82801E datasheet(41/84 Pages) INTEL

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Intel® 82801E C-ICH

Advance Information Datasheet

3.2.7

LPC Interface

3.2.8

Interrupt Interface

Table 13. LPC Interface Signals

Name

Type

Description

LAD[3:0]

/FWH[3:0]

I/O

LPC Multiplexed Command, Address, Data: Internal pull-ups are provided.

LFRAME#

/FWH[4]

LPC Frame: LFRAME# indicates the start of an LPC cycle, or an abort.

LDRQ[1:0]#

LPC Serial DMA/Master Request Inputs: These signals are used to request DMA or

bus master access. Typically, they are connected to external Super I/O device. An

internal pull-up resistor is provided on these signals.

Table 14. 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: In Non-APIC Mode 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: PIRQ[A]# is connected to IRQ16, PIRQ[B]# to IRQ17,

PIRQ[C]# to IRQ18, and PIRQ[D]# to IRQ19. This frees the ISA interrupts.

PIRQ[E:F]#

PIRQ[G]#/GPIO[4]

PIRQ[H]#/GPIO[5]

I/OD

PCI Interrupt Requests: In Non-APIC Mode 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: PIRQ[E]# is connected to IRQ20, PIRQ[F]# to IRQ21,

PIRQ[G]# to IRQ22, and PIRQ[H]# to IRQ23. This frees the ISA interrupts. If

not needed for interrupts, PIRQ[H:G] can be used as GPIO.

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: The APIC clock runs at 33.333 MHz.

APICD[1:0]

I/OD

APIC Data: These bidirectional 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.

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