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54 CMX58886CX cpuModule BDM-610000050 Rev A
I/O Address Map
As with all standard PC/104 boards, the I/O space is addressed by 10 address lines (SA0–SA9). This allows 2
10
or
1024 distinct I/O addresses. Any add-on modules you install must therefore use I/O addresses in the range of
0–1023 (decimal) or 000–3FF (hex).
Table 37 lists I/O addresses reserved for the CMX58886CX 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 37 I/O Addresses Reserved for the CMX58886CX 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. Only one of the I/O addresses shown for a serial port is active at any time. You can use Setup to select
which one is active or to disable it entirely.
2F8–2FFh 8 Serial Port
3
3E8–3EFh 8 Serial Port
3
3F0–3F7h 8 Floppy Disk
1
3F8–3FFh 8 Serial Port
3
450-453h 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