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? Bit 7:6 - AACK_FVN_MODE
Controls the ACK behaviour dependent from FCF frame version number within
RX_AACK mode.
Table 7-30. AACK_FVN_MODE.
Register Bits
AACK_FVN_MODE
Value
0
1
2
3
Description
Accept frames with version number 0
Accept frames with version number 0 or 1
Accept frames with version number 0 or 1 or 2
Accept frames independent of frame version number
Note:
1.
AACK_FVN_MODE value one indicates frames according to IEEE-802.15.4-2006,
a value of three indicates frames according to IEEE-802.15.4-2003 standard.
The frame control field of the MAC header (MHR) contains a frame version subfield.
The setting of register bits AACK_FVN_MODE specifies the frame filtering behavior of
the Atmel AT86RF232. According to the content of these register bits the radio
transceiver passes frames with a specific frame version number, number group, or
independent of the frame version number.
Thus the register bits AACK_FVN_MODE defines the maximum acceptable frame
version. Received frames with a higher frame version number than configured do not
pass the address filter and are not acknowledged.
The frame version field of the acknowledgment frame is set to zero according to
IEEE 802.15.4-2006, Section 7.2.2.3.1 Acknowledgment frame MHR fields.
? Bit 5 - AACK_SET_PD
The content of AACK_SET_PD bit is copied into the frame pending subfield of the
acknowledgment frame if the ACK is the answer to a data request MAC command
frame.
Table 7-31. AACK_SET_PD.
Register Bits
AACK_SET_PD
Value
0
1
Description
Pending data bit set to zero
Pending data bit set to one
In addition, if register bits AACK_FVN_MODE (register 0x2E, CSMA_SEED_1) are
configured to accept frames with a frame version other than zero or one, the content of
register bit AACK_SET_PD is also copied into the frame pending subfield of the
acknowledgment frame for any MAC command frame with a frame version of two or
three that have the security enabled subfield set to one. This is done in the assumption
that a future version of the standard [1] might change the length or structure of the
auxiliary security header.
72
AT86RF232
8321A – MCU Wireless – 10/11
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