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參數(shù)資料
| 型號(hào)： | EM2420TR |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver |
| 中文描述： | 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee的射頻收發(fā)器 |
| 文件頁(yè)數(shù)： | 34/89頁(yè) |
| 文件大小： | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 34 of 89
The
EM2420
has hardware support for
parts of the IEEE 802.15.4 frame format.
This section gives a brief summary to the
IEEE
802.15.4
frame
describes how the
EM2420
is set up to
comply with this.
format,
and
Figure 15 [1] shows a schematic view of
the IEEE 802.15.4 frame format. Similar
figures describing specific frame formats
(data
frames,
acknowledgment
frames
command frames) are included in [1].
beacon
frames,
MAC
and
PHY
Layer
Frame
Control Field
(FCF)
Data
Sequence
Number
MAC Header (MHR)
2
1
Bytes:
Address
Information
0 to 20
Frame payload
n
Frame Check
Sequence
(FCS)
MAC Footer
(MFR)
2
MAC Payload
Frame
Length
MAC Protocol
Data Unit
(MPDU)
PHY Service Data Unit
(PSDU)
Start of Frame
Delimiter
(SFD)
Bytes:
1
1
5 + (0 to 20) + n
Preamble
Sequence
4
Synchronisation Header
(SHR)
PHY Header
(PHR)
PHY Protocol Data Unit
(PPDU)
11 + (4 to 20) + n
MAC
Layer
Figure 15. Schematic view of the IEEE 802.15.4 Frame Format [1]
Synchronization header
The
consists of the preamble sequence
followed by the start of frame delimiter
(SFD). In [1], the preamble sequence is
defined to be 4 bytes of 0x00. The SFD is
one byte, set to 0xA7.
synchronisation
header
(SHR)
In the
EM2420
, the preamble length and
SFD is configurable. The default values
are compliant with [1]. Changing these
values will make the system non-802.15.4-
compliant, which could be desirable in
some cases.
A synchronisation header is always
transmitted first in all transmit modes.
The preamble sequence length can be set
by
MDMCTRL0.PREAMBLE_LENGTH
, while
the SFD is programmed in the
SYNCWORD
register.
SYNCWORD
is 2 bytes long, which
gives the user some extra flexibility as
described below. Figure 16 shows how the
EM2420
synchronisation header relates to
the IEEE 802.15.4 specification.
The programmable preamble length only
applies to transmission, it does not affect
receive mode. The preamble length
should not be set shorter than the default
value. Note that 2 of the 8 zero-symbols in
the preamble sequence required by [1] are
included in the
SYNCWORD
register so that
the
EM2420
preamble sequence is only 6
symbols long for compliance with [1]. Two
additional zero symbols in
SYNCWORD
make the
EM2420
compliant with [1].
In reception, the
EM2420
synchronizes to
received zero-symbols and searches for
the SFD sequence defined by the
SYNCWORD
register. The least significant
symbols in
SYNCWORD
set to 0xF will be
ignored, while symbols different from 0xF
will be required for synchronisation. The
default setting of 0xA70F thereby requires
one
additional
synchronisation. This will reduce the
number of false frames detected due to
noise.
zero-symbol
for
In receive mode, the
EM2420
uses the
preamble
sequence
synchronisation and frequency offset
adjustments. The SFD is used for byte
synchronisation, and is not part of the data
stored in the receive buffer (RXFIFO).
for
symbol
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