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The Input/Output Controller Hub (82801AA)

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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.

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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.

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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.

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The ICH implements the LPC interface 1.0 specification.

M”wp”rts caJ K½”½““t 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 l program. Currently, only the Microsoft Windows 95 and Windows 98 operating systems provide support for the USB.

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HP KAYAK XU800 manual QKP Ixtrt, QKP XKQ JQt, AUJt, ½ K½tprt