ECM-3410/3410L/3410N
ECM-3410/3410L/3410N User’s Manual
101
Interrupt Usage
The onboard CS5530A provides an ISA compatible interrupt controller with functionality as
two 8259A interrupt controllers. The two controllers are cascaded to provide 13 external
interrupts. Most of these are used by onboard devices, but a few are available through the
PC/104 interface.
The actual interrupt settings depend on the PnP handler, the table below indicates the
typical settings.
Interrupt
Description
Note
NMI
DRAM parity errors and IOCHCHK signal activation
IRQ0
TIMER 0 interrupt
IRQ1
Standard 101/102 keyboard
IRQ2
Used for cascading IRQ8 - IRQ15
IRQ3
Serial port 1 or 2 or IrDA communication Device
1
IRQ4
Serial port 1 or 2
1
IRQ5
XpressAUDIO 16-bit sound
1,2
IRQ6
Floppy disk controller
1
IRQ7
Parallel port
1
IRQ8
Real time clock
IRQ9
Available for PC/104 interface
IRQ10
IRQ holder for PCI steering
IRQ10
Intel ® GD82559ER PCI Adapter
1,2
IRQ11
IRQ holder for PCI steering
IRQ11
Intel ® GD82559ER PCI Adapter
1,2
IRQ12
Standard PS/2 port mouse
1
IRQ13
Numeric processor
IRQ14
Standard dual PCI IDE controller
3
IRQ14
Primary IDE controller (single FIFO)
3
IRQ15
Available for PC/104 interface
Note:
1. The usage of these interrupts depends on the choices made in the Evalue setup
screen. The interrupts are fully useable for PC/104 interface if the corresponding
on-board unit is disabled in the BIOS setup.
2. These interrupt lines are managed by the PnP handler and are subject to change
during system initialisation.
3. IRQ14 is routed directly from the IDE hard disk connector to the PC-AT bus.
4. Disabling the hard disk controller in the Evalue setup screen may not release the
interrupt line.
