NRF52811-QCAA-R datasheet(191/444 Pages) NORDIC

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Peripherals

Length

PDU Type

...

4 bits

8 bits

6 bits

4 bits

LENGTH

PAYLOAD

Extended

Header Length

AdvMode

...

CTEInfo

flag

2 bits

bits

1 bit

bits

...

Extended Header Flags

CTEInfo

8 bits

...

CRC

CTE

AdvA

TargetA

6 octets

Figure 73: Advertising channel PDU header

The CTEINLINECONF.S0CONF and CTEINLINECONF.S0MASK fields can be configured to accept only certain

advertising PDU Types. If the extended header length is non-zero, the CTEInfo extended header flag is

checked to determine whether CTEInfo is present. If a bit before the CTEInfo flag within the extended

header flags is set, then the CTEInfo position is postponed 6 octets.

CTEInfo parsing

The CTEInfo field is shown in the following figure.

CTETime

RFU

CTEType

5 bits

1 bit

2 bits

Figure 74: CTEInfo field

The CTETIME field defines the length of the CTE in 8 µs units. The valid upper bound of values can

be adjusted using CTEINLINECONF.CTETIMEVALIDRANGE, including allowing use of the RFU bit

within this field. If the CTETIME field is an invalid value of either 0 or 1, the CTE is assumed to be

the minimum valid length of 16 µs. The slot duration is determined by the CTEType field. In RX this

determines whether the sample spacing as defined in CTEINLINECONF.CTEINLINERXMODE1US or

CTEINLINECONF.CTEINLINERXMODE2US is used.

CTEType

Description

TX switch spacing

RX sample spacing during

reference period

Sample spacing RX during

reference period

AoA, no switching

TSAMPLESPACING1

TSAMPLESPACING2

AoD, 1 µs slots

2 µs

TSAMPLESPACING1

CTEINLINERXMODE1US

AoD, 2 µs slots

4 µs

TSAMPLESPACING1

CTEINLINERXMODE2US

Reserved for future use

Table 62: Switching and sampling spacing based on CTEType

6.14.12.4 Manual configuration

If CTEINLINECONF.CTEINLINECTRLEN is not set, then the packet is not parsed to determine the CTE

parameters, and the antenna switching and sampling is controlled by other registers, see Antenna

switching on page 192. The length of the CTE is given in 8 µs units by DFECTRL1.NUMBEROF8US. The

start of the antenna switching and/or sampling (denoted as an AoA/AoD procedure), can be configured

to start at some trigger with an additional offset. Using DFECTRL1.DFEINEXTENSION, the trigger can be

configured to be the end of the CRC, or alternatively, the ADDRESS event. The additional offset for antenna

switching is configured using DFECTRL2.TSWITCHOFFSET. Similarly, the additional offset for antenna

sampling is configured using DFECTRL2.TSAMPLEOFFSET.

6.14.12.5 Receive- and transmit sequences

The addition of the CTE to the transmitted packet is illustrated in the following figure.

4454_140 v1.0

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