1-22
1.8.3
PCI I/O Subsystem
The I/O subsystem consists of two 64-bit PCI busses. One has an imbedded
EISA/ISA bridge and three PCI option slots; the other has a built in CD-ROM
driver and three PCI options slots.
Figure 1-11 PCI Block Diagram
EISA:
1 16-
bit slot
I2C Bus
Interface
Mouse/
Keyboard
Combo I/O:
serial ports
parallel port
floppy cntrl
Realtime
Clock
Flash
ROM
2MB
NVRAM
8Kx8
BDATA
Xceivers
XBUS
Xceivers
XBUS
EISA
Data
Bus
PCI-0
PCI-1
2 64-bit slots
1 32-bit slot
3 64-bit slots
Serial
Interrupt
Logic
33.3MHz
Osc
Clock Bfr
40MHz
Clock
3&, %XV
PCI-1 Bus
Serial
Interrupt
Logic
PCI to ISA Bridge
Chipset
SCSI Control
53C810
Connector
PKW0508-97
S
y
s
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m
B
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