EM2420 ETC [List of Unclassifed Manufacturers], EM2420 Datasheet - Page 39

• Manufacturer Part Number: EM2420
• Description: 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver
• Manufacturer: ETC [List of Unclassifed Manufacturers]

Figure 20. Unbuffered test mode, pin activity
Address Recognition
The EM2420 includes hardware support for
address recognition, as specified in [1].
Hardware address recognition may be
enabled
MDMCTRL0.ADR_DECODE control bit.
Address recognition is based on the
following requirements, listed from section
7.5.6.2 in [1]:
Ember Part Number: 120-0049-000C
FIFO (from EM2420)
Incoming / outgoing
•
•
•
•
FIFO (from uC)
Transmit mode:
Receive mode:
The frame type subfield shall not
contain an illegal frame type
If the frame type indicates that the
frame is a beacon frame, the
source PAN identifier shall match
macPANId unless macPANId is
equal to 0xFFFF, in which case
the
accepted regardless of the source
PAN identifier.
If a destination PAN identifier is
included in the frame, it shall
match macPANId or shall be the
broadcast
(0xFFFF).
If a short destination address is
included in the frame, it shall
match either macShortAddress or
the broadcast address (0xFFFF).
Otherwise
destination address is included in
the
aExtendedAddress.
/
beacon
RF data
frame,
FIFOP
FIFOP
disabled
if
PAN
frame
it
an
Preamble
shall
using
shall
extended
identifier
match
EM2420 Datasheet
the
be
SFD
4 us
b0
If any of the above requirements are not
satisfied
enabled, the EM2420 will disregard the
incoming frame and flush the data from
the RXFIFO. Only data from the rejected
frame is flushed, data from previously
accepted frames may still be in the
RXFIFO.
Incoming frames with reserved frame
types (FCF frame type subfield is 4, 5, 6 or
7)
RESERVED_FRAME_MODE control bit in
MDMCTRL0 is set. In this case, no further
address recognition is performed on these
frames. This option is included for future
expansions
standard.
If a frame is rejected, the EM2420 will only
start searching for a new frame after the
rejected frame
received (as defined by the length field) to
avoid detecting false SFDs within the
frame.
The
control bit must be correctly set, since
parts of the address recognition procedure
b1
•
b2
is
b3
If only source addressing fields
are included in a data or MAC
command frame, the frame shall
only be accepted if the device is a
PAN coordinator and the source
PAN
macPANId.
b4
MDMCTRL0.PAN_COORDINATOR
however
and
b5
s0
b6
of
b7
address
has been completely
b8
identifier
the
b9
accepted
s1
b10 b11
EM2420
IEEE
recognition
b8
b9
b0
Page 39 of 89
s2
b10 b11
b1
802.15.4
matches
if
b2
b3
the
b4
is