MPC8540 datasheet(627/1302 Pages) FREESCALE

627 / 1302 page

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

Freescale Semiconductor

14-1

Chapter 14

Three-Speed Ethernet Controllers

This chapter describes the two three-speed Ethernet controllers of the MPC8540. The two

controllers are referenced as TSEC1 and TSEC2. Note that this chapter does not include the

description of the separate 10/100 Ethernet controller (FEC) on the MPC8540.

14.1 Introduction

The Ethernet IEEE 802.3 protocol is widely used on LANs that are based on the carrier-sense

multiple access/collision detect (CSMA/CD) approach. Because Ethernet and IEEE 802.3

protocols are similar and can coexist on the same LAN, both are referred to as Ethernet in this

manual, unless otherwise noted. 10/100 Ethernet provides increased Ethernet speed from 10 to 100

megabits per second (Mbps) and provides a simple, cost-effective option for backbone and server

connectivity. This three-speed Ethernet controller (TSEC) also implements a gigabit Ethernet

protocol, which builds on top of the Ethernet protocol, but increases speed tenfold over 10/100

Ethernet to 1000 Mbps, or one gigabit per second (Gbps).

Gigabit Ethernet looks identical to Ethernet from the data link layer upward but it uses the ANSI

X3T11 FiberChannel FC-0 (interface and media) and FC-1 (encode/decode) for the PHY Layer.

In this manner, the standard takes advantage of the existing high-speed physical interface

technology of FiberChannel while maintaining 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 14-1 shows the typical

Ethernet protocol stack and the relationship to the OSI model.

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