LM3S6422 Datasheet, PDF (473/609 Pages) Texas Instruments – Stellaris® LM3S6422 Microcontroller

Stellaris^® LM3S6422 Microcontroller
13
13.1
Ethernet Controller
The Stellaris^® Ethernet Controller consists of a fully integrated media access controller (MAC) and
network physical (PHY) interface. The Ethernet Controller conforms to IEEE 802.3 specifications
and fully supports 10BASE-T and 100BASE-TX standards.
The Stellaris Ethernet Controller module has the following features:
■ Conforms to the IEEE 802.3-2002 specification
– 10BASE-T/100BASE-TX IEEE-802.3 compliant. Requires only a dual 1:1 isolation transformer
interface to the line
– 10BASE-T/100BASE-TX ENDEC, 100BASE-TX scrambler/descrambler
– Full-featured auto-negotiation
■ Multiple operational modes
– Full- and half-duplex 100 Mbps
– Full- and half-duplex 10 Mbps
– Power-saving and power-down modes
■ Highly configurable
– Programmable MAC address
– LED activity selection
– Promiscuous mode support
– CRC error-rejection control
– User-configurable interrupts
■ Physical media manipulation
– Automatic MDI/MDI-X cross-over correction
– Register-programmable transmit amplitude
– Automatic polarity correction and 10BASE-T signal reception
Block Diagram
As shown in Figure 13-1 on page 474, the Ethernet Controller is functionally divided into two layers:
the Media Access Controller (MAC) layer and the Network Physical (PHY) layer. These layers
correspond to the OSI model layers 2 and 1. The CPU accesses the Ethernet Controller via the
MAC layer. The MAC layer provides transmit and receive processing for Ethernet frames. The MAC
layer also provides the interface to the PHY layer via an internal Media Independent Interface (MII).
The PHY layer communicates with the Ethernet bus.
June 18, 2012
473
Texas Instruments-Production Data