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CC2430F32RTC 参数 Datasheet PDF下载

CC2430F32RTC图片预览
型号: CC2430F32RTC
PDF下载: 下载PDF文件 查看货源
内容描述: 真正的系统级芯片解决方案的2.4 GHz IEEE 802.15.4 / ZigBee的 [A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee]
分类和应用: 电信集成电路
文件页数/大小: 212 页 / 1862 K
品牌: TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
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CC2430  
Radio  
:
Frame Format  
Digital  
IF Channel  
Filtering  
Frequency  
Offset  
Compensation  
Digital  
Data  
Filtering  
Symbol  
Correlators and  
Synchronisation  
Data  
Symbol  
Output  
I / Q Analog  
IF signal  
ADC  
Average  
Correlation  
Value (may be  
used for LQI)  
RSSI  
Generator  
RSSI  
Figure 38: Demodulator Simplified Block Diagram  
14.12 Frame Format  
Figure 39 [1] shows a schematic view of the  
IEEE 802.15.4 frame format. Similar figures  
describing specific frame formats (data  
frames, beacon frames, acknowledgment  
frames and MAC command frames) are  
included in [1].  
CC2430 has hardware support for parts of the  
IEEE 802.15.4 frame format. This section  
gives a brief summary to the IEEE 802.15.4  
frame format, and describes how CC2430 is  
set up to comply with this.  
Bytes:  
2
1
Data  
Sequence  
Number  
0 to 20  
n
2
Frame  
Frame Check  
Sequence  
(FCS)  
MAC Footer  
(MFR)  
MAC  
Layer  
Address  
Information  
Control Field  
(FCF)  
Frame payload  
MAC Payload  
MAC Header (MHR)  
Bytes:  
4
1
1
5 + (0 to 20) + n  
Start of frame  
Delimiter  
(SFD)  
MAC Protocol  
Data Unit  
(MPDU)  
PHY  
Layer  
Preamble  
Sequence  
Frame  
Length  
Synchronisation Header  
PHY Header  
(PHR)  
PHY Service Data Unit  
(SHR)  
(PSDU)  
11 + (0 to 20) + n  
PHY Protocol Data Unit  
(PPDU)  
Figure 39: Schematic view of the IEEE 802.15.4 Frame Format [1]  
14.13 Synchronization header  
The synchronization header (SHR) consists of  
the preamble sequence followed by the start of  
frame delimiter (SFD). In [1], the preamble  
sequence is defined to be four bytes of 0x00.  
The SFD is one byte, set to 0xA7.  
The programmable preamble length only  
applies to transmission, it does not affect  
receive mode. The preamble length should not  
be set shorter than the default value. Note that  
2 of the 8 zero-symbols in the preamble  
sequence required by [1] are included in the  
SYNCWORDH:SYNCWORDLregisters so that the  
CC2430 preamble sequence is only 6 symbols  
long for compliance with [1]. Two additional  
zero symbols in SYNCWORDH:SYNCWORDL  
make CC2430 compliant with [1].  
In CC2430, the preamble length and SFD is  
configurable. The default values are compliant  
with [1]. Changing these values will make the  
system non-compliant to IEEE 802.15.4.  
A
synchronization  
header  
is  
always  
transmitted first in all transmit modes.  
In reception, CC2430 synchronizes to received  
zero-symbols and searches for the SFD  
The preamble sequence length can be set with  
RF register bit  
MDMCTRL0L.PREAMBLE_LENGTH, while the  
SFD is programmed in the  
SYNCWORDH:SYNCWORDL registers.  
SYNCWORDH:SYNCWORDL is two bytes long,  
which gives the user some extra flexibility as  
described below. Figure 40 shows how the  
CC2430 synchronization header relates to the  
IEEE 802.15.4 specification.  
sequence  
SYNCWORDH:SYNCWORDL registers. The least  
significant symbols in  
defined  
by  
the  
SYNCWORDH:SYNCWORDL set to 0xF will be  
ignored, while symbols different from 0xF will  
be required for synchronization. The default  
setting of 0xA70F thereby requires one  
additional zero-symbol for synchronization.  
This will reduce the number of false frames  
detected due to noise.  
CC2430 Data Sheet (rev. 2.1) SWRS036F  
Page 161 of 211