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NRF52811-QCAA-R7 bảng dữ liệu(PDF) 201 Page - Nordic Semiconductor |
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NRF52811-QCAA-R7 bảng dữ liệu(HTML) 201 Page - Nordic Semiconductor |
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201 / 444 page ![]() 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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