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NRF52811-QCAA-R7 Datasheet(PDF) 201 Page - Nordic Semiconductor

Part # NRF52811-QCAA-R7
Description  nRF52811
PDF  444 Pages
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Manufacturer  NORDIC [Nordic Semiconductor]
Direct Link  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NRF52811-QCAA-R7 Datasheet(HTML) 201 Page - Nordic Semiconductor

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Peripherals
PHY protocol data unit (PPDU)
Preamble sequence
SFD
Length
PHY payload
5 octets synchronization header (SHR)
1 octet
(PHR)
Maximum 127 octets (PSDU)
160 µs
32 µs
<=4064 µs
MAC protocol data unit (MPDU)
Length
PHY payload
1 octet
(PHR)
Maximum 127 octets (PSDU)
MAC protocol data unit (MPDU)
On air frame
In RAM frame
LQI
1 octet
FCF
2 octets
Omitted if CRC enabled
Median 3
Figure 83: IEEE 802.15.4 frame in data memory
A shortcut has been added between the FRAMESTART event and the BCSTART task. This can be used to
trigger a BCMATCH event after N bits, such as when inspecting the MAC addressing fields.
6.14.13.8 Interframe spacing (IFS)
The IEEE 802.15.4 standard defines a specific time that is alotted for the MAC sublayer to process received
data. Interframe spacing (IFS) is used to prevent that two frames are transmitted too close together. If the
transmission is requesting an acknowledgement, the space before the second frame shall be at least one
IFS period.
The IFS is determined to be one of the following:
• IFS equals macMinSIFSPeriod (12 symbols) if the MPDU is less than or equal to aMaxSIFSFrameSize (18
octets) octets
• IFS equals macMinLIFSPeriod (40 symbols) if the MPDU is larger than aMaxSIFSFrameSize
Using the efficient assisted modes in the RADIO, the TIFS will be programmed with the correct value based
on the frame being transmitted. If the assisted modes are not being used the user must update the TIFS
register manually. The figure below provides details on what IFS period is valid in both acknowledged and
unacknowledged transmissions.
4454_140 v1.0
201



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