[103] CCM: Reset value of CCM.MAXPACKETSIZE causes encryption, decryption, and MIC failures

This anomaly applies to IC Rev. Engineering A, build codes QIAA-AA0.

Symptoms

Failing encryption, decryption, and MIC on extended length packets.

Conditions

Always for extended length packets.

Consequences

Failing encryption, decryption, and MIC on extended length packets.

Workaround

Set CCM.MAXPACKETSIZE to 0xFB.

This workaround has already been added into the system_nrf52840.c file present in MDK 8.11.1 or later.

Parent topic: New and inherited anomalies