MAP electronics Cocerto-B Spezifikationen PDF herunterladen (Seite 32)

Usage Notes and Known Design Exceptions to Functional Specifications

www.ti.com

Advisory Master Subsystem Boot ROM: NMI Handler Can Return Before Clearing All the

Pending NMIs, if There is a Nested NMI

Revision(s) Affected 0

Details The Master Subsystem Boot ROM depends on the MNMIFLG.NMIINT bit to determine if

there is a pending NMI on the Master Subsystem. However, as mentioned in the

advisory titled "Master Subsystem: MNMIFLG.NMIINT Bit Will Not be Set in Some Cases

When an NMI is Still Pending", this bit might not be set. Therefore, the Master Boot

ROM NMI handler might return while there is an active NMI pending and MNMIWD

counter running. This will trigger MNMIWDRST and reset the entire device. The

probability of nested NMI happening during boot time is highly unlikely, unless there is a

critical issue elsewhere in the device.

Workaround(s) None. This is fixed in Revision A silicon.

Advisory Master Boot ROM: NMI Handler Not Executed if NMI Occurs at Power Up or

Immediately After a Reset

Revision(s) Affected 0

Details If there is an NMI at power up or immediately after a reset, the master Boot ROM will

branch to the NMI handler. Since access to all memories is blocked upon reset, the NMI

handler will not be able to acknowledge the NMI, which will cause the MNMIWD counter

to eventually overflow and reset the device. If this NMI is a missing clock NMI, there will

be another NMI after the MNMIWD reset because the MCLKSTS bit is not cleared by an

external (or watchdog) reset. Therefore, if there is a missing clock condition upon power

up or immediately after an external reset, then the device will keep resetting over and

over again.

Workaround(s) None. This is fixed in Revision A silicon.

Advisory Master Boot ROM: Parallel Boot Mode Will Not Work as Intended

Revision(s) Affected 0

Details Parallel boot mode does not transfer data into the device in the intended format.

Workaround(s) Use ARM production programming solutions for Cortex-M3 programming.

This is fixed in Revision A silicon.

F28M35x Concerto™ MCU Silicon Errata SPRZ357J–August 2011–Revised July 2014

Submit Documentation Feedback

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 38 39

Keine Kommentare

MAP electronics Cocerto-B Spezifikationen Seite 32