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CMOS Setup / Advanced Configuration
Configuration / Operation – 14 EPM-4 Reference Manual
COM1 (03F8H) RS-232
Default: IRQ4
Allows you to disable or specify the IRQ used by internal UART1 on the ÉlanSC520
Microcontroller. When disabled, the IRQ and I/O space are freed.
COM2
(02F8H) RS-232
Default: IRQ3
Allows you to disable or specify the IRQ used by internal UART2 on the ÉlanSC520
Microcontroller. When disabled, the IRQ and I/O space are freed.
COM3
(03E8H) RS-422/485
Default: Disabled
Allows you to disable or specify the IRQ used by UART1 on the SMSC FDC37B727 Super I/O.
When disabled, the IRQ and I/O space are freed.
COM4
(02E8H) RS-422/485
Default: Disabled
Allows you to disable or specify the IRQ used by UART2 on the SMSC FDC37B727 Super I/O.
When disabled, the IRQ and I/O space are freed.
GP
TIMER 0, GP TIMER 1, WATCHDOG TIMER
Default: Disabled
These internal SC520 devices can be disabled or enabled by assigning an IRQ. Enabling these
devices only sets up the IRQ assignment; it is up to the user to set up device operation. Refer to
the ÉlanSC520 Microcontroller User's Manual for details.
PCI
INTERRUPT A, B, C, AND D
Default: IRQ11
These options allow manual IRQ routing of PCI devices.
Note: PCI devices can share an interrupt. In most cases, the cost of doing this is slightly decreased
system performance and slightly increased interrupt response time.