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A radio transceiver state change, except a transition to SLEEP, or RESET state, does
not affect the Frame Buffer contents. If the radio transceiver is forced into SLEEP, the
Frame Buffer is powered off and the stored data gets lost.
9.3.2 User accessible Frame Content
The Atmel AT86RF232 supports an IEEE 802.15.4 compliant frame format as shown in
Figure 9-6 .
Figure 9-6. AT86RF232 Frame Structure.
0
Length [octets]
4
5
6
n+3
n+5
n+6
n+7
n+8
Frame
Preamble Sequence
SFD
PHR
Payload
FCS
LQI (1)
ED (1)
RX_STATUS (1)
Duration
Access
4 octets
SHR not accesible
PHY generated
Note:
1
1.
n octets ( n <= 128)
TX: Frame Buffer content
RX: Frame Buffer content
Stored into Frame Buffer during frame reception.
3 octets
A frame comprises two sections, the radio transceiver internally generated SHR field
and the user accessible part stored in the Frame Buffer. The SHR contains the
preamble and the SFD field. The variable frame section contains the PHR and the
PSDU including the FCS, see Section 8.2 .
To access the data follow the procedures described in Section 6.2.2 .
The frame length information (PHR field) and the PSDU are stored in the Frame Buffer.
During frame reception, the link quality indicator (LQI) value, the energy detection (ED)
value, and the status information (RX_STATUS) of a received frame are additionally
stored, see Section 8.6 , Section 8.4 , and Section 6.2.2 , respectively. The radio
transceiver appends these values to the frame data during Frame Buffer read access.
If the SRAM read access is used to read an RX frame, the frame length field (PHR) can
be accessed at address zero. The SHR cannot be read by the microcontroller.
For frame transmission, the PHR and the PSDU needs to be stored in the Frame
Buffer. The maximum frame size supported by the radio transceiver is 128 bytes. If the
register bit TX_AUTO_CRC_ON is set in register 0x05 (PHY_TX_PWR), the FCS field
of the PSDU is replaced by the automatically calculated FCS during frame
transmission. There is no need to write the FCS field when using the automatic FCS
generation.
To manipulate individual bytes of the Frame Buffer a SRAM write access can be used
instead.
For non IEEE 802.15.4 compliant frames, the minimum frame length supported by the
radio transceiver is one byte (Frame Length Field + one byte of data).
9.3.3 Interrupt Handling
Access conflicts may occur when reading and writing data simultaneously at the two
independent ports of the Frame Buffer, TX/RX BBP and SPI. These ports have their
own address counter that points to the Frame Buffer’s current address.
Access violations occurs during concurrent Frame Buffer read or write accesses, when
the SPI port’s address count er value becomes higher than or equal to that of TX/RX
BBP port.
106
AT86RF232
8321A – MCU Wireless – 10/11
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