Integrated Pci Bridge - EPOX P55TV2 Manual

Hardware Design 2-11

2-6 Integrated PCI Bridge

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The P55TV2 utilizes Intel's 430VX PCIset chipset to support Intel Pentium Proces-
sor PCI/ISA system. The Intel 82430VX PCIset chipset consists of one 82437VX
system controller (TVC), two 82438VX Data Path (TDP) devices, and one 82371SB
PCI ISA/IDE Accelerator (PIIX3) bridge chip. It provides an interface which trans-
lates CPU cycle into PCI bus cycle and PCI burst read/write capability. In addition, it
provides high performance PCI arbiter or supports four PCI Masters, Rotating
Priority Mechanism, and Hidden Arbitration Scheme Minimizes Arbitration Over-
head. The 82371SB(PIIX3) supports PCI Specification Revision 2.1 Compliant and
contains a Universal Serial Bus interface with both host and hub control functions.
The P55TV2 reserves USB connector to provide two USB ports for serial transfer at
12 or 1.5 Mbit/sec. This will supports legacy keyboard and mouse software with
USB-Base Keyboard and mouse.
There are four interrupts in each PCI slot : INTA#, INTB#, INTC#, and INTD#, since
the P55TV2 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 interrupts
used by ISA add-in cards in the BIOS Setup utility.
If a "Legacy card" (such as paddle card and cable) is plugged into the ISA slot the
following modifications in the ROM SETUP UTILITY become necessary. First,
enter PCI CONFIGURATION SETUP utility from ROM SETUP UTILITY
main menu to set the "PCI IDE IRQ MAP TO : ISA".
Second, 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 plugg the PCI/ISA IDE card
into the system, You should Disabled Onboard Primary and Secondary PCI IDE
from CHIPSET FEATURES SETUP UTILITY too.
you can set the system interrupt request (IRQ) on some "Legacy cardswhich 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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