Aaeon ECM-5716 Series User Manual page 25

User' s Manual
2.3.7.2 Intel 82551ER Ethernet Controller
The Intel® 82551ER Integrated 10BASE-T/100BASE-TX Ethernet Controller expands the
family of Intel® 8255x controllers. As part of Intel' s fourth generation of fully integrated
Fast Ethernet MAC/PHY solutions, the 82551ER is optimized for low-cost, embedded
applications. The 82551ER provides excellent performance with offloading of TCP, UDP
and IP checksums. Its optimized 32-bit interface and efficient scatter-gather bus mastering
capabilities enable the controller to perform high-speed data transfers over the PCI bus.
These capabilities accelerate the processing of high-level commands and operations,
lowering CPU utilization. The device' s architecture enables efficient data flow from the
bus interface unit to the 3KB transmit and receive FIFOs, providing the perfect balance
between the wire and system bus. In addition, multiple priority queues augment Quality of
Service (QoS) performance. The 82551ER is pin-compatible with the Intel® 82559ER
Fast Ethernet controller, and it is layoutcompatible with Intel® 82540 Gigabit Ethernet
controller. Intel-supported 82551ER drivers run on the standard Intel® 82551QM Fast
Ethernet PCI/CardBus Controller, providing OEMs an upgrade path to the 82551QM for
additional features and increased functionality.
2.3.7.3 Intel 82540EM Ethernet Controller (Optional)
The Intel 82540EM Gigabit Ethernet Controller is a single, compact component with an
integrated Gigabit Ethernet Media Access Control (MAC) and physical layer (PHY)
functions. For desktop, workstation and mobile PC network designs with critical space
constrains, the Intel 82540EM allows for a Gigabit Ethernet implementation in a very small
area that is footprint compatible with current 10/100 Mbps Fast Ethernet designs.
The Intel 82540EM integrates Intel' s fourth generation gigabit MAC design with fully
integrated, physical layer circuitry to provide a standard IEEE 802.3 Ethernet interface for
1000BASE-T, 100BASE-TX, and 10BASE-T applications (802.3, 802.3u, and 802.3ab).
The controller is capable of transmitting and receiving data at rates of 1000M bps, 100
Mbps, or 10 Mbps. In addition to managing MAC and PHY layer functions, the controller
provides a 32-bit wide direct Peripheral Component Interconnect (PCI) 2.2 compliant
interface capable of operating at 33 or 66 MHz.
The Intel 82540EM' s on-board System Management Bus (SMB) port enables network
manageability implementations required by information technology personnel for remote
control and alerting via the LAN. With SMB, management packets can be routed to or
from a management processor.
Intelligent Platform Management Interface (IPMI) and Alert Standard Forum (ASF), to be
implemented using the 82540EM. In addition, on chip ASF 1.0 circuitry provides alerting
and remote control capabilities with standardized interfaces.
The 82540EM Gigabit Ethernet Controller architecture is designed to deliver high
performance and PCI bus efficiency. Wide internal data paths eliminate performance
bottlenecks by efficiently handling large address and data words.
controller includes advanced interrupt handling features to limit PCI bus traffic and a PCI
interface that maximizes the use of bursts for efficient PCI bandwidth use. A large 64
KByte on-chip packet buffer maintains superior performance as available PCI bandwidth
changes. In addition, using hardware acceleration, the controller offloads tasks from the
host controller, such as TCP/UDP/IP checksum calculations and TCP segmentation.
The 82540EM is packed in a 15mm2 196-ball grid array and is pin compatible with the
Intel 82551QM 10/100 Mbps Fast Ethernet Multifunction PCI/CardBus Controller.
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The SMB port enables industry standard, such as
The 82540EM