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60 CMX158886 cpuModule BDM-610000049 Rev G
I/O Address Map
As with all standard PC/104 boards, the I/O total I/O space is 64k in size. However, because early processors only
addressed 0 address lines (SA0–SA9), the first 1k is used for legacy I/O devices. Any ISA add-on modules you
install must therefore use I/O addresses in the range of 0–1023 (decimal) or 000–3FF (hex). The upper I/O
addresses are used for PCI I/O devices, and are automatically assigned by the BIOS or operating system at boot
time.
Table 42 lists I/O addresses reserved for the CMX158886 cpuModule.
Note If you add any PC/104 modules or other peripherals to the system you must ensure they do not use
reserved addresses listed below, or malfunctions will occur. The exception to this is if the resource has been
released by the user.
Table 42 I/O Addresses Reserved for the CMX158886 cpuModule
Address Range (hex) Bytes Device
000–00Fh 16 DMA Controller
010–01Fh 16 Reserved for CPU
020–021h 2 Interrupt Controller 1
022–02Fh 13 Reserved
040–043h 4 Timer
060–064h 5 Keyboard Interface
070–071h 2 Real Time Clock Port
080–08Fh 16 DMA Page Register
0A0–0A1h 2 Interrupt Controller 2
0C0–0DFh 32 DMA Controller 2
0F0–0FFh 16 Math Coprocessor
100–101h 2 Video Initialization
1F0–1FFh 16 Hard Disk
1
1. If a floppy or IDE controller is not connected to the system, the I/O addresses listed will not be occupied.
200–201h 2 Reserved
238–23Bh 4 Bus Mouse
2
2. If a PS/2 mouse is not connected to the system, the I/O addresses listed will not be occupied.
2E8–2EFh 8 Serial Port
3
3. The I/O addresses for the serial port are selected in the BIOS Setup utility.
2F8–2FFh 8 Serial Port
3
3E8–3EFh 8 Serial Port
3
3F0–3F7h 8 Floppy Disk
1
3F8–3FFh 8 Serial Port
3
450-454h 4 aDIO
4
4. If aDIO is disabled, the I/O addresses listed will not be occupied.
455h 1 Watchdog Timer
5
5. If watchdog timer is disabled, the I/O addresses listed will not be occupied.
456-45F 9 EPLD