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9.2
ALLOCATING IRQ LINES
Two 8259 interrupt controllers handle the interrupts as follows:
1.
Seven interrupt lines are directly linked to the keyboard controller, floppy controller,
timer, the real-time clock, both serial ports and the mouse.
2.
The system BIOS automatically allocates IRQ5 or IRQ7 to the Parallel Port's IRQ
line, depending on the settings in the AWARD BIOS. When the Parallel Port is set to
278h or 3BCh, IRQ5 is assigned. When set to 378h IRQ7 is assigned. When set to
Auto IRQ5 or IRQ7 is assigned. When Disabled, IRQ5 and IRQ7 are available for
onboard and external PCI/PnP devices, or for external non-PnP devices (see note 1
below).
3.
Primary and Secondary IDE controllers are configured with the AWARD BIOS
(Peripheral Setup option). IRQ 14 is linked to the primary IDE when the option is set
to Primary or Both. IRQ 15 is linked to the secondary IDE when the option is set to
Secondary or Both. IRQ 14 and IRQ 15 are available for on board/external PCI/PnP
devices or external non-PnP devices (see note 1 below), when the option is set to
Disabled.
4.
The on board Plug and Play Ethernet is automatically allocated with an IRQ line by the
system BIOS among the available PCI/PnP IRQ lines.
DMA channels are assigned as follow:
Controller # 1
IRQ 0
Timer 0
IRQ 1
Keyboard
IRQ 2
Cascade controller # 2
IRQ 3
COM 2 *
IRQ 4
COM 1 *
IRQ 5
LPT2 * or available
IRQ 6
Floppy controller *
IRQ 7
LPT1 * or available
*
All functions marked with an asterisk (*) can be disabled or reconfigured.
1
Available lines service on board and external PCI/PnP devices (when set to PCI/PnP in
AWARD BIOS PCI/PnP Setup screen) or an external non-PnP device (when set to ISA/EISA in
AWARD BIOS PCI/PnP Setup screen).
TEK-CPCI-1000 Technical Reference Manual
IRQ 8
IRQ 9
IRQ 10
IRQ 11
IRQ 12
1
IRQ 13
IRQ 14
1
IRQ 15
9-2
Controller # 2
Real-time clock
1
Available
1
Available
1
Available
PS/2 Mouse Interface
Coprocessor Error
1
Primary IDE * or available
Secondary IDE * or available
1
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