參數(shù)資料
型號(hào)： AM79C864AKC
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： Physical Layer Controller With Scrambler (PLC-S)
中文描述： 0 CHANNEL(S), 100M bps, FDDI CONTROLLER, PQFP120
封裝： PLASTIC, QFP-120
文件頁(yè)數(shù)： 38/51頁(yè)
文件大?。?/td> 271K
代理商： AM79C864AKC
AMD
P R E L I M I N A R Y
3-40
The SUPERNET 2 Family for FDDI 1994 Data Book
Table 15. 4B/5B Decoding of Data
Symbol
Encoded Input
Decoded Output
Q
0 0 0 0 0
1 0 0 0 0
I
1 1 1 1 1
1 0 1 1 1
H
0 0 1 0 0
1 0 1 0 0
J
1 1 0 0 0
1 1 1 0 0
K
1 0 0 0 1
1 0 0 1 1
T
0 1 1 0 1
1 1 1 0 1
R
0 0 1 1 1
1 0 0 0 1
S
1 1 0 0 1
1 1 0 0 1
H
0 0 0 0 1
1 0 1 0 0
H
0 0 0 1 0
1 0 1 0 0
V
0 0 0 1 1
1 1 0 0 0
V
0 0 1 0 1
1 1 0 0 0
V
0 0 1 1 0
1 1 0 0 0
H
0 1 0 0 0
1 0 1 0 0
V
0 1 1 0 0
1 1 0 0 0
H
1 0 0 0 0
1 0 1 0 0
0
1 1 1 1 0
0 0 0 0 0
1
0 1 0 0 1
0 0 0 0 1
2
1 0 1 0 0
0 0 0 1 0
3
1 0 1 0 1
0 0 0 1 1
4
0 1 0 1 0
0 0 1 0 0
5
0 1 0 1 1
0 0 1 0 1
6
0 1 1 1 0
0 0 1 1 0
7
0 1 1 1 1
0 0 1 1 1
8
1 0 0 1 0
0 1 0 0 0
9
1 0 0 1 1
0 1 0 0 1
A
1 0 1 1 0
0 1 0 1 0
B
1 0 1 1 1
0 1 0 1 1
C
1 1 0 1 0
0 1 1 0 0
D
1 1 0 1 1
0 1 1 0 1
E
1 1 1 0 0
0 1 1 1 0
F
1 1 1 0 1
0 1 1 1 1
Encoder
The Encoder performs the 4B/5B encoding of data sym-
bols to be transmitted over the physical medium. The
four bits of data and one control bit from the MAC are
encoded into a unique five bit symbol which is sent to the
PDT. Although the Encoder operates on symbol pairs,
each symbol is encoded independently of the other.
The symbol encoding is defined in Table 16.
Table 16. 4B/5B Encoding of Data
Symbol
Data Input
Encoded Output
Q
1 0 0 0 0
0 0 0 0 0
I
1 0 1 1 1
1 1 1 1 1
H
1 0 1 0 0
0 0 1 0 0
J
1 1 1 0 0
1 1 0 0 0
K
1 0 0 1 1
1 0 0 0 1
T
1 1 1 0 1
0 1 1 0 1
R
1 0 0 0 1
0 0 1 1 1
S
1 1 0 0 1
1 1 0 0 1
INV
1 1 1 1 0
1 1 1 1 1
INV
1 0 0 10
1 1 1 1 1
INV
1 0 1 0 1
1 1 1 1 1
INV
1 0 1 1 0
1 1 1 1 1
INV
1 1 1 1 1
1 1 1 1 1
INV
1 1 0 0 0
1 1 1 1 1
INV
1 1 0 1 0
1 1 1 1 1
INV
1 1 0 1 1
1 1 1 1 1
0
0 0 0 0 0
1 1 1 1 0
1
0 0 0 0 1
0 1 0 0 1
2
0 0 0 1 0
1 0 1 0 0
3
0 0 0 1 1
1 0 1 0 1
4
0 0 1 0 0
0 1 0 1 0
5
0 0 1 0 1
0 1 0 1 1
6
0 0 1 1 0
0 1 1 1 0
7
0 0 1 1 1
0 1 1 1 1
8
0 1 0 0 0
1 0 0 1 0
9
0 1 0 0 1
1 0 0 1 1
A
0 1 0 1 0
1 0 1 1 0
B
0 1 0 1 1
1 0 1 1 1
C
0 1 1 0 0
1 1 0 1 0
D
0 1 1 0 1
1 1 0 1 1
E
0 1 1 1 0
1 1 1 0 0
F
0 1 1 1 1
1 1 1 0 1
STREAM CIPHER SCRAMBLER
Background
A popular implementation of FDDI is the replacement of
fiber with unshielded twisted pair wire (UTP). When a
digital signal is transmitted over copper wire it radiates
radio frequency (rf) energy. FDDI encoded data has re-
petitive patterns which result in peaks in the rf spectrum
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