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LAN83C183

10/100 Mbps TX/FX/10BT Fast Ethernet Physical Layer Device (PHY)

SMSC -> Microchip 

Chapter 1

LAN83C183

Functional Description

This chapter is a functional description of the PHY device with the following sections:

• Section 1.1, “Overview”

• Section 1.2, “Block Diagram Description”

• Section 1.3, “Start of Packet”

• Section 1.4, “End of Packet”

• Section 1.5, “Full/Half Duplex Mode”

• Section 1.6, “Repeater Mode”

• Section 1.7, “10/100 Mbits/s Selection”

• Section 1.8, “Jabber”

• Section 1.9, “Automatic Jam”

• Section 1.10, “Reset”

• Section 1.11, “Powerdown”

• Section 1.12, “Receive Polarity Correction”

1.1 OVERVIEW

This section gives a brief overview of the device functional operation. The

LAN83C183 is a complete 10/100 Mbits/s Ethernet Media Interface IC. A block

diagram is shown in Figure 1.1.

1.1.1 Channel Operation

The PHY operates in the 100BASE-TX or 100BASE-FX modes at 100 Mbits/s, or in

the 10BASE-T mode at 10 Mbits/s. The 100 Mbits/s modes and the 10 Mbits/s mode

differ in data rate, signaling protocol, and allowed wiring as follows:

• 100BASE-TX mode uses two pairs of category 5 or better UTP or STP twisted-

pair cable with 4B5B encoded, scrambled, and MLT3 coded 62.5-MHz ternary

data to achieve a throughput of 100 Mbits/s.

• The 100BASE-FX mode uses two fiber cables with 4B5B encoded, 125-MHz

binary data to achieve a throughput of 100 Mbits/s.

• 10 Mbits/s 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 Mbits/s

throughput

The data symbol format on the twisted-pair cable for the 100 and 10 Mbits/s modes

is defined in IEEE 802.3 specifications and shown in Figure 1.2.

1.1.2 Data Paths

In each device, there is a transmit data path and a receive data path associated with

each PHY channel. The transmit data path is from the Controller Interface to the

twisted-pair transmitter. The receive data path is from the twisted-pair receiver to the

Controller Interface.

SMSC DS – LAN83C183

11

Rev. 12/14/2000

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