AT86RF212B_14 Datasheet, PDF (82/212 Pages) ATMEL Corporation – Fully integrated 769 – 935MHz transceiver including

Table 8-6. Frame Control Field – Security and Frame Version.
Frame Control Field Bit Assignments Description
Security Enabled
b3
Frame Version
b13 b12
0
00
No security. Frames are compatible between
IEEE 802.15.4-2003 and IEEE 802.15.4-2006.
0
01
No security. Frames are not compatible between
IEEE 802.15.4-2003 and IEEE 802.15.4-2006.
1
00
Secured frame formatted according to
IEEE 802.15.4-2003. This frame type is not
supported in IEEE 802.15.4-2006.
1
01
Secured frame formatted according to
IEEE 802.15.4-2006.
8.1.2.4 Sequence Number
The one-octet sequence number following the FCF identifies a particular frame, so that
duplicated frame transmissions can be detected. While operating in RX_AACK mode,
the content of this field is copied from the frame to be acknowledged into the
acknowledgment frame.
8.1.2.5 Addressing Fields
The addressing fields of the MPDU are used by the Atmel AT86RF212B for address
matching indication. The destination address (if present) is always first, followed by the
source address (if present). Each address field consists of the PAN-ID and a device
address. If both addresses are present, and the “PAN ID compression” subfield in the
FCF is set to one, the source PAN-ID is omitted.
Note that in addition to these general rules, IEEE 802.15.4 further restricts the valid
address combinations for the individual possible MAC frame types. For example, the
situation where both addresses are omitted (source addressing mode = 0 and
destination addressing mode = 0) is only allowed for acknowledgment frames. The
address filter in the AT86RF212B has been designed to apply to IEEE 802.15.4
compliant frames. It can be configured to handle other frame formats and exceptions.
8.1.2.6 Auxiliary Security Header Field
The Auxiliary Security Header specifies information required for security processing and
has a variable length. This field determines how the frame is actually protected (security
level) and which keying material from the MAC security PIB is used (see
IEEE 802.15.4-2006 [2], Section 7.6.1). This field shall be present only if the Security
Enabled subfield b3, see Section 8.1.2.3, is set to one. For details of its structure, see
IEEE 802.15.4-2006, Section 7.6.2 Auxiliary security header.
8.1.2.7 MAC Service Data Unit (MSDU)
This is the actual MAC payload. It is usually structured according to the individual frame
type. A description can be found in IEEE 802.15.4-2006, Section 5.5.3.2.
8.1.2.8 MAC Footer (MFR) Fields
The MAC footer consists of a two octet Frame Checksum (FCS), for details refer to
Section 8.3.
82 _AT86RF212B
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