307013-003 Datasheet, PDF (62/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

Signal Description
2.9
LPC Interface
Table 2-9.
LPC Interface Signals
Name
Type
Description
LAD[3:0] /
FWH[3:0]
I/O
LPC Multiplexed Command, Address, Data: For LAD[3:0], internal pull-
ups are provided.
LFRAME# /
FWH4
O
LPC Frame: LFRAME# indicates the start of an LPC cycle, or an abort.
LDRQ0#
LDRQ1# /
GPIO23
(Desktop
and Mobile
only)
LPC Serial DMA/Master Request Inputs: LDRQ[1:0]# are used to
request DMA or bus master access. These signals are typically connected
I ^{to external Super I/O device. An internal pull-up resistor is provided on}
these signals.
LDRQ1# may optionally be used as GPIO.
2.10 Interrupt Interface
Table 2-10. Interrupt Signals
Name
Type
Description
SERIRQ
PIRQ[D:A]#
(Desktop
and Mobile
only)
PIRQ[H:E]#
/ GPIO[5:2]
IDEIRQ
I/O
I/OD
I/OD
I
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.
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Intel ^® ICH7 Family Datasheet