Integrated Pci Bridge - EPOX P55-KV Manual

Hardware Design 2-7

2-5 Integrated PCI Bridge

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The P55-KV utilizes VIA 82C580VPX PCIset chipset to support Intel Pentium
Processor PCI/ISA system. The VIA 82C580VPX PCIset chipset consists of one
82C585VPX system controller (TSC), two 82C587VP Data Path (TDP) devices, and
one 82C586A 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 two 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 P55-KV 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 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 plug paddle card and cable into the ISA slot.)
is plugged in the system, the following modifications in the ROM SETUP UTILITY
become necessary. First, you must enter PCI CONFIGURATION SETUP utility from
ROM SETUP UTILITY main menu to set the "PCI IDE IRQ MAP TO : ISA".
Then, you must enter CHIPSET FEATURES SETUP UTILITY from ROM SETUP
UTILITY main menu and set the "Onboard Primary PCI IDE: Disabled and Onboard
Secondary PCI IDE: Disabled." When you plug the PCI/ISA IDE card into the
system, You should Disable Onboard Primary and Secondary PCI IDE from
CHIPSET FEATURES SETUP UTILITY too.
you can set the system interrupt request (IRQ) on some "Legacy cards" which have
no paddle card and cable (refer to user's manual of the card) to a proper system IRQ
level (In general, the 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 PCI CONFIGURATION
SETUP utility from ROM SETUP UTILITY main menu and sets the "PCI IDE IRQ
MAP TO : PCI-Slot 1" (depend on the slot # where the Legacy card is plugged).
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