參數(shù)資料
型號: KSZ8999I
廠商: Micrel Inc
文件頁數(shù): 44/52頁
文件大小: 0K
描述: IC SWITCH 9-PORT 10/100 208PQFP
標準包裝: 24
系列: *
類型: *
應用: *
安裝類型: 表面貼裝
封裝/外殼: 208-MQFP,208-PQFP
供應商設備封裝: 208-PQFP(28x28)
包裝: 管件
產(chǎn)品目錄頁面: 1081 (CN2011-ZH PDF)
配用: 576-1644-ND - BOARD EVALUATION FOR KSZ8999
其它名稱: 576-2128
KSZ8999I-ND
January 2005
49
KS8999
Micrel
4B/5B Coding
In 100BaseTX and 100BaseFX the data and frame control are encoded in the transmitter (and decoded in the receiver) using
a 4B/5B code. The extra code space is required to encode extra control (frame delineation) points. It is also used to reduce
run length as well as supply sufficient transitions for clock recovery. The table below provides the translation for the 4B/5B
coding.
Code Type
4B Code
5B Code
Value
Data
0000
11110
Data value 0
0001
01001
Data value 1
0010
10100
Data value 2
0011
10101
Data value 3
0100
01010
Data value 4
0101
01011
Data value 5
0110
01110
Data value 6
0111
01111
Data value 7
1000
10010
Data value 8
1001
10011
Data value 9
1010
10110
Data value A
1011
10111
Data value B
1100
11010
Data value C
1101
11011
Data value D
1110
11100
Data value E
1111
11101
Data value F
Control
Not defined
11111
Idle
0101
11000
Start delimiter part 1
0101
10001
Start delimiter part 2
Not defined
01101
End delimiter part 1
Not defined
00111
End delimiter part 2
Not defined
00100
Transmit error
Invalid
Not defined
00000
Invalid code
Not defined
00001
Invalid code
Not defined
00010
Invalid code
Not defined
00011
Invalid code
Not defined
00101
Invalid code
Not defined
00110
Invalid code
Not defined
01000
Invalid code
Not defined
01100
Invalid code
Not defined
10000
Invalid code
Not defined
11001
Invalid code
Table 13. 4B/5B Coding
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