HP Kayak XU 04xx HP Kayak XU PC Workstation Technical Reference Manual Hardwar - Page 21
The PIIX4, PCI/ISA Bridge Chip (82371SB)
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2 System Board Chip-Set Main Memory Controller The main memory controller supports four DIMM slots. Each slot can host a 168-pin unbuffered SDRAM module, running at 66 MHz, for a total of up to 512 MB of dynamic random access memory (ECC SDRAM). (Refer to "Main Memory" on page 19, for more detail on the main memory.) The PIIX4, PCI/ISA Bridge Chip (82371SB) The PIIX4 ("PCI-to-ISA/IDE XCELERATOR") chip is encapsulated in a Ball Grid Array (BGA) package. PCI Bus Interface This part of the chip is responsible for transferring data between the PCI bus and the ISA expansion bus. It performs PCI-to-ISA, and ISA-to-PCI bus cycle translation. It supports the Plug-and-Play mechanism. Data buffers are provided, to isolate the PCI and ISA buses. The interface complies with the PCI 2.1 specification. ISA Bus Interface As well as accepting cycles from the PCI bus interface, and translating them for the ISA bus, the ISA bus interface also requests the PCI master bridge to generate PCI cycles on behalf of a DMA or ISA master. The ISA bus interface contains a standard ISA bus controller and data buffering logic. It can directly support six ISA slots without external data or address buffering. SMBus Controller The System Management (SM) bus is a two-wire serial bus provided by the PIIX4 controller. It runs at a maximum of 16 kHz. The bus monitors some of the hardware functions of the main board, both during boot-up and run-time. All accesses to the SM bus are handled by the main processor, via the PIIX4 SM bus registers. IDE Controller The PCI master/slave IDE controller, supporting two devices on one channel, is described on page 21. USB Controller The PCI USB controller, supporting two connectors, is described on page 22. It is USB 1.0 compliant. 13
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