NRF52820-QDAA-R datasheet(164/437 Pages) NORDIC

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Peripherals

• For MODE = Ble_2Mbit, the PREAMBLE must be set to 2 bytes through PCNF0.PLEN. If the first bit of

the ADDRESS is 0, the preamble will be set to 0xAAAA. Otherwise the PREAMBLE will be set to 0x5555.

• For MODE = Ble_LR125Kbit and MODE = Ble_LR500Kbit, the PREAMBLE is 10 repetitions of 0x3C.

• For MODE = Ieee802154_250Kbit, the PREAMBLE is 4 bytes and set to all zeros.

Radio packets are stored in memory inside instances of a RADIO packet data structure as illustrated below.

The PREAMBLE, ADDRESS, CI, TERM1, TERM2, and CRC fields are omitted in this data structure. Fields S0,

LENGTH, and S1 are optional.

LENGTH

PAYLOAD

LSByte

Figure 49: Representation of a RADIO packet in RAM

The byte ordering on air is always least significant byte first for the ADDRESS and PAYLOAD fields, and

most significant byte first for the CRC field. The ADDRESS fields are always transmitted and received

least significant bit first. The CRC field is always transmitted and received most significant bit first. The

endianness, i.e. the order in which the bits are sent and received, of the S0, LENGTH, S1, and PAYLOAD

fields can be configured via PCNF1.ENDIAN.

The sizes of the S0, LENGTH, and S1 fields can be individually configured via S0LEN, LFLEN, and S1LEN in

PCNF0 respectively. If any of these fields are configured to be less than 8 bits, the least significant bits of

the fields are used.

If S0, LENGTH, or S1 are specified with zero length, their fields will be omitted in memory. Otherwise each

field will be represented as a separate byte, regardless of the number of bits in their on-air counterpart.

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

PAYLOAD cannot exceed 258 bytes.

6.12.2 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 164.

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 the following table.

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 53: Definition of logical addresses

4463_156 v1.0

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