82562V Datasheet, PDF (14/42 Pages) Intel Corporation – 10/100 Mbps Platform LAN Connect

82562V — Networking Silicon
5.0
Physical Layer Interface Functionality
The 82562V supports a direct glueless interface to all components that comply with the LAN
Connect specification.
5.1
100BASE-TX Mode
5.1.1
100BASE-TX Transmit Blocks
The transmit subsection of the 82562V accepts 3 bit wide data from the LAN Connect unit.
Another subsection passes data unconditionally to the 4B/5B encoder.
The 4B/5B encoder accepts nibble-wide data (4 bits) from the CSMA unit and compiles it into 5-
bit-wide parallel symbols. These symbols are scrambled and serialized into a 125 Mbps bit stream,
converted by the analog transmit driver into a MLT-3 waveform format, and transmitted onto the
Unshielded Twisted Pair (UTP) or Shielded Twisted Pair (STP) wire.
5.1.1.1
100BASE-TX 4B/5B Encoder
The 4B/5B encoder complies with the IEEE 802.3u 100BASE-TX standard. Four bits are encoded
according to the transmit 4B/5B lookup table. The lookup table matches a 5-bit code to each 4-bit
code. Table 5 lists the 4B/5B encoding scheme associated with the given symbol.
Table 5. 4B/5B Encoder
Symbol
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
I
5B Symbol Code
11110
01001
10100
10101
01010
01011
01110
01111
10010
10011
10110
10111
11010
11011
11100
11101
11111
4B Nibble Code
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Inter Packet Idle Symbol (No
4B)
12
Datasheet