Chapter 2. System Board Features
USB Interface
Universal serial bus (USB) technology is a standard feature of the computer. The system board provides
the USB interface with one connector. A USB-enabled device can be attached to the connector, and if
that device is a hub, multiple peripheral devices can be attached to the hub and be used by the system.
The USB connector uses Plug and Play technology for installed devices. The speed of the USB is up to
12 Mb/second with a maximum of 255 peripheral devices.
The USB is compliant with
Universal Host Controller Interface Design Guide 1.0. Features provided by
USB technology include:
Support for hot pluggable devices
Support for concurrent operation of multiple devices
Suitable for different device bandwidths
Connections of up to five meters in length from host to hub or hub to hub
Guaranteed bandwidth and low latencies appropriate for specific devices
Wide range of packet sizes
Limited power to hubs
The following table shows the system resources used by the USB interface.
Note: When the computer is started, the resource assignments are subject to change during the
power-on self-test (POST).
At the rear of the computer, one 4-pin connector is provided for the USB interface. For information on the
pin assignments, see “USB Connector” on page 37.
Table 3. System Resource Assignments for USB Interface
System Resource
Assignment
ROM
None
RAM
None
I/O (hex)
Assigned by POST
IRQ
Assigned by POST
DMA
None
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