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): 36/89頁(yè)
文件大?。?/td> 1758K
代理商: EM2420TR
EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 36 of 89
The FCS polynomial is [1]:
x
16
+ x
12
+ x
5
+ 1
The
EM2420
hardware implementation is
shown in Figure 18. 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 19.
The first FCS byte is replaced by the 8-bit
RSSI value. See the RSSI section on
page 48 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
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