
7 at• J½p
The Input/Output Controller Hub (82801AA)
QKP Ixtrt | 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. |
QKP XKQ JQ”t | 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 |
| Refer to the table page 68 for ICH interrupts. |
aUJt | The System Management (SM) bus is 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 |
| Refer to page 55 for a description of the devices on the SMBus, or to page 58 |
| for information on the MaxiLife ASIC. |
T½” K½”tprt | 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
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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