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NRF52820-QDAA-R Datasheet(PDF) 101 Page - Nordic Semiconductor |
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NRF52820-QDAA-R Datasheet(HTML) 101 Page - Nordic Semiconductor |
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101 / 437 page  Peripherals task in the AES CCM peripheral. The KSGEN task is triggered from the READY event in RADIO through a PPI connection. For long packets (MODE.LENGTH = Extended) the keystream generation will need to start even earlier, such as when the RXEN task in RADIO is triggered. Refer to Timing specification on page 109 for information about the time needed for generating a keystream. RU A H L RFU EPL MIC CRC ADDRESS RXEN END keystream generation KSGEN decryption CRYPT PPI ENDKSGEN ENDCRYPT P READY START SHORTCUT RADIO AES CCM RU: Ramp-up of RADIO P: Preamble A: Address H: Header (S0) L: Length RFU: reserved for future use (S1) EPL: encrypted payload : RADIO receiving noise READY PPI Figure 35: On-the-fly decryption of short packets (MODE.LENGTH = Default) using a PPI connection 6.4.7 CCM data structure The CCM data structure is located in Data RAM at the memory location specified by the CNFPTR pointer register. Property Address offset Description KEY 0 16 byte AES key PKTCTR 16 Octet0 (LSO) of packet counter 17 Octet1 of packet counter 18 Octet2 of packet counter 19 Octet3 of packet counter 20 Bit 6 – Bit 0: Octet4 (7 most significant bits of packet counter, with Bit 6 being the most significant bit) Bit7: Ignored 21 Ignored 22 Ignored 23 Ignored 24 Bit 0: Direction bit Bit 7 – Bit 1: Zero padded IV 25 8 byte initialization vector (IV) Octet0 (LSO) of IV, Octet1 of IV, … , Octet7 (MSO) of IV Table 27: CCM data structure overview The NONCE vector (as specified by the Bluetooth Core Specification) will be generated by hardware based on the information specified in the CCM data structure from CCM data structure overview on page 101 . Property Address offset Description HEADER 0 Packet Header LENGTH 1 Number of bytes in unencrypted payload RFU 2 Reserved Future Use PAYLOAD 3 Unencrypted payload Table 28: Data structure for unencrypted packet 4463_156 v1.0 101 |
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