82093AA Datasheet, PDF (7/20 Pages) Intel Corporation – I/O ADVANCED PROGRAMMABLE INTERRUPT CONTROLLER (IOAPIC)

E
82093AA (IOAPIC)
Signal Name
INTIN2
INTIN[3:11,
14,15]
INTIN12
INTIN13
INTIN[16:19]
INTIN[20:21]
INTIN22
INTIN23/
SMI#
SMIOUT#
Type
ST
ST
ST
ST
ST
ST
ST
ST
OD
Description
Interrupt Input 2: This signal is connected to the redirection table entry 2. If
IRQ0 interrupt is available in hardware, it is connected to this pin.
Interrupt Inputs 3 through 11, 14 and 15: These signals are connected to
the redirection table entries 3:11, 14 & 15. Typically, these signals are
connected to the ISA interrupts IRQ[3:7,8#,9:11,14:15] respectively.
Interrupt Input 12: This signal is connected to the redirection table entry 12.
Typically, this signal will be connected to the mouse interrupt (IRQ12/M).
Interrupt input 13: This signal is connected to the redirection table entry 13. If
IRQ13 interrupt is available in hardware, it is connected to this signal. If IRQ13
is not available, it is routed through the INTR interrupt and this signal becomes
INTIN13 (redirection table entry 13).
Interrupt inputs 16 through 19: These signals are connected to the
redirection table entries [16:19]. Typically, these signals are connected to the
PCI interrupts (PIRQ[0:3]). The steering of the PCI IRQs to the ISA IRQs is
accomplished in the IOAPIC by setting the PCI redirection table entry to the
correct ISA interrupt vector.
Interrupt inputs 20 and 21: These signals are connected to the redirection
table entries 20 and 21. Typically, these signals are connected to the
motherboard interrupts (MIRQ[0:1]). These pins could be used for the NMI and
INIT signals or just general purpose interrupts.
Interrupt input 22: This signal is connect to the redirection table entry 22.
This signal is a general purpose interrupt.
Interrupt input 23: This signal is connected to the redirection table entry 23.
This input has a special feature for the SMI# interrupt routing. If the Mask bit is
not set, the signal is a normal interrupt input that is sent over the APIC bus just
like all the other interrupts. When the Mask bit is set, the INTIN23/SMI# input
is routed through the IOAPIC to the SMIOUT# output signal.
SMI OUTPUT: This signal is an output in response to the SMI# input when
the MASK bit for the redirection table entry number 23 is set. If the MASK bit
is not set, the redirection table can be setup to deliver an SMI# over the APIC
bus.
2.5. Test and Power Signals
Pin Name
Type
Description
TESTIN#
I
TEST INPUT: This active-low input is used to invoke test modes. TESTIN#
should be pulled high during normal operation.
VCC
VCC POWER PIN: 5V ± 10%.
GND
GROUND POWER PIN:
PRELIMINARY
7