HP KAYAK XU800 ICH Architecture, SMBus Controller, ICH PCI Bus Interface, receive the adequate bandwidths, into the ICH, as standard USB ports

2 System Board

The Input/Output Controller Hub (82801AA)

ICH Architecture	The ICH interface architecture ensures that the I/O subsystems, both PCI
	and the integrated input/output features (for example: IDE, AC’97 and USB)
	receive the adequate bandwidths.
	To achieve this, by placing the I/O bridge directly on the ICH interface, and
	no longer on the PCI bus, the ICH architecture ensures that both the input/
	output functions integrated into the ICH and the PCI peripherals obtain the
	bandwidth necessary for peak performance.
ICH PCI Bus Interface	The ICH PCI provides the interface to a PCI bus interface operating at
	33 MHz. This interface implementation is compliant with PCI Rev 2.2
	Specification, supporting up to six external PCI masters in addition to the
	ICH requests and AC’97 controller. The PCI bus can reach a data transfer
	rate of 133 MBytes/sec. The maximum PCI burst transfer can be between
	256 bytes and 4 KB. It also supports advanced snooping for PCI master
	bursting, and provides a pre-fetch mechanism dedicated for IDE read.
	Refer to the table page 68 for ICH interrupts.
SMBus Controller	The System Management (SM) bus is a two-wire serial bus which runs at a
	maximum of (100 kHz). The SMBus Host interface allows the processor to
	communicate with SMBus slaves and an SMBus Slave interface that allows
	external masters to activate power management events. The bus connects
	to sensor devices that monitor some of the hardware functions of the system
	board, both during system boot and run-time.
	Refer to page 55 for a description of the devices on the SMBus, or to page 58
	for information on the MaxiLife ASIC.
Low Pin Count Interface	The ICH implements the LPC interface 1.0 specification.
Enhanced USB Controller	The USB (Universal Serial Bus) controller provides enhanced support for
	the Universal Host Controller Interface (UHCI). This includes support that
	allows legacy software to use a USB-based keyboard and mouse. The USB
	supports two stacked connectors on the back panel. These ports are built
	into the ICH, as standard USB ports.
	The ICH is USB revision 1.1 compliant.
	USB works only if the USB interface has been enabled within the HP Setup
	program. Currently, only the Microsoft Windows 95 and Windows 98
	operating systems provide support for the USB.

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