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Description 13
NOTE
All memory components used with the server board should comply with the
following PC SDRAM specifications (see Chapter 13 in the Intel
®
ISP1100
Internet Server Technical Product Specification for information about how to
obtain these specifications):
• PC SDRAM Specification (memory component specific)
• PC Unbuffered SDRAM Specifications
• PC Serial Presence Detection Specification
Processors with 100 MHz host bus speed must be paired only with 100 MHz
SDRAM. Processors with 66 MHz host bus speed can be paired with either
66 MHz or 100 MHz SDRAM.
Chipset
The Intel 82440BX AGPset consists of the Intel 82443BX PAC and the Intel 82371EB PIIX4E
bridge chip. The PAC provides an optimized DRAM controller. The PAC’s accelerated graphics
port (AGP) interface is not used. The I
/O subsystem of the 82440BX is based on the PIIX4E,
which is a highly integrated PCI ISA IDE Xcelerator Bridge.
Universal Serial Bus
The server board has two universal serial bus (USB) ports that accommodate one USB peripheral
connected to each port. For more than two USB devices, an external hub can be connected to either
port. The two USB ports are implemented with stacked back panel I/O connectors. The server
board fully supports UHCI and uses UHCI-compatible software drivers. See Chapter 13 in the Intel
ISP1100 Internet Server Technical Product Specification for information about the USB and UHCI
specifications.
The USB includes the following capabilities:
• Self-identifying peripherals that can be plugged in while the computer is running.
• Automatic mapping of function to driver and configuration.
• Support for synchronous and asynchronous transfer types over the same set of wires.
• Guaranteed bandwidth and low latencies appropriate for telephony, audio, and other
applications.
• Error-handling and fault-recovery mechanisms built into the protocol.
NOTE
Computer systems that have an unshielded cable attached to a USB port may
not meet FCC Class B requirements; even if no device or a low-speed USB
device is attached to the cable. Use shielded cable that meets the
requirements for full-speed devices.