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參數(shù)資料
| 型號： | HFA3861AIN |
| 廠商： | INTERSIL CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 288 MACROCELL 3.3 VOLT ISP CPLD |
| 中文描述： | TELECOM, CELLULAR, BASEBAND CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, PLASTIC, MS-026ACD, TQFP-64 |
| 文件頁數(shù)： | 11/37頁 |
| 文件大小： | 440K |
| 代理商： | HFA3861AIN |
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as received from the control processor. Some dummy bits
will be appended to the end of the packet to insure an
orderly shutdown of the transmitter. This prevents
spectrum splatter. At the end of a packet, the external
controller is expected to de-assert the TX_PE line to shut
the transmitter down.
Scrambler and Data Encoder Description
The modulator has a data scrambler that implements the
scrambling algorithm specified in the IEEE 802.11 standard.
This scrambler is used for the preamble, header, and data in
all modes. The data scrambler is a self synchronizing circuit.
It consists of a 7-bit shift register with feedback from
specified taps of the register. Both transmitter and receiver
use the same scrambling algorithm. The scrambler can be
disabled by setting CR32 bit 2 to 1.
NOTE: Be advised that the IEEE 802.11 compliant scrambler in the
HFA3861A has the property that it can lock up (stop scrambling) on
random data followed by repetitive bit patterns. The probability of this
happening is 1/128. The patterns that have been identified are all
zeros, all ones, repeated 10s, repeated 1100s, and repeated
111000s. Any break in the repetitive pattern will restart the
scrambler. To insure that this does not cause any problem, the CCK
waveform uses a ping pong differential coding scheme that breaks
up repetitive 0s patterns.
PREAMBLE (SYNC)
128/56 BITS
SFD
16 BITS
SIGNAL FIELD
8 BITS
SERVICE FIELD
8 BITS
LENGTH FIELD
16 BITS
CRC16
16 BITS
HEADER
PREAMBLE
FIGURE 8. 802.11 PREAMBLE/HEADER
HFA3861A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HFA3863IN | Direct Sequence Spread Spectrum Baseband Processor |
| HFA3863IN96 | Direct Sequence Spread Spectrum Baseband Processor |
| HFA3863 | Direct Sequence Spread Spectrum Baseband Processor(直接序列擴譜基帶處理器) |
| HFA3983IV96 | 2.4GHz Power Amplifier and Detector |
| HFA3983 | 2.4GHz Power Amplifier and Detector(2.4GHz 功率放大器探測器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HFA3861AIN96 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Direct Sequence Spread Spectrum Baseband Processo |
| HFA3861B | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Direct Sequence Spread Spectrum Baseband Processor |
| HFA3861BIN | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Direct Sequence Spread Spectrum Baseband Processor |
| HFA3861BIN96 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Direct Sequence Spread Spectrum Baseband Processor |
| HFA3861IV | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Direct Sequence Spread Spectrum Baseband Processor |
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