minimal addition of hardware in a collar arranged around th e memory array.