80220 datasheet(10/91 Pages) LSI

10 / 91 page

80220/80221

MD400159/E

3.0 FUNCTIONAL DESCRIPTION

3.1 GENERAL

The 80220/80221 is a complete 100/10 Mbps Ethernet

Media Interface IC.

The 80220/80221 has ten main

sections: controller interface, encoder, decoder, scram-

bler, descrambler, clock and data recovery, twisted pair

transmitter, twisted pair receiver,

MI serial port, and

AutoNegotiation. A block diagram is shown in Figure 1.

The 80220/80221 can operate as a 100Base-TX device

(hereafter referred to as 100 Mbps mode) or as a 10Base-

T device (hereafter referred to as 10 Mbps mode). The

difference between the 100 Mbps mode and the 10 Mbps

mode is data rate, signalling protocol, and allowed wiring.

The 100 Mbps mode uses two pairs of category 5 or better

UTP or STP twisted pair cable with 4B5B encoded,

scrambled, and MLT-3 coded 62.5 MHz ternary data to

achieve a thruput of 100 Mbps. The 10 Mbps mode uses

two pairs of category 3 or better UTP or STP twisted pair

cable with Manchester encoded, 10 MHz binary data to

achieve a 10 Mbps thruput. The data symbol format on the

twisted pair cable for the 100 and 10 Mbps modes are

defined in IEEE 802.3 specifications and shown in Figure

On the transmit side for 100 Mbps operation, data is

received on the controller interface from an external

Ethernet controller per the format shown in Figure 3. The

data is then sent to the 4B5B encoder for formatting. The

encoded data is then sent to the scrambler. The scrambled

and encoded data is then sent to the TP transmitter. The

TP transmitter converts the encoded and scrambled data

into MLT-3 ternary format, preshapes the output, and

drives the twisted pair cable.

Figure 2. Twisted Pair Frame Format

PREAMBLE

SFD

LLC DATA

FCS

INTERFRAME

GAP

ETHERNET MAC FRAME

INTERFRAME

GAP

SSD

PREAMBLE

SFD

LLC DATA

FCS

IDLE

100 BASE-TX TP DATA SYMBOLS

IDLE

ESD

= [ 1 1 1 1 ...]

= [ 0 1 1 0 1 0 0 1 1 1 ]

= [ DATA ]

= [ 1 1 ]

= [ 1 0 1 0 ...] 62 BITS LONG

= [ 1 1 0 0 0 1 0 0 0 1 ]

ESD

DA, SA, LN, LLC DATA, FCS

SSD

PREAMBLE

SFD

IDLE

BEFORE / AFTER

4B5B ENCODING,

SCRAMBLING, AND

MLT3 CODING

PREAMBLE

SFD

LLC DATA

FCS

IDLE

10 BASE-T TP DATA SYMBOLS

IDLE

SOI

= [ NO TRANSITIONS ]

= [ 1 1 ] WITH NO MID BIT

TRANSITION

= [ DATA ]

= [ 1 1 ]

= [ 1 0 1 0 ... ] 62 BITS LONG

SOI

DA, SA, LN, LLC DATA, FCS

SFD

PREAMBLE

IDLE

BEFORE / AFTER

MANCHESTER

ENCODING

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