MSC8113 Reference Manual, Rev. 0
Freescale Semiconductor
25-1
Ethernet Controller
25
The IEEE Std. 802.3 standard specifies a local area network (LAN) protocol that uses
carrier-sense multiple access with collision detection (CSMA/CD). Ethernet is one of the
common implementations of this standard and is a simple, cost-effective option for backbone and
server connectivity. Because Ethernet is very close to other IEEE Std. 802.3 protocols and
because they can all coexist on the same LAN, this chapter uses the term Ethernet to indicate the
IEEE Std. 802.3 interface unless otherwise noted. The 10/100 Ethernet supplement to the
standard increases Ethernet speed from 10 to 100 megabits per second (Mbps). Another
supplement defines the requirements for a media-independent interface (MII) that can support
various physical implementations. Other protocols developed modifications to this basic
interface, including the reduced media-independent interface (RMII) and the serial
media-independent interface (SMII). The MSC8113 Ethernet controller supports MII, RMII, and
SMII for the 10/100 Ethernet rate.
25.1
Ethernet Basics
The Ethernet protocol implements the bottom two layers of the open systems interconnection
(OSI) 7-layer model, which are the data link and physical sublayers. Figure 25-1 depicts the
typical Ethernet protocol stack and the relationship to the OSI model.
Figure 25-1. Ethernet Protocol 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
PHY
Содержание MSC8113
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