參數(shù)資料
型號: L80227
廠商: LSI CORP
元件分類: 網(wǎng)絡(luò)接口
英文描述: 10BASE-T/100BASE-TX Ethernet Physical Layer Device (PHY)(10BASE-T/100BASE-TX 以太網(wǎng)物理層處理器)
中文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封裝: LQFP-64
文件頁數(shù): 33/158頁
文件大?。?/td> 1084K
代理商: L80227
Draft 6/5/00
Block Diagram Description
2-13
Copyright 1999 by LSI Logic Corporation. All rights reserved.
2.3.3 Encoder
This section describes the 4B5B encoder, which is used in 100 Mbits/s
operation. It also describes the Manchester Encoder, used in 10BASE-T
operation.
2.3.3.1 4B5B Encoder (100 Mbits/s)
100BASE-TX operation requires that the data be 4B5B encoded. The
4B5B Encoder block shown in
Figure 2.1
converts the four-bit data
nibbles into five-bit data words. The mapping of the 4B nibbles to 5B
codewords is specified in IEEE 802.3 and is shown in
Table 2.5
.
Table 2.5
4B/5B Symbol Mapping
Symbol Name
Description
5B Code
4B Code
0
Data 0
11110
0000
1
Data 1
01001
0001
2
Data 2
10100
0010
3
Data 3
10101
0011
4
Data 4
01010
0100
5
Data 5
01011
0101
6
Data 6
01110
0110
7
Data 7
01111
0111
8
Data 8
10010
1000
9
Data 9
10011
1001
A
Data A
10110
1010
B
Data B
10111
1011
C
Data C
11010
1100
D
Data D
11011
1101
E
Data E
11100
1110
F
Data F
11101
1111
I
Idle
11111
0000
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參數(shù)描述
L80227/B 制造商:LSI Corporation 功能描述: 制造商:LSI Corporation 功能描述:L80227/B
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L80227-I-LEADFREE 制造商:LSI Corporation 功能描述:796000124413