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NRF52811-QCAA-R Datasheet(PDF) 90 Page - Nordic Semiconductor |
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NRF52811-QCAA-R Datasheet(HTML) 90 Page - Nordic Semiconductor |
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90 / 444 page  Peripherals Property Address offset Description HEADER 0 Packet Header LENGTH 1 Number of bytes in encrypted payload including length of MIC Important: LENGTH will be 0 for empty packets since the MIC is not added to empty packets RFU 2 Reserved Future Use PAYLOAD 3 Encrypted payload MIC 3 + payload length ENCRYPT: 4 bytes encrypted MIC Important: MIC is not added to empty packets Table 27: Data structure for encrypted packet 6.4.8 EasyDMA and ERROR event The CCM implements an EasyDMA mechanism for reading and writing to the RAM. In cases where the CPU and other EasyDMA enabled peripherals are accessing the same RAM block at the same time, a high level of bus collisions may cause too slow operation for correct on the fly encryption. In this case the ERROR event will be generated. The EasyDMA will have finished accessing the RAM when the ENDKSGEN and ENDCRYPT events are generated. If the CNFPTR, SCRATCHPTR, INPTR and the OUTPTR are not pointing to the Data RAM region, an EasyDMA transfer may result in a HardFault or RAM corruption. See Memory on page 16 for more information about the different memory regions. 6.4.9 Registers Base address Peripheral Instance Description Configuration 0x4000F000 CCM CCM AES CCM mode encryption Table 28: Instances Register Offset Description TASKS_KSGEN 0x000 Start generation of key-stream. This operation will stop by itself when completed. TASKS_CRYPT 0x004 Start encryption/decryption. This operation will stop by itself when completed. TASKS_STOP 0x008 Stop encryption/decryption TASKS_RATEOVERRIDE 0x00C Override DATARATE setting in MODE register with the contents of the RATEOVERRIDE register for any ongoing encryption/decryption EVENTS_ENDKSGEN 0x100 Key-stream generation complete EVENTS_ENDCRYPT 0x104 Encrypt/decrypt complete EVENTS_ERROR 0x108 CCM error event Deprecated SHORTS 0x200 Shortcuts between local events and tasks INTENSET 0x304 Enable interrupt INTENCLR 0x308 Disable interrupt MICSTATUS 0x400 MIC check result ENABLE 0x500 Enable MODE 0x504 Operation mode CNFPTR 0x508 Pointer to data structure holding AES key and NONCE vector INPTR 0x50C Input pointer OUTPTR 0x510 Output pointer SCRATCHPTR 0x514 Pointer to data area used for temporary storage 4454_140 v1.0 90 |
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