參數資料
型號: L80227
廠商: LSI CORP
元件分類: 網絡接口
英文描述: 10BASE-T/100BASE-TX Ethernet Physical Layer Device (PHY)(10BASE-T/100BASE-TX 以太網物理層處理器)
中文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封裝: LQFP-64
文件頁數: 36/158頁
文件大?。?/td> 1084K
代理商: L80227
Draft 6/5/00
2-16
Functional Description
Copyright 1999 by LSI Logic Corporation. All rights reserved.
2.3.5 Scrambler
100BASE-TX transmission requires scrambling to reduce the radiated
emissions on the twisted pair. The scrambler takes the NRZI encoded
data from the 4B5B encoder, scrambles it per the IEEE 802.3
specifications, and sends it to the TP transmitter. A scrambler is not used
for 10 Mbits/s operation.
2.3.6 Descrambler
The descrambler block shown in
Figure 2.1
is used in
100BASE-TX operation. The device descrambler takes the scrambled
NRZI data from the data recovery block, descrambles it according to
IEEE 802.3 specifications, aligns the data on the correct 5B word
boundaries, and sends it to the 4B5B decoder.
The algorithm for synchronization of the descrambler is the same as the
algorithm outlined in the IEEE 802.3 specification.
After the descrambler is synchronized, it maintains synchronization as
long as enough descrambled idle pattern ones are detected within a
given interval. To stay in synchronization, the descrambler needs to
detect at least 25 consecutive descrambled idle pattern ones in a 1 ms
interval. If 25 consecutive descrambled idle pattern ones are not
detected within the 1 ms interval, the descrambler goes out of
synchronization and restarts the synchronization process.
The descrambler is disabled for 10BASE-T operation.
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參數描述
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