HP Workstation x2000 hp workstation x2000 - Technical Reference and Troublesho - Page 57

System Board The Input/Output Controller Hub 2 (82801BA) ICH2 PCI Bus Interface The ICH2 PCI provides the interface to a PCI bus interface operating at 33MHz. This interface implementation is compliant with PCI 2.2 specification, supporting as many as five external PCI masters in addition to the ICH2 requests. The PCI bus can reach a data transfer rate of 133MB/sec. The maximum PCI burst transfer can be between 256 bytes and 4KB. It also supports advanced snooping for PCI master bursting, and provides a prefetch mechanism dedicated for IDE read. For a list of ICH2 interrupts, see the table on page 74. SMBus Controller The System Management (SM) bus is a two-wire serial bus that runs at a maximum of 100kKHz. 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. For a description of the devices on the SMBus, see page 61. For information about the MaxiLife ASIC, see page 63. Low Pin Count Interface The ICH2 implements the LPC interface 1.0 specification. Enhanced USB Controller The USB 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 four stacked connectors on the back panel. These ports are built into the ICH2, as standard USB ports. The ICH2 is USB 1.1 compliant. USB works only if you've enabled the USB interface within the HP Setup program. Currently, only Microsoft Windows 95 SR2.1, Windows 98, and Windows 2000 provide USB support. Chapter 2 57