NRF52820-QDAA-R datasheet(172/437 Pages) NORDIC

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Peripherals

GUARD

PERIOD

REFERENCE PERIOD

SWITCH

SLOT

SAMPLE

SLOT

...

SWITCH

SLOT

SAMPLE

SLOT

SWITCH

SLOT

SAMPLE

SLOT

4 µs

8 µs

1 or 2 µs

16-160 µs

Figure 61: Constant tone extension (CTE) structure

Antenna switching is performed during switch slots and the guard period. The AoA/AoD feature requires

that one IQ sample is taken for each microsecond within the reference period, and once for each sample

slot. Oversampling is possible by changing the sample spacing as described in IQ sampling on page 175.

The switch slot and sample slot durations are either 1 or 2 µs, but must be equal. The format of the CTE

and switching and sampling procedures may be configured prior to, or during, packet transmission and

reception. Alternatively, during packet reception, these operations can be configured by reading specific

fields of the packet contents.

6.12.12.2 Mode

Depending on the DFEMODE, the device performs the procedures shown in the following table.

DFEMODE

AOA

AOD

Generating and transmitting CTE

Receiving, interpreting, and sampling CTE

AoA/AoD Procedure

Antenna switching

Table 55: AoA/AoD Procedures performed as a function of DFEMODE and TX/RX mode

6.12.12.3 Inline configuration

When inline configuration is enabled during RX, further configuration of the AoA/AoD procedures

is performed based on the values of the CP bit and the CTEInfo octet within the packet. This

is enabled by setting CTEINLINECONF.CTEINLINECTRLEN. The CTEInfo octet is present only if

the CP bit is set. The position of the CP bit and CTEInfo octet depends on whether the packet

has a Data Channel PDU (CTEINLINECONF.CTEINFOINS1=InS1), or an Advertising Channel PDU

(CTEINLINECONF.CTEINFOINS1=NotInS1).

Data channel PDU

For Data Channel PDUs, PCNF0.S0LEN must be 1 byte, and PCNF0.LFLEN must be 8 bits. To determine if S1

is present, the registers CTEINLINECONF.S0MASK and CTEINLINECONF.S0CONF forms a bitwise mask-and-

test for the S0 field. If the bitwise AND between S0 and S0MASK equals S0CONF, then S1 is determined to

be present. When present, the value of PCNF0.S1LEN will be ignored, as this is decided by the CP bit in the

the following figure.

Length

CTEInfo

...

5 bits

bits

8 bits

0 or 8

bits

bit

LENGTH

Figure 62: Data channel PDU header

When encrypting and decrypting BLE packets using the CCM peripheral, it is also required to set

PCNF0.S1INCL=1. The CCM mode must be configured to use an 8-bit length field. The value of the CP bit is

included in the calculation of the MIC, while the S1 field is ignored by the CCM calculation.

4463_156 v1.0

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NRF52820-QDAA-R Datasheet(PDF) 172 Page - Nordic Semiconductor

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