參數(shù)資料
型號(hào)： LQ80221
英文描述： LAN Transceiver
中文描述： 網(wǎng)絡(luò)收發(fā)器
文件頁(yè)數(shù)： 14/91頁(yè)
文件大?。?/td> 907K
代理商： LQ80221
80220/80221
MD400159/E
14
3.4 ENCODER
3.4.1 4B5B Encoder - 100 Mbps
100Base-TX requires that the data be 4B5B encoded.
4B5B coding converts he 4-Bit data nibbles into 5-Bit date
code words. The mapping of the 4B nibbles to the 5B code
words is specified in IEEE 802.3 and shown in Table 2.
The 4B5B encoder on the 80220/80221 takes 4B nibbles
from the controller interface, converts them into 5B words
according to Table 2, and sends the 5B words to the
scrambler. The 4B5B encoder also substitutes the first 8
bits of the preamble with the SSD delimiters (a.k.a. /J/K/
symbols) and adds an ESD delimiter (a.k.a /T/R/ symbols)
to the end of every packet, as defined in IEEE 802.3 and
shown in Figure 2. The 4B5B encoder also fills the period
between packets, called the dle period, with the a continu-
ous stream of idle symbols, as shown in Figure 2.
3.4.2 Manchester Encoder - 10 Mbps
The Manchester encoding process combines clock and
NRZ data such that the first half of the data bit contains the
complement of the data, and the second half of the data bit
contains the true data, as specified in IEEE 802.3. This
guarantees that a transition always occurs n the middle of
the bit cell. The Manchester encoder on the 80220/80221
converts the 10 Mbps NRZ data from the controller inter-
face into a Manchester Encoded data stream for the TP
transmitter and adds a start of idle pulse (SOI) at the end
of the packet as specified in IEEE 802.3 and shown in
Figure 2. The Manchester encoding process is only done
on actual packet data, and he dle period between packets
is not Manchester encoded and filled with link pulses.
Table 2. 4B/5B Symbol Mapping
Symbol
Name
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Description 5B Code
4B Code
Data 0
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
Data 8
Data 9
Data A
Data B
Data C
Data D
Data E
Data F
11110
01001
10100
10101
01010
01011
01110
01111
10010
10011
10110
10111
11010
11011
11100
11101
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
I
Idle
11111
0000
J
K
T
R
H
SSD #1
SSD #2
ESD #1
ESD #2
Halt
11000
10001
01101
00111
00100
0101
0101
0000
0000
Undefined
---
Invalid
codes
All
0000*
others*
* These 5B codes are not used. For decoder, these 5B
codes are decoded to 4B 0000. For encoder, 4B 0000 is
encoded to 5B 11110, as shown in symbol Data 0.
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