參數(shù)資料
型號： CC2420
廠商： Electronic Theatre Controls, Inc.
英文描述： 2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver
中文描述： 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee功能的RF收發(fā)器
文件頁數(shù)： 36/87頁
文件大?。?/td> 1418K
代理商： CC2420
SmartRF
CC2420
as shown in Figure 16. 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
18. 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.
CC2420
recognition, as described in the Address
Recognition section on page 39.
includes
hardware
address
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 18. 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 16. 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
The FCS polynomial is [1]:
x
16
+ x
12
+ x
5
+ 1
The
CC2420
hardware implementation is
shown in Figure 19. Please refer to [1] for
further details.
In transmit mode the FCS is appended at
the correct position defined by the length
field. The FCS is not written to the
TXFIFO, but stored in a separate 16-bit
register.
In receive mode the FCS is verified by
hardware. The user is normally only
interested in the correctness of the FCS,
not the FCS sequence itself. The FCS
sequence itself is therefore not written to
the RXFIFO during receive.
Instead, when
MODEMCTRL0.AUTOCRC
is
set the two FCS bytes are replaced by the
RSSI value, average correlation value
(used for LQI) and CRC OK/not OK. This
is illustrated in Figure 20.
The first FCS byte is replaced by the 8-bit
RSSI value. See the RSSI section on
page 47 for details.
The 7 least significant bits in the last FCS
byte are replaced by the average
correlation value of the 8 first symbols of
the received PHY header (length field) and
PHY Service Data Unit (PSDU). This
correlation value may be used as a basis
for calculating the LQI. See the Link
Quality Indication section on page 48 for
details.
The most significant bit in the last byte of
each frame is set high if the CRC of the
received frame is correct and low
otherwise.
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.2), 2004-06-09
Page 36 of 87
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CC2420/T&R 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver
CC2420/TR 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver
CC2420DBK 功能描述:Zigbee/802.15.4開發(fā)工具 CC2420 DEMO KIT 2 DEMO BOARDS RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓:
CC2420DK 功能描述:Zigbee/802.15.4開發(fā)工具 CC2420 DEVELOPMENT KIT RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓:
CC2420EMK 功能描述:Zigbee/802.15.4開發(fā)工具 CC2420 EVALUATION KT (2)PCBs & (2)ANTENNA RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓:
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