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參數(shù)資料
| 型號： | 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標準/ ZigBee的射頻收發(fā)器 |
| 文件頁數(shù)： | 37/89頁 |
| 文件大小： | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 37 of 89
Link Quality Indication section on page 49
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.
r0
r1
r2
r3
r4
r5
r6
r7
r8
r9
r10
r11
r12
r13
r14
r15
Data
input
(LSB
first)
Figure 18. The EM2420 Frame Check Sequence (FCS) hardware implementation [1]
MPDU
Length byte
n
MPDU
1
MPDU
2
MPDU
n-2
RSSI
(signed)
CRC / Corr
7
6
5
4
3
2
1
0
Bit number
CRC
OK
Correlation value (unsigned)
Data in RXFIFO
Figure
19.
Data
in
RXFIFO
when
MDMCTRL0.AUTOCRC
is
set
RF Data Buffering
The
EM2420
can be configured for different
transmit and receive modes, as set in the
MDMCTRL1.TX_MODE
MDMCTRL1.RX_MODE
Buffered mode (mode 0) will be used for
normal operation of the
EM2420
, while
other modes are available for test
purposes.
and
bits.
control
Buffered transmit mode
In buffered transmit mode (TX_MODE 0),
the 128 byte TXFIFO, located in the
EM2420
RAM, is used to buffer data before
transmission.
A
preamble
(defined in the Frame Format section
below) is automatically inserted before the
length field during transmission. The
length field must always be the first byte
written to the transmit buffer for all frames.
sequence
Writing one or multiple bytes to the
TXFIFO is described in the FIFO access
section on page 29. Reading data from the
TXFIFO is possible with RAM access, but
this does not remove the byte from the
FIFO.
Transmission is enabled by issuing a
STXON
or
STXONCCA
command strobe.
See the Radio control state machine
section on page 42 for an illustration of
how the transmit command strobes affect
the state of the
EM2420
. The
STXONCCA
strobe is ignored if the channel is busy.
See
the
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