NRF52811-QCAA-R datasheet(182/444 Pages) NORDIC

182 / 444 page

Peripherals

Independent of the configuration of PCNF1.MAXLEN, the combined length of S0, LENGTH, S1, and

PAYLOAD cannot exceed 258 bytes.

6.14.2 Address configuration

The on-air radio ADDRESS field is composed of two parts, the base address field and the address prefix

field.

The size of the base address field is configurable via PCNF1.BALEN. The base address is truncated from the

least significant byte if the PCNF1.BALEN is less than 4. See Definition of logical addresses on page 182.

Logical address

Base address

Prefix byte

BASE0

PREFIX0.AP0

BASE1

PREFIX0.AP1

BASE1

PREFIX0.AP2

BASE1

PREFIX0.AP3

BASE1

PREFIX1.AP4

BASE1

PREFIX1.AP5

BASE1

PREFIX1.AP6

BASE1

PREFIX1.AP7

Table 59: Definition of logical addresses

The on-air addresses are defined in the BASE0/BASE1 and PREFIX0/PREFIX1 registers. It is only when

writing these registers that the user must relate to the actual on-air addresses. For other radio address

registers, such as the TXADDRESS, RXADDRESSES, and RXMATCH registers, logical radio addresses ranging

from 0 to 7 are being used. The relationship between the on-air radio addresses and the logical addresses

is described in Definition of logical addresses on page 182.

6.14.3 Data whitening

The RADIO is able to do packet whitening and de-whitening, enabled in PCNF1.WHITEEN. When enabled,

whitening and de-whitening will be handled by the RADIO automatically as packets are sent and received.

The whitening word is generated using polynomial g(D) = D7+ D4 + 1, which then is XORed with the data

packet that is to be whitened, or de-whitened. See the figure below.

Data in

Data out

Position

Figure 60: Data whitening and de-whitening

Whitening and de-whitening will be performed over the whole packet (except for the preamble and the

address field).

The linear feedback shift register in the figure above is initialized via register DATAWHITEIV on page 228.

6.14.4 CRC

The CRC generator in the RADIO calculates the CRC over the whole packet excluding the preamble. If

desirable, the address field can be excluded from the CRC calculation as well.

4454_140 v1.0

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