2.1.3. Failure detection

The MBISTRESULT[1] flag goes HIGH two CLK cycles after the controller detects a failure, as Figure 2.3 shows. It stays HIGH if sticky fail is enabled. If stop on fail is enabled, the MBISTRESULT[2] flag goes HIGH two cycles later.

Figure 2.3. Detecting an MBIST failure


To ensure that a failure at test speed can be observed by the ATE, specify a sticky fail in the MBIST instruction. See Control field, MBIR[39:34].

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