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AT86RF232
7.2 Extended Operating Mode
The Extended Operating Mode is a hardware MAC accelerator and goes beyond the
basic radio transceiver functionality provided by the Basic Operating Mode. It handles
time critical MAC tasks as requested by the IEEE 802.15.4 standard, by hardware, such
as automatic acknowledgement, automatic CSMA-CA and retransmission. This results
in a more efficient IEEE 802.15.4 software MAC implementation including reduced code
size and may allow the use of a smaller microcontroller or to operate at low clock rates.
The Extended Operating Mode is designed to support IEEE 802.15.4-2006 and
IEEE 802.15.4-2011 compliant frames; the mode is backward compatible to
IEEE 802.15.4-2003 and supports non IEEE 802.15.4 compliant frames. This mode
comprises the following procedures:
Automatic acknowledgement (RX_AACK) divides into the tasks:
? Frame reception and automatic FCS check
? Configurable addressing fields check
? Interrupt indicating address match
? Interrupt indicating frame reception, if it passes address filtering and FCS check
? Automatic ACK frame transmission (if the received frame passed the address filter
and FCS check and if an ACK is required by the frame type and ACK request)
? Support of slotted acknowledgment using SLP_TR pin
Automatic CSMA-CA and Retransmission (TX_ARET) divides into the tasks:
? CSMA-CA including automatic CCA retry and random back-off
? Frame transmission and automatic FCS field generation
? Reception of ACK frame (if an ACK was requested)
? Automatic frame retry if ACK was expected but not received
? Interrupt signaling with transaction status
Automatic FCS check and generation, refer to Section 8.2 , is used by the RX_AACK
and TX_ARET modes. In RX_AACK mode, an automatic FCS check is always
performed for incoming frames.
In TX_ARET mode, an ACK, received within the time required by IEEE 802.15.4, is
accepted if the FCS is valid, and if the sequence number of the ACK matches the
sequence number of the previously transmitted frame. Dependent on the value of the
frame pending subfield in the received acknowledgement frame the transaction status is
set, see TRAC_STATUS, Section 7.2.7 .
An Atmel AT86RF232 state diagram including the Extended Operating Mode states is
shown in Figure 7-10 . Yellow marked states represent the Basic Operating Mode; blue
marked states represent the Extended Operating Mode.
43
8321A – MCU Wireless – 10/11
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