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Chapter 3
Table 3-26. I/O Address Assignment
I/O Address (hex)
0000 - 00FF
0100 - 010F
0170 - 0177
01F0 - 01F7
0376
0377
03B0 – 03DF
03F6
03F7
0480 – 04BF
04D0 – 04D1
0800 – 087F
0CF8 - 0CFB
0CFC - 0CFF
0D00 – FFFF
NOTE
The BIOS assigns PCI and PCI Express I/O resources from FFF0h downwards. Non
PnP/PCI/PCI Express compliant devices must not consume I/O resources in that
area.
LPC Bus
On the COM 830 the PCI Bus acts as the subtractive decoding agent. All I/O cycles that are not positively
decoded are forwarded to the PCI Bus not the LPC Bus. Only specified I/O ranges are forwarded to the LPC
Bus. In the BIOS the following I/O address ranges are sent to the LPC Bus:
280 – 2FF
3F8 – 3FF
3E8 – 3EF
A00 - A0F
Parts of these ranges are not available if a Super I/O is used on the carrier board. If a Super I/O is not
implemented on the carrier board then these ranges are available for customer use. If you require additional
LPC Bus resources other than those mentioned above, or more information about this subject, contact
Ampro technical support for assistance.
COM 830
Size
Available
256 bytes
No
16 bytes
No
8 bytes
No
8 bytes
No
1 byte
No
1 byte
No
16 bytes
No
1 byte
No
1 byte
No
64 bytes
No
2 bytes
No
128 bytes
No
4 bytes
No
4 bytes
No
See note
Reference Manual
Signals and Pinout Tables
Description
Motherboard resources
Ampro System Control
Secondary IDE channel
Primary IDE channels
Secondary IDE channel command
port
Secondary IDE channel status port
Video system
Primary IDE channel command port
Primary IDE channel status port
Motherboard resources
Motherboard resources
Motherboard resources
PCI configuration address register
PCI configuration data register
PCI / PCI Express bus
47
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