參數(shù)資料
型號(hào)： 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(yè)數(shù)： 45/87頁(yè)
文件大?。?/td> 1418K
代理商： CC2420
SmartRF
CC2420
CC2420
gives the user full flexibility in
selecting the flags for both nonces. The
flag setting is stored in the most significant
byte of the nonce. The flag byte used for
encryption and authentication is then
generated as shown in Figure 25.
The frame counter part of the nonce must
be incremented for each new packet by
software.
7
6
CTR Flag
bits 7:6
5
4
CBC Flag
bits 7:6
3
2
1
0
-
L
7
6
Res
5
4
3
2
1
0
L
7
6
Adata
5
4
3
2
1
0
M
L
0
0
0
SECCTRL0.SEC_M
MSB in CC2420 nonce RAM
CTR mode flag byte
CBC-MAC flag byte
Res
Res
Figure 25.
CC2420
Security Flag Byte
Stand-alone encryption
Plain AES encryption, with 128 bit
plaintext and 128 bit keys [2], is available
using
stand-alone
plaintext is stored in stand-alone buffer
located at RAM location 0x120, as can be
seen from Table 6 on page 29.
encryption.
The
A stand-alone encryption operation is
initiated by using the SAES command
strobe.
The
(
SECCTRL0.SEC_SAKEYSEL
) is then used
to encrypt the plaintext written to the
stand-alone buffer. Upon completion of the
encryption operation, the ciphertext is
written back to the stand-alone buffer,
thereby overwriting the plaintext.
selected
key
Note that RAM write operations also
output data currently in RAM, so that a
new plaintext may be written at the same
time
as
reading
ciphertext.
out
the
previous
In-line security operations
CC2420
can do MAC security operations
(encryption, decryption and authentication)
on frames within the TXFIFO and
RXFIFO. These operations are called in-
line security operations.
As with other MAC hardware support
within
CC2420
, in-line security operation
relies on the length field in the PHY
header. A correct length field must
therefore
operations.
be
used
for
all
security
The key, nonce (does not apply to CBC-
MAC), and
SECCTRL0
and
SECCTRL1
control registers must be correctly set
before
starting
any
operation.
in-line
security
The in-line security mode is set in
SECCTRL0.SEC_MODE
to one of the
following modes:
Disabled
CBC-MAC (authentication)
CTR (encryption / decryption)
CCM (authentication and encryption /
decryption)
When enabled, TX in-line security is
started in one of two ways:
Issue a
STXENC
command strobe. In-
line security will be performed within
the TXFIFO, but a RF transmission
will not be started. Ciphertext may be
read back using RAM read operations.
Issue
a
STXON
command strobe. In-line security will
be performed within the TXFIFO and a
RF transmission of the ciphertext is
started.
or
STXONCCA
When enabled, RX in-line security is
started as follows:
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.2), 2004-06-09
Page 45 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(kāi)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(píng)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(kāi)發(fā)工具 CC2420 DEVELOPMENT KIT RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評(píng)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(kāi)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(píng)估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓:
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