This 6-bit control field specifies the MBIST function. Table 3.3 shows how the five LSB bits of the Control field affect the behavior of the MBIST controller.
Test runs to completion. If MBIR is 0, sticky fail present after first failure.
|bx00001||Stop-on-fail||End of test on failure.|
|bx00011||Bitmap mode||Enables logging of each failure. See Bitmap mode.|
MBIR selects a nonsticky or sticky fail flag, MBISTRESULT:
When MBIR is set, the fail bit toggles in real time. It goes HIGH for failing comparisons and LOW for passing comparisons.
Setting MBIR can cause the fail bit to toggle at the test frequency. ARM recommends that you do not set MBIR, when the external pin or the ATE cannot follow the test frequency.
When MBIR is cleared, the fail bit is sticky. It remains HIGH after the first failure until a new MBIST instruction shifts in or until the data log shifts out.