2-6 P55KTX
2-4 Integrated PCI Bridge
The
P55KTX
utilizes
VIA Apollo VPX/97 PCIset
chipset to support Intel Pentium
Processor PCI/ISA system. The VIA Apollo VPX/97 PCIset chipset consists of the
82C585VPX system controller (TSC), two 82C587VP Data Path (TDP) devices, and
one 82C586B PCI ISA/IDE Accelerator bridge chip. It provides an interface which
translates CPU cycle into PCI bus cycle, and PCI burst read/write capability. In
addition, it provides high performance PCI arbitor to support four PCI Masters,
Rotating Priority Mechanism, and Hidden Arbitration Scheme Minimizes Arbitration
Overhead.
There are four interrupts in each PCI slot : INTA#, INTB#, INTC#, and INTD#. Since
the
P55KTX
adapts the PCI auto-configuration with the system BIOS Setup utility.
When the system is turned on after adding a PCI add-in card, the BIOS automatically
configure interrupts, DMA channels, I/O space, and other paramaters. You do not
have to configure jumpers or worry about potential resource conflicts. Because PCI
cards use the same interrupt resource as ISA cards, you must specify the interrupt
used by ISA add-in cards in the BIOS Setup utility.
However, if a "Legacy card" (such as plugging a paddle card and cable into an ISA
slot) is plugged in the system, modification in the
ROM SETUP UTILITY
becomes
necessary. First of all, you must enter
PCI CONFIGURATION SETUP
utility from
the
ROM SETUP UTILITY
main menu to set "ISA" for the "
PCI IDE IRQ MAP TO
Secondly, you must enter the
CHIPSET FEATURES SETUP UTILITY
from the
ROM
SETUP UTILITY
main menu and set "Disable" for the "
Onboard Primary PCI IDE
and the
Onboard Secondary PCI IDE
. When you plug PCI/ISA IDE cards into the
system, You should select "Disabled" for the
Onboard Primary and Secondary PCI
IDE
from the
CHIPSET FEATURES SETUP UTILITY
too.
You can set the system interrupt request (IRQ) on some "Legacy cards" which have
on paddle card and cable. (refer to user's manual of the card) to a proper system IRQ
level (In general, card's Primary is assigned to INTA and Secondary is assigned to
INTB). If the card is plugged into slot 1(marked PCI#1), you cannot use second slot
(marked PCI#2) because the Secondary INT signal takes INTB from the slot (refer to
Page 3-12 for circuit diagram). The user then enters the
PCI CONFIGURATION
SETUP
utility from the
ROM SETUP UTILITY
main menu and set "PCI-Slot 1" for
the "
PCI IDE IRQ MAP TO
(This depends on the slot # where the Legacy card is
plugged).
.
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