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38 Intel Server Board S845WD1-E Product Guide
Video Memory Interface
The memory controller subsystem of the Rage XL arbitrates requests from direct memory interface,
the VGA graphics controller, the drawing coprocessor, the display controller, the video scalar, and
hardware cursor. Requests are serviced in a manner that ensures display integrity and maximum
CPU/coprocessor drawing performance.
The S845WD1-E supports a 2 MB (512Kx32bitx4 Banks) SDRAM device for video memory.
Network Interface Controller (NIC)
The S845WD1-E server board supports two 10Base-T/100Base-TX Network Interface Controllers
(NICs) based on the Intel 82550PM NIC. The 82550PM is a highly integrated PCI LAN controller
in a thin BGA 15mm package. The controller’s baseline functionality is equivalent to that of the
Intel
®
82559, with the addition of Alert-on-LAN functionality. The S845WD1-E server board
supports independent disabling of the two NIC controllers using the BIOS Setup menu.
The 82550PM supports the following features:
• Glueless 32-bit PCI, CardBus master interface (Direct Drive of Bus), compatible with PCI local
Bus Specification, Revision 2.2.
• Integrated IEEE 802.3 10Base-T and 100Base-TX compatible PHY.
• IEEE 820.3u auto-negotiation support.
• Full duplex support at both 10 Mbps and 100 Mbps operation.
• Integrated UNDI ROM support.
• MDI/MDI-X and HWI support.
• Low power +3.3 V device.
NIC Connector and Status LEDs
The 82550 drives two LEDs located on each network interface connector. The amber LED
indicates network connection when on, and transmit/receive activity when blinking. The yellow
LED indicates 100-Mbps operation when lit, and 10-Mbps when off.