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Table 7-8 shows the typical configuration of a device operating promiscuous mode.
Table 7-8. Configuration of Promiscuous Mode.
Register
Address
0x20,0x21
0x22,0x23
0x24
…
0x2B
0x17
0x2E
0x2E
Register
Bits
1
4
7:6
Register Name
SHORT_ADDR_0/1
PAN_ADDR_0/1
IEEE_ADDR_0
…
IEEE_ADDR_7
AACK_PROM_MODE
AACK_DIS_ACK
AACK_FVN_MODE
Description
Each address shall be set: 0x00.
1 : Enable promiscuous mode.
1 : Disable generation of acknowledgment.
Controls the ACK behavior, depends on
FCF frame version number.
0x00 : Acknowledges only frames with
version number 0, that is according to
IEEE 802.15.4-2003 frames.
0x01 : Acknowledges only frames with
version number 0 or 1, that is 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.
If the Atmel AT86RF232 radio transceiver is in promiscuous mode, second level of
filtering according to IEEE 802.15.4-2006, Section 7.5.6.2, is applied to a received
frame. However, an IRQ_3 (TRX_END) is issued even if the FCS is invalid. Thus, it is
necessary to read register bit RX_CRC_VALID (register 0x06, PHY_RSSI) after
IRQ_3 (TRX_END) in order to verify the reception of a frame with a valid FCS.
If a device, operating in promiscuous mode, receives a frame with a valid FCS which
further passed the third level of filtering
according to IEEE 802.15.4-2006,
Section 7.5.6.2, an acknowledgement frame would be transmitted. According to the
definition of the promiscuous mode a received frame shall not be acknowledged, even if
it is requested. Thus register bit AACK_DIS_ACK (register 0x2E, CSMA_SEED_1) has
to be set to one.
In all receive modes an IRQ_5 (AMI) interrupt is issued, when the received frame
matches the node’s address according to the filter rules described in Section 7.2.3.4 .
Alternatively, in Basic Operating Mode RX_ON state, when a valid PHR is detected, an
IRQ_2 (RX_START) is generated and the frame is received. The end of the frame
reception is signalized with an IRQ_3 (TRX_END). At the same time the register bit
RX_CRC_VALID (register 0x06, PHY_RSSI) is updated with the result of the FCS
check (see Section 8.2 ). According to the promiscuous mode definition the register bit
RX_CRC_VALID needs to be checked in order to dismiss corrupted frames.
52
AT86RF232
8321A – MCU Wireless – 10/11
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