MPC8540 datasheet(1141/1302 Pages) FREESCALE

1141 / 1302 page

MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

Freescale Semiconductor

21-1

Chapter 21

10/100 Fast Ethernet Controller

The MPC8540 provides a 10/100 fast Ethernet controller (FEC) operating at 10 to 100 megabits

per second (Mbps) that can be used as a device debug and maintenance port. The three-speed

(10/100/1Gb) Ethernet controller (TSEC) is separate from this 10/100 Ethernet controller, and is

described in Chapter 14, “Three-Speed Ethernet Controllers.”

21.1 Introduction

The 10/100 Ethernet standard supports the IEEE 802.3 Ethernet frame format, backward

compatibility for installed media, and the use of full- or half-duplex CSMA/CD.

The Ethernet protocol implements the bottom two layers of the open systems interconnection

(OSI) 7-layer model, that is, the data link and physical layers. Figure 21-1 depicts the typical

Ethernet protocol stack and the relationship to the OSI model.

Figure 21-1. 10/100 Fast Ethernet Controller in Relation to the OSI Protocol Stack

Data Link

Physical

Logical link control (LLC)

Media access control (MAC)

OSI

Reference Model

Layers

LAN

CSMA/CD

Layers

Higher layers

10/100 Mbps

10/100 Ethernet

Reconciliation

PCS

PMA

PMD

MDI

MII

Physical medium

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