
CME-Atom User Manual 1.2
www.diamondsystems.com
Page 29
03B0h-03BFh
MDA/MGA
03C0h-03CFh
EGA/VGA
03D4h-03D9h
CGA CRT register
03F0h-03F7h
Floppy Diskette
03F6h-03F6h
Primary IDE
03F8h-03FFh
COM_1 (If use)
0400h-041F
South Bridge SMB
04D0h-04D1h
IRQ Edge/level control ports
0500h-053Fh
South Bridge GPIO
0800h-087Fh
ACPI
0A00h-0A07h
PME
0A10h-0A17h
Hardware Monitor
0CF8h
PCI Configuration address
0CFCh
PCI Configuration Data
5.3
Interrupt Request (IRQ) Lines
Peripheral devices use interrupt request lines to notify CPU for the service required. The following table shows the
IRQ used by the devices on board.
IRQ Level
Function
IRQ 00
System Timer
IRQ 01
Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
IRQ 02
VGA and Link to Secondary PIC
IRQ 03
Communications Port (COM2)
IRQ 04
Communications Port (COM1)
IRQ 05
PCI Device
IRQ 06
Standard floppy disk controller
IRQ 07
Parallel Port
IRQ 08
System CMOS/real time clock
IRQ 09
Microsoft ACPI-Compliant System
IRQ 10
PCI Device
IRQ 11
PCI Device