IBM BDM-610000049 user manual I/O Address Map, I/O Addresses Reserved for the CMX158886 cpuModule

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.

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 lists I/O addresses reserved for the CMX158886 cpuModule.

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 Disk1
200–201h	2	Reserved
238–23Bh	4	Bus Mouse2
2E8–2EFh	8	Serial Port3
2F8–2FFh	8	Serial Port3
3E8–3EFh	8	Serial Port3
3F0–3F7h	8	Floppy Disk1
3F8–3FFh	8	Serial Port3
450-454h	4	aDIO4
455h	1	Watchdog Timer5
456-45F	9	EPLD

1.If a floppy or IDE controller is not connected to the system, the I/O addresses listed will not be occupied.

2.If a PS/2 mouse is not connected to the system, the I/O addresses listed will not be occupied.

3.The I/O addresses for the serial port are selected in the BIOS Setup utility.

4.If aDIO is disabled, the I/O addresses listed will not be occupied.

5.If watchdog timer is disabled, the I/O addresses listed will not be occupied.

60 CMX158886 cpuModule BDM-610000049 Rev G