HP Compaq d330 DT User Manual

Technical Reference Guide
8259 Mode
The 8259 mode handles interrupts IRQ0-IRQ15 in the legacy (AT-system) method using 8259-
equivalent logic. Table 4-6 lists the standard source configuration for maskable interrupts and
their priorities in 8259 mode. If more than one interrupt is pending, the highest priority (lowest
number) is processed first.
Table 4-6. Maskable Interrupt Priorities and Assignments
Table 4-6.
Maskable Interrupt Priorities and Assignments
Priority Signal Label Source (Typical)
1 IRQ0 Interval timer 1, counter 0
2 IRQ1 Keyboard
3 IRQ8- Real-time clock
4 IRQ9 Unused
5 IRQ10 PCI devices/slots
6 IRQ11 Audio codec
7 IRQ12 Mouse
8 IRQ13 Coprocessor (math)
9 IRQ14 Primary IDE controller
10 I RQ15 Secondary IDE I/F controller
11 IRQ3 Serial port (COM2)
12 IRQ4 Serial port (COM1)
13 IRQ5 Network interface controller
14 IRQ6 Diskette drive controller
15 IRQ7 Parallel port (LPT1)
-- IRQ2 NOT AVAILABLE (Cascade from interrupt controller 2)
Int. Cntlr.
APIC Mode
The Advanced Programmable Interrupt Controller (APIC) mode provides enhanced interrupt
rocessing with the following advantages: p
pt acknowledge cycle by using a separate (APIC) bus ♦ Eliminates the processor’s interru
♦ Programmable interrupt priority
Additional interrupts (total of 24) ♦
The APIC mode accommodates eight PCI interrupt signals (INTA-..INTH-) for use by PCI
evices. The PCI interrupts are evenly distributed to minimize latency and wired as follows: d
82801
PCI
Slot 1
PCI
Slot 2
PCI
Slot 3
PCI
Slot 4
PCI
Slot 5
AGP
Slot
NIC
I/F [1]
I/F #2
USB
INTA- IN TA- TD- — — —
INTB- — — — — — — — —
INTC- TB- — —
INTD- — — — — — IN TB- — —
INTE- — — — — — — IN TA- —
INTF- INTC- INTB- INTA- INTD- INTB- — — —
INTG- IN TD- TC- — — —
INTD- INTC- INTB- IN
ired
IN INTA- INTD- INTC- INTA- INTA-
INTC- INTB- INTA- IN
INTH- — — — — — — — INTC-
NOTES:
H. Will be reported by BIOS as using INTA but is NOT shared with
nly.
ST, DT, MT, CMT form factors only.
W
to
[1] Connection internal to the IC
other functions using INTA.
ST, SFF, DT. MT, CMT form factors o
hp compaq d330 and d530 Series of Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - June 2003
4-15

HP Compaq d330 DT Specifications

General

Brand	HP
Model	Compaq d330 DT
Category	Desktop
Language	English