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Features
System Board Parts
Microprocessor
The AP55CS system board uses an Intel Pentium (3.3V) or a Cyrix
6x86 processor running at speeds of 75, 90, 100, 120, 133, 150 or
166 MHz. Chapter 2 gives details on how to upgrade the Pentium
processor.
ASICs
The three ASICs (application-specific integrated circuits) onboard are
the SiS5511, SiS5512, and SiS85C513. The SiS5511 serves as the
PCI/ISA cache memory controller that supports write-back and write-
through cache modes. It features a high-performance arbiter with
four PCI masters and a rotating priority mechanism. It also acts as a
PCI bridge that translates CPU cycles into PCI cycles.
The SiS5512 functions as a PCI local bus data buffer that offers 64-
bit DRAM and 32-bit PCI bus interfaces to support the 64-bit Pentium
processor data bus.
The SiS85C513 acts as the ISA/PCI bus bridge that translates the
PCI bus cycles into ISA bus cycles or vice-versa. It also functions as
an ISA arbiter, DMA cycle and interrupt controller.
1-4
User's Guide
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