FW82801EB Intel, FW82801EB Datasheet - Page 131

• Manufacturer Part Number: FW82801EB
• Manufacturer: Intel

Specifications of FW82801EB

• Lead Free Status / RoHS Status: Not Compliant

5.9.3
Intel
®
Table 48. APIC Interrupt Mapping (Sheet 2 of 2)
82801EB ICH5 / 82801ER ICH5R Datasheet
NOTES:
PCI Message-Based Interrupts
The following scheme is only supported when the internal I/O(x) APIC is used (rather than just the
8259). The ICH5 supports the new method for PCI devices to deliver interrupts as write cycles,
rather than using the traditional PIRQ[A:D] signals. Essentially, the PCI devices are given a write
path directly to a register that will cause the desired interrupt. This mode is only supported when
the ICH5’s internal I/O APIC is enabled.
The interrupts associated with the PCI Message-based interrupt method must be set up for edge
triggered mode, rather than level triggered, since the peripheral only does the write to indicate the
edge.
1. IRQ 14 and 15 can only be driven directly from the pins when in legacy IDE mode.
2. When programming the polarity of internal interrupt sources on the APIC, interrupts 0 through 15 receive
3. If IRQ 11 is used for HPET #2, software should ensure IRQ 11 is not shared with any other devices to
4. PCI Message interrupts are not prevented by hardware in these cases. However, the system must not
IRQ #
active-high internal interrupt sources, while interrupts 16 through 23 receive active-low internal interrupt
sources.
guarantee the proper operation of HPET #2. ICH5 hardware does not prevent sharing of IRQ 11.
program these interrupts as edge-triggered (as required for PCI message interrupts) because the internal
and external PIRQs on these inputs must be programmed in level-triggered modes.
16
17
18
19
20
21
22
23
SERIRQ
PIRQA#
PIRQB#
PIRQC#
PIRQD#
N/A
N/A
N/A
N/A
Via
Direct from
PIRQC#
PIRQD#
PIRQG#
PIRQH#
PIRQA#
PIRQB#
PIRQE#
PIRQF#
Pin
Message
Via PCI
No
No
No
No
No
No
Yes
Yes
4
4
4
4
4
4
USB UHCI Controller #1, USB UHCI Controller #4
AC ’97 Audio, Modem, option for SMbus
USB UHCI Controller #3, Storage (IDE/SATA) Native
mode
USB UHCI Controller #2
LAN, option for SCI, TCO, HPET #0,1,2
Option for SCI, TCO, HPET #0,1,2
Option for SCI, TCO, HPET #0,1,2
USB EHCI Controller, option for SCI, TCO, HPET #0,1,2
Internal Modules
Functional Description
131