2 System Board - (SiS Chipset) (Part Number: D4051-63001)

SiS Chipset

SiS Chipset

The SiS chipset consists of three chips, each encapsulated in a 208-pin plastic quad flat pack (PQFP) package, that interface between the three main buses (the Host bus, the PCI bus and the ISA bus):

•The PCMC chip (SiS 5511) is a combined PL/PCI bridge and cache controller and main memory controller and PCI arbiter.

•The PLDB chip (SiS 5512) provides the PCI local data buffer/path.

•The PSIO chip (SiS 5513) provides the PCI/ISA bridge, responsible for transferring data between the PCI bus and the ISA bus, and also contains the IDE controller.

The block diagram on the following page, gives an overview of the computer’s structure. The SiS chipset is described in more detail later on in this chapter.

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