AT86RF231-ZU_09 Datasheet, PDF (83/198 Pages) ATMEL Corporation – Low Power 2.4 GHz Transceiver for ZigBee

AT86RF231
8.1.2.3
8.1.2.4
8.1.2.5
• Bit [15:14]:
the "Source Addressing Mode" subfield, with similar meaning as "Destination Addressing Mode",
see Table 8-3 on page 82.
The subfields of the FCF (Bits 0-2, 3, 6, 10-15) affect the address filter logic of the AT86RF231
while operating in RX_AACK operation, see Section 7.2.3 “RX_AACK_ON - Receive with Auto-
matic ACK” on page 51.
Frame Compatibility between IEEE 802.15.4-2003 and IEEE 802.15.4-2006
All unsecured frames according to IEEE 802.15.4-2006 are compatible with unsecured frames
compliant with IEEE 802.15.4-2003 with two exceptions: a coordinator realignment command
frame with the "Channel Page" field present (see IEEE 802.15.4-2006, section 7.3.8) and any
frame with a MAC Payload field larger than aMaxMACSafePayloadSize octets.
Compatibility for secured frames is shown in Table 8-5 on page 83, which identifies the security
operating modes for IEEE 802.15.4-2006.
Table 8-5. Frame Control Field - Security and Frame Version
Frame Control Field Bit Assignments Description
Security Enabled
b₃
0
Frame Version
b₁₃ b₁₂
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
Sequence Number
The one-octet sequence number following the FCF identifies a particular frame, so that dupli-
cated 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.
Addressing Fields
The addressing fields of the MPDU are used by the AT86RF231 for address matching indica-
tion. The destination address (if present) is always first, followed by the source address (if
present). Each address field consists of the Intra PAN ID and a device address. If both
addresses are present, and the "Intra PAN-ID compression" subfield in the FCF is set to one, the
source Intra 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 AT86RF231 has been
designed to apply to IEEE 802.15.4 compliant frames. It can be configured to handle other frame
formats and exceptions.
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