CHAPTER 2 –Ha
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The Universal Serial Bus (USB) that allows plug and play computer peripherals such as
keyboard, mouse, joystick, scanner, printer, modem/ISDN, CD-ROM and floppy disk drive to
be automatically detected when they are attached physically without having to install drivers or
reboot.
The USB connectors allow any of several USB devices to be attached to the computer.
Typically, the device driver for USB devices is managed by the operating system. However,
because keyboard and mouse support may be needed in the Setup program before the operating
system boots, the BIOS supports USB keyboards and mice.
The CPU card has four USB ports; one USB peripheral can be connected to each port.
For more than four USB devices, an external hub can be connected to either port. The CPU card
fully supports the universal host controller interface (UHCI) and uses UHCI-compatible
software drivers.
USB features includes:
Self-identifying peripherals that can be plugged in while the computer is running
Automatic mapping of function to driver and configuration
Support for isochronous and asynchronous transfer types over the same set of wires
Support for up to 127 physical devices
Guaranteed bandwidth and low latencies appropriate for telephony, audio and other
applications
Error-handling and fault-recovery mechanisms built into the protocol
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