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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)： | 35/89頁(yè) |
| 文件大?。?/td> | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 35 of 89
0
7
A
IEEE 802.15.4
Preamble
SFD
EM24
420
2·(
PREAMBLE_LENGTH
+ 1) zero symbols
0
0
0
0
0
0
0
SW0
SW0 =
SYNCWORD[3:0]
SW1 =
SYNCWORD[7:4]
SW2 =
SYNCWORD[11:8]
SW3 =
SYNCWORD[15:12]
SW1
SW2
SW3
if different from 'F', else '0'
if different from 'F', else '0'
if different from 'F', else '0'
if different from 'F', else '0'
Synchronisation Header
Figure 16. Transmitted Synchronization Header
Length field
The frame length field shown in Figure 15
defines the number of bytes in the MPDU.
Note that the length field does not include
the length field itself. It does however
include
the
FCS
Sequence), even if this is inserted
automatically by the
EM2420
hardware. It
also includes the MIC if authentication is
used.
(Frame
Check
The length field is 7 bits and has a
maximum value of 127. The most
significant bit in the length field is reserved
[1], and should be set to zero.
The
EM2420
hardware uses the length field
both for transmission and reception, so
this field must always be included even if
implementing a proprietary (non 802.15-4)
system.
In transmit mode, the length field is used
for underflow detection, as described in
the FIFO access section on page 29.
MAC protocol data unit
The FCF, data sequence number and
address information follows the length field
as shown in Figure 15. Together with the
MAC data payload and Frame Check
Sequence, they form the MAC Protocol
Data Unit (MPDU).
The format of the FCF is shown in Figure
17. Please refer to [1] for details.
There is no hardware support for the data
sequence number, this field must be
inserted and verified by software.
The
EM2420
includes hardware address
recognition, as described in the Address
Recognition section on page 39.
Bits: 0-2
3
4
5
6
7-9
10-11
12-13
14-15
Frame
Type
Security
Enabled
Frame
Pending
Acknowledge
request
Intra
PAN
Reserved
Destination
addressing
mode
Reserved
Source
addressing
mode
Figure 17. Format of the Frame Control Field (FCF) [1]
Frame check sequence
A 2-byte frame check sequence (FCS)
follows the last MAC payload byte as
shown in Figure 15. The FCS is calculated
over the MPDU, i.e. the length field is not
part of the FCS. This field is automatically
generated and verified by hardware when
the
MODEMCTRL0.AUTOCRC
control bit is
set. It is recommended to always have this
enabled, except possibly for debug
purposes. If cleared, CRC generation and
verification
must
be
software.
performed
by
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