82801AB datasheet(34/414 Pages) INTEL

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Signal Description

2-6

82801AA and 82801AB Datasheet

2.6

Interrupt Interface

2.7

USB Interface

Table 2-6. Interrupt Signals

Name

Type

Description

SERIRQ

I/O

Serial Interrupt Request: This pin implements the serial interrupt protocol.

PIRQ[A:D]#

I/OD

PCI Interrupt Requests: The PIRQx# signals can be routed to interrupts 3:7, 9:12, 14

or 15 as described in the Interrupt Steering section. Each PIRQx# line has a separate

Route Control Register.

In APIC mode, these signals are connected to the internal I/O APIC in the following

fashion: PIRQA# is connected to IRQ16, PIRQB# to IRQ17, PIRQC# to IRQ18, and

PIRQD# to IRQ19. This frees the ISA interrupts.

IRQ[14,15]

Interrupt Request 14, 15: These interrupt inputs are connected to the IDE drives.

IRQ14 is used by the drives connected to the Primary controller and IRQ15 is used by

the drives connected to the Secondary controller.

APICCLK

APIC Clock: This clock can run at 16.66667 MHz and is the APIC bus clock.

APICD[1:0]

I/OD

APIC Data: These bi-directional open drain signals are used to send and receive data

over the APIC bus. As inputs the data is valid on the rising edge of APICCLK. As

outputs, new data is driven from the rising edge of the APICCLK.

Table 2-7. USB Interface Signals

Name

Type

Description

USBP1P

USBP1N

I/O

Universal Serial Bus Port 1 Differential: Bus Data/Address/Command Bus

USBP0P

USBP0N

I/O

Universal Serial Bus Port 0 Differential: Bus Data/Address/Command Bus

OC[1:0]#

Overcurrent Indicators: These signals set corresponding bits in the USB controller to

indicate that an overcurrent condition has occurred.

82801AB Datasheet(PDF) 34 Page - Intel Corporation

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