MPC8540 datasheet(628/1302 Pages) FREESCALE

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

14-2

Freescale Semiconductor

Three-Speed Ethernet Controllers

Figure 14-1. Ethernet Protocol in Relation to the OSI Protocol Stack

Gigabit Ethernet provides the following sublayers:

•

Media access control (MAC) sublayer—The MAC sublayer provides a logical connection

between the MAC and its peer station. Its primary responsibility is to initialize, control, and

manage the connection with the peer station.

•

Reconciliation sublayer—The reconciliation sublayer acts as a command translator. It maps

the terminology and commands used in the MAC layer into electrical formats appropriate

for the physical layer entities.

•

MII (media-independent interface) sublayer—The MII sublayer provides a standard

interface between the MAC layer and the physical layer for 10/100 Mbps operations. It

isolates the MAC layer and the physical layer, enabling the MAC layer to be used with

various implementations of the physical layer.

•

GMII (gigabit media-independent interface) sublayer—The GMII sublayer provides a

standard interface between the MAC layer and the physical layer for 1-Gbps operation. It

isolates the MAC layer and the physical layer, enabling the MAC layer to be used with

various implementations of the physical layer.

•

PCS (physical coding sublayer)—The PCS sublayer is responsible for encoding and

decoding data stream to and from the MAC sublayer. Medium (1000BASEX) 8B/10B

coding is used for fiber. Medium (1000BASET) 8B1Q coding is used for unshielded

twisted pair (UTP).

•

PMA (physical medium attachment) sublayer—The PMA sublayer is responsible for

serializing code groups into a bit stream suitable for serial bit-oriented physical devices

Data Link

Physical

Logical link control (LLC)

Media access control (MAC)

OSI

Reference Model

Layers

LAN

CSMA/CD

Layers

Higher layers

10/100 Mbps

1-Gbps

10/100 Ethernet

Ethernet

Reconciliation

PCS

PMA

PMD

MDI

MII

Physical medium

Reconciliation

PCS

PMA

PMD

MDI

GMII

Physical medium

PHY

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