876784 Intel, 876784 Datasheet - Page 62

• Manufacturer Part Number: 876784
• Manufacturer: Intel

Specifications of 876784

• Lead Free Status / RoHS Status: Compliant

2.9
Table 2-9.
2.10
Table 2-10. Interrupt Signals
62
LPC Interface
LPC Interface Signals
Interrupt Interface
LFRAME# /
LAD[3:0] /
PIRQ[D:A]#
PIRQ[H:E]#
/ GPIO[5:2]
and Mobile
LDRQ1# /
and Mobile
FWH[3:0]
(Desktop
LDRQ0#
(Desktop
GPIO23
SERIRQ
Name
IDEIRQ
FWH4
Name
only)
only)
Type
Type
I/O
I/OD
I/OD
I/O
O
I
I
LPC Multiplexed Command, Address, Data: For LAD[3:0], internal pull-
ups are provided.
LPC Frame: LFRAME# indicates the start of an LPC cycle, or an abort.
LPC Serial DMA/Master Request Inputs: LDRQ[1:0]# are used to
request DMA or bus master access. These signals are typically connected
to external Super I/O device. An internal pull-up resistor is provided on
these signals.
LDRQ1# may optionally be used as GPIO.
Serial Interrupt Request: This pin implements the serial interrupt
protocol.
PCI Interrupt Requests: In non-APIC mode the PIRQx# signals can be
routed to interrupts 3, 4, 5, 6, 7, 9, 10, 11, 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 legacy
interrupts.
PCI Interrupt Requests: In non-APIC mode the PIRQx# signals can be
routed to interrupts 3, 4, 5, 6, 7, 9, 10, 11, 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: PIRQE# is connected to IRQ20, PIRQF# to IRQ21,
PIRQG# to IRQ22, and PIRQH# to IRQ23. This frees the legacy
interrupts. If not needed for interrupts, these signals can be used as
GPIO.
IDE Interrupt Request: This interrupt input is connected to the IDE
drive.
Description
Description
Intel
®
ICH7 Family Datasheet
Signal Description