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): 14/118頁
文件大?。?/td> 890K
代理商: L84225
14 of 118
April, 2002
L84225 Quad 100BaseTX/FX/10BaseT Phys. Layer Device - Technical Manual
Copyright 1999-2002 by LSI Logic Corporation. All rights reserved.
Figure 2
Frame Format
On the transmit side for 100 Mbps operation, data is received on the
controller interface from an external Ethernet controller per the format
shown in
Figure 3
. The data is sent to the encoder for formatting. For TX
operation, the encoded data is sent to the scrambler. The encoded and
scrambled data is then sent to the TX transmitter. The transmitter
converts the encoded and scrambled data into MLT3 ternary format. The
transmitter then pre-shapes the output and drives the twisted pair cable.
Interframe
GAP
PREAMBLE
SFD
DA
SA
LN
LLC Data
FCS
Interframe
GAP
Ethernet MAC Frame
SSD
DA
SA
LN
LLC DATA
FCS
100 Base-TX Data Symbols
IDLE
PREAMBLE
SFD
ESD
IDLE
IDLE =
SSD =
PREAMBLE =
SFD =
DA, SA, LN, LLC DATA, FCS =
ESD =
[ 1 1 1 1 ...]
[ 1 1 0 0 0 1 0 0 0 1 ]
[ 1 0 1 0 ...] 62 Bits Long
[ 1 1 ]
[ DATA ]
[ 0 1 1 0 1 0 0 1 1 1 ]
Before/After
4B5B Encoding,
Scrambling, and
MLT3 Coding
DA
SA
LN
LLC DATA
FCS
10 Base-T Data Symbols
IDLE
PREAMBLE
SFD
SOI
IDLE
IDLE =
PREAMBLE =
SFD =
DA, SA, LN, LLC DATA, FCS =
[ NoTransitions ]
[ 1 0 1 0 ...] 62 Bits Long
[ 1 1 ]
[ DATA ]
[ 1 1 ] With No MID Bit
Transition
SOI =
Before/After
Manchester
Encoding
SSD
DA
SA
LN
LLC DATA
FCS
100 Base-FX Data Symbols
IDLE
PREAMBLE
SFD
ESD
IDLE
IDLE =
SSD =
PREAMBLE =
SFD =
DA, SA, LN, LLC DATA, FCS =
ESD =
[ 1 1 1 1 ...]
[ 1 1 0 0 0 1 0 0 0 1 ]
[ 1 0 1 0 ...] 62 Bits Long
[ 1 1 ]
[ DATA ]
[ 0 1 1 0 1 0 0 1 1 1 ]
Before/After
4B5B Encoding
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