NRF52811-QCAA-R7 datasheet(109/444 Pages) NORDIC

109 / 444 page

Peripherals

Symbol

Description

Min.

Typ.

Max.

Units

VVDD-VREF

Required difference between VDD and a selected VREF, VDD

> VREF

0.3

tINT_REF,START

Startup time for the internal bandgap reference

µS

EINT_REF

Internal bandgap reference error

-3

VINPUTOFFSET

Input offset

-10

tCOMP,START

Startup time for the comparator core

µS

6.6 ECB — AES electronic codebook mode encryption

The AES electronic codebook mode encryption (ECB) can be used for a range of cryptographic functions

like hash generation, digital signatures, and keystream generation for data encryption/decryption. The ECB

encryption block supports 128 bit AES encryption (encryption only, not decryption).

AES ECB operates with EasyDMA access to system Data RAM for in-place operations on cleartext

and ciphertext during encryption. ECB uses the same AES core as the CCM and AAR blocks and is an

asynchronous operation which may not complete if the AES core is busy.

AES ECB features:

• 128 bit AES encryption

• Supports standard AES ECB block encryption

• Memory pointer support

• DMA data transfer

AES ECB performs a 128 bit AES block encrypt. At the STARTECB task, data and key is loaded into the

algorithm by EasyDMA. When output data has been written back to memory, the ENDECB event is

triggered.

AES ECB can be stopped by triggering the STOPECB task.

6.6.1 Shared resources

The ECB, CCM, and AAR share the same AES module. The ECB will always have lowest priority and if there

is a sharing conflict during encryption, the ECB operation will be aborted and an ERRORECB event will be

generated.

6.6.2 EasyDMA

The ECB implements an EasyDMA mechanism for reading and writing to the Data RAM. This DMA cannot

access the program memory or any other parts of the memory area except RAM.

If the ECBDATAPTR is 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.

The EasyDMA will have finished accessing the Data RAM when the ENDECB or ERRORECB is generated.

6.6.3 ECB data structure

Input to the block encrypt and output from the block encrypt are stored in the same data structure.

ECBDATAPTR should point to this data structure before STARTECB is initiated.

Property

Address offset

Description

KEY

16 byte AES key

CLEARTEXT

16 byte AES cleartext input block

CIPHERTEXT

16 byte AES ciphertext output block

Table 32: ECB data structure overview

4454_140 v1.0

109

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