NRF52820-QDAA-R datasheet(89/437 Pages) NORDIC

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Peripherals

AAR

ADDR

Scratch area

IRK data

structure

ADDR: resolvable address

ADDRPTR

SCRATCHPTR

IRKPTR

RESOLVED

START

Figure 26: Address resolution with packet preloaded into RAM

6.2.3 Use case example for chaining RADIO packet reception with

address resolution using AAR

AAR may be started as soon as the 6 bytes required by AAR have been received by RADIO and stored in

RAM. The ADDRPTR pointer must point to the start of packet.

AAR

ADDR

Scratch area

IRK data

structure

RADIO

RXEN

From remote

transmitter

S0: S0 field of RADIO (optional)

L: Length field of RADIO (optional)

S1: S1 field of RADIO (optional)

ADDR: resolvable address

PACKETPTR

ADDRPTR

SCRATCHPTR

IRKPTR

RESOLVED

START

Figure 27: Address resolution with packet loaded into RAM by RADIO

6.2.4 IRK data structure

The IRK data structure is located in RAM at the memory location specified by the IRKPTR register.

Property

Address offset

Description

IRK0

IRK number 0 (16 bytes)

IRK1

IRK number 1 (16 bytes)

IRK15

240

IRK number 15 (16 bytes)

Table 21: IRK data structure overview

6.2.5 Registers

Base address

Peripheral

Instance

Description

Configuration

0x4000F000

AAR

Accelerated address resolver

Table 22: Instances

Offset

Description

TASKS_START

0x000

Start resolving addresses based on IRKs specified in the IRK data structure

TASKS_STOP

0x008

Stop resolving addresses

EVENTS_END

0x100

Address resolution procedure complete

4463_156 v1.0

NRF52820-QDAA-R Datasheet(PDF) 89 Page - Nordic Semiconductor

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