Rainbow Electronics ATmega128RFA1 - Manual (Page 53)

53
8266A-MCU Wireless-12/09
ATmega128RFA1
Reception of Reserved Frames
Frames with reserved frame types (see section Table 9-16 on page 63 ) can also be
handled in RX_AACK mode. This might be required when implementing proprietary,
non-standard compliant protocols. It is an extension of the address filtering in
RX_AACK mode. Received frames are either handled similar to data frames or may be
allowed to completely bypass the address filter.
Table 9-10 below shows the required configuration for a node to receive reserved
frames and Figure 9-19 on page 48 shows the corresponding flow chart.
Table 9-10. RX_AACK Configuration to Receive Reserved Frame Types
Register Name Register Bits Description
SHORT_ADDR_0/1
PAN_ADDR_0/1
IEEE_ADDR_0
…
IEEE_ADDR_7
Set node addresses
RX_SAFE_MODE 7 0 : disable frame protection
1 : enable frame protection
AACK_UPLD_RES_FT 4 1 : Enable reserved frame type reception
AACK_FLTR_RES_FT 5 Filter reserved frame types like data frame type,
see note below
0
: disable
1 : enable
SLOTTED_OPERATION 0 0 : if transceiver works in un-slotted mode
1 : if transceiver works in slotted mode
AACK_I_AM_COORD 3 0 : device is not PAN coordinator
1 : device is PAN coordinator
AACK_DIS_ACK 4 0 : Enable generation of acknowledgment
1 : Disable generation of acknowledgment
AACK_FVN_MODE 7:6 Controls the ACK behavior, depends on FCF
frame version number
0x00
: acknowledges only frames with version
number 0, i.e. according to IEEE 802.15.4-2003
frames
0x01
: acknowledges only frames with version
number 0 or 1, i.e. frames according to
IEEE 802.15.4-2006
0x10
: acknowledges only frames with version
number 0 or 1 or 2
0x11
: acknowledges all frames, independent of
the FCF frame version number
There are two different options for handling reserved frame types.
1. AACK_UPLD_RES_FT = 1, AACK_FLT_RES_FT = 0:
Any non-corrupted frame with a reserved frame type is indicated by a
TRX24_RX_END interrupt. No further address filtering is applied on those frames.
A TRX24_AMI interrupt is never generated and the acknowledgment subfield is
ignored.
2. AACK_UPLD_RES_FT = 1, AACK_FLT_RES_FT = 1: