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NRF52820-QDAA-R Datasheet(PDF) 184 Page - Nordic Semiconductor

Part # NRF52820-QDAA-R
Description  nRF52820
PDF  437 Pages
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Manufacturer  NORDIC [Nordic Semiconductor]
Direct Link  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NRF52820-QDAA-R Datasheet(HTML) 184 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 74: 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.
6.12.13.8 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 two frames from being 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 in use, the TIFS register must be updated
manually. The following figure provides details on what IFS period is valid in both acknowledged and
unacknowledged transmissions.
4463_156 v1.0
184



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