62
3 System Board (P/Ns D3657-63001 and D3661-63001)
Principal Components and Features
Principal Components and Features
PCI Chipset
The PCI chipset consists of four chips that interface between the three main
buses (the processor’s local (PL) bus, the PCI bus, and the ISA bus):
•
The PL/PCI bridge chip (SB82437FX-66) which also provides control for
the PCI bus, level-2 cache memory, and main memory.
•
Two data path unit chips (SB82438FX) that provide a 64-bit data path
between the processor local bus and main memory modules.
•
The PCI/ISA bridge chip (SB82371FB) also provides control for the IDE.
Level-Two
Cache
Main
Memory
SB82371FB
PCI/ISA Bridge
BIOS
Pentium
Processor
SB82437FX-66 PCI, Cache
and Memory Controller
Host Bus
PCI Bus
ISA Bus
SB82438FX
Data Path Unit
PCI
Master
IDE
Controller
SB82438FX
Data Path Unit
ISA Bus
Controller
PCI
Master
PCI
Slave
APIC
Cache
Controller
Write
Buffer
Main
Memory
Controller
PCI
Slave
Summary of Contents for 520 5/XX
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