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NRF52820-QDAA-R Datasheet(PDF) 102 Page - Nordic Semiconductor |
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NRF52820-QDAA-R Datasheet(HTML) 102 Page - Nordic Semiconductor |
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102 / 437 page  Peripherals Property Address offset Description HEADER 0 Packet Header LENGTH 1 Number of bytes in encrypted payload including length of MIC 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 MIC is not added to empty packets Table 29: Data structure for encrypted packet 6.4.8 EasyDMA and ERROR event CCM implements an EasyDMA mechanism for reading and writing to RAM. When the CPU and EasyDMA enabled peripherals access the same RAM block at the same time, increased bus collisions might disrupt on-the-fly encryption. This will generate an ERROR event. EasyDMA stops accessing 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 15 for more information about the different memory regions. 6.4.9 Registers Base address Peripheral Instance Description Configuration 0x4000F000 CCM CCM AES counter with CBC-MAC (CCM) mode block encryption Table 30: Instances Register Offset Description TASKS_KSGEN 0x000 Start generation of keystream. 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 Keystream 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 MAXPACKETSIZE 0x518 Length of keystream generated when MODE.LENGTH = Extended. RATEOVERRIDE 0x51C Data rate override setting. Table 31: Register overview 4463_156 v1.0 102 |
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