參數(shù)資料
型號: 82559
廠商: INTEL CORP
元件分類: 微控制器/微處理器
英文描述: Fast Ethernet Multifunction PCI/CARD bus controller(快速以太網多功能PCI/CARD 總線控制器)
中文描述: 1 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PBGA196
封裝: 15 X 15 MM, BGA-196
文件頁數(shù): 50/124頁
文件大小: 1332K
代理商: 82559
82559 — Networking Silicon
40
Datasheet
5.1.2.2
100BASE-TX Scrambler and MLT-3 Encoder
Data is scrambled in 100BASE-TX in order to reduce electromagnetic emissions during long
transmissions of high-frequency data codes. The scrambler logic accepts 5 bits from the 4B/5B
encoder block and presents the scrambled data to the MLT-3 encoder. The PHY unit implements
the 11-bit stream cipher scrambler as adopted by the ANSI XT3T9.5 committee for UTP operation.
The cipher equation used is:
X[n] = X[n-11] + X[n-9] (mod 2)
The encoder receives the scrambled Non-Return to Zero (NRZ) data stream from the Scrambler
and encodes the stream into MLT-3 for presentation to the driver. MLT-3 is similar to NRZI coding,
but three levels are output instead of two. There are three output levels: positive, negative and zero.
D
11011
1101
E
11100
1110
F
11101
1111
I
11111
Inter Packet Idle Symbol
(No 4B)
J
11000
1st Start of Packet Symbol
0101
K
10001
2nd Start of Packet Symbol
0101
T
01101
1st End of Packet Symbol
R
00111
2nd End of Packet Symbol
and Flow Control
V
00000
INVALID
V
00001
INVALID
V
00010
INVALID
V
00011
INVALID
H
00100
INVALID
V
00101
INVALID
V
00110
INVALID
V
01000
INVALID
V
01100
INVALID
V
10000
PHY based Flow Control
V
11001
INVALID
Table 2. 4B/5B Encoder
Symbol
5B Symbol Code
4B Nibble Code
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