110502
PRODUCT MANUAL EPX-C380
16
Interrupt Status Register - 1ECH
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
N/A
N/A
N/A
N/A
COM4
COM3
COM2
COM1
Note:
A
1
will be read for the device(s) with an interrupt pending.
Interrupt Map
WinSystems does not provide software support for implementing the Interrupt Status
Register to share interrupts. Some operating systems, such as Windows XP and Linux,
have support for sharing serial port interrupts and examples are available. The user will
need to implement the appropriate software to share interrupts for the other devices.
Hardware Interrupts (IRQs) are supported for both PC/104 (ISA) and PCIe devices. The user must reserve IRQs in the
BIOS CMOS configuration for use by legacy devices. The PCIe/PnP BIOS will use unreserved IRQs when allocating
resources during the boot process. The table below lists IRQ resources as used by the EPX-C380.
IRQ0
18.2 Hz heartbeat
IRQ1
Keyboard
IRQ2
Chained to Slave controller (IRQ9)
IRQ3
COM2 *
IRQ4
COM1 *
IRQ5
COM3 *
IRQ6
COM4 *
IRQ7
LPT *
IRQ8
Real Time Clock
IRQ9
FREE **
IRQ10
Digital I/O
IRQ11
PCIe Interrupts
IRQ12
Mouse
IRQ13
Floating point processor
IRQ14
IDE
IRQ15
PCIe Interrupts
*
These IRQ references are default settings that can be changed by the user in the CMOS Settings
utility. Reference the Super I/O Control section under Intel.
**
IRQ9 is commonly used by ACPI when enabled and may be unavailable (depending on operating
system) for other uses.
***
IRQ15 is currently unavailable under the Windows operating systems.
Some IRQs can be freed for other uses if the hardware features they are assigned to are not being
used. To free an interrupt, use the CMOS setup screens to disable any unused board features or their
IRQ assignments.
Preliminary