Rainbow Electronics ATmega128RFA1 - Manual (Page 64)

64
8266A-MCU Wireless-12/09
ATmega128RFA1
Bit 6: the “Intra-PAN” subfield indicates that in a frame, where both, the destination and
source addresses are present, the PAN-ID of the source address filed is omitted. In
RX_AACK mode this bit is evaluated by the address filter logic of the radio transceiver.
Bit [11:10]: the “Destination Addressing Mode” subfield describes the format of the
destination address of the frame. The values of the address modes are summarized in
Table 9-17 below according to IEEE 802.15.4:
Table 9-17. Frame Control Field – Destination and Source Addressing Mode
Frame Control Field Bit Assignments
Addressing Mode
b
11
b
10
b
15
b
14
Value
Description
00 0 PAN identifier and address fields are not present
01 1 Reserved
10 2 Address field contains a 16-bit short address
11 3 Address field contains a 64-bit extended address
If the destination address mode is either 2 or 3 (i.e. if the destination address is
present), it always consists of a 16-bit PAN-ID first followed by either the 16-bit or 64-bit
address as defined by the mode.
Bit [13:12]: the “Frame Version” subfield specifies the version number corresponding to
the frame. These register bits are reserved in IEEE-802.15.4-2003.
This subfield shall be set to 0 to indicate a frame compatible with IEEE 802.15.4-2003
and 1 to indicate an IEEE 802.15.4-2006 frame. All other subfield values shall be
reserved for future use.
The bit AACK_FVN_MODE of register CSMA_SEED_1 controls the RX_AACK
behavior of frame acknowledgements. This register determines if, depending on the
Frame Version Number, a frame is acknowledged or not. This is necessary for
backward compatibility to IEEE 802.15.4-2003 and for future use. Even if frame version
numbers 2 and 3 are reserved, it can be handled by the radio transceiver. For details
refer to
"CSMA_SEED_1 – Transceiver Acknowledgment Frame Control Register 2" on
page 129 .
See IEEE 802.15.4-2006, section 7.2.3 for details on frame compatibility.
Table 9-18. Frame Control Field – Frame Version Subfield
Frame Control Field Bit Assignments
Frame Version
b
13
b
12
Value
Description
00 0 Frames are compatible with IEEE 802.15.4-2003
01 1 Frames are compatible with IEEE 802.15.4-2006
10 2 Reserved
11 3 Reserved
Bit [15:14]: the “Source Addressing Mode” subfield, with similar meaning as
“Destination Addressing Mode” (refer to
Table 9-17 above ).
The subfields of the FCF (Bits 0–2, 3, 6, 10–15) affect the address filter logic of the
radio transceiver while executing a RX_AACK operation (see
"RX_AACK_ON –
Receive with Automatic ACK" on page 46 ).