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參數(shù)資料
| 型號： | L84225 |
| 英文描述： | L84225 100BaseTX/FX/10BaseT Physical Layer Device technical manual 4/02 |
| 中文描述： | L84225 100BaseTX/FX/10BaseT物理層設(shè)備的技術(shù)手冊，4月2日 |
| 文件頁數(shù)： | 15/118頁 |
| 文件大小： | 890K |
| 代理商： | L84225 |
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Functional Description
Copyright 1999-2002 by LSI Logic Corporation. All rights reserved.
15 of 118
April, 2002
For FX operation, the encoded data is converted to NRZI format, which
drives a binary (two-level) signal to the fiber transceiver interface (PMD).
On the receive side for 100BaseTX operation, the TX receiver removes
any high frequency noise from the input, equalizes the input signal to
compensate for the low pass effects of the cable, and qualifies the data
with a squelch algorithm. The TX receiver then converts the data from
MLT3 coded twisted pair levels to internal digital levels. The output of the
receiver then goes to a clock and data recovery block which recovers a
clock from the incoming data, uses the clock to latch in valid data into
the device, and converts the data back to NRZ data. The data is then
unscrambled and decoded by the 4B5B decoder and descrambler,
respectively, and output to an external Ethernet controller by the
controller interface. 100Base FX receiver operation is the same as TX
except there is no equalizer, descrambler, and has a separate ECL
receiver.
10 Mbps operation is similar to the 100 Mbps operation, except:
There is no scrambler/descrambler.
The encoder/decoder is Manchester instead of 4B5B.
The data rate is 10 Mbps instead of 100 Mbps.
The twisted pair symbol data is two level Manchester instead of
ternary MLT3.
The FX interface is disabled for 10 Mbps operation.
The AutoNegotiation block automatically configures each channel for
either 100BaseTX or 10BaseT, and either Full or Half Duplex operation.
This configuration is based on the capabilities selected for the channel
and capabilities detected from the remote device connected to the
channel.
The Management Interface (the MI serial port) is a two-pin bidirectional
link through which configuration inputs can be set and channel status
outputs read.
Each block plus the operating modes are described in more detail in the
following sections. Since the L84225 can operate as a 100BaseFX,
100BaseTX, or 10BaseT device, each of the following sections describes
the performance in both 100 and 10 Mbps modes.
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相關(guān)代理商/技術(shù)參數(shù) |
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| L84225/B1 | 制造商:LSI Corporation 功能描述: |
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| L8446-06 | 制造商:HAMAMATSU 制造商全稱:Hamamatsu Corporation 功能描述:CW LASER DIODES |
| L8446-07 | 制造商:HAMAMATSU 制造商全稱:Hamamatsu Corporation 功能描述:CW LASER DIODES |
| L8446-41 | 制造商:HAMAMATSU 制造商全稱:Hamamatsu Corporation 功能描述:CW LASER DIODES |
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