Copyright
©
2017
congatec
AG
QA50m10
55/61
9
System Resources
9.1
I/O Address Assignment
The I/O address assignment of the conga-QA5 module is functionally identical with a standard PC/AT. The most important addresses and the
ones that differ from the standard PC/AT configuration are listed below.
Table 32
I/O Address Assignment
I/O Address (hex)
Size
Available
Description
0000h - 00FFh
256 bytes
No
Motherboard resources
03B0h - 03CFh
32 bytes
No
Video system
400h - 47Fh
128 bytes
No
Motherboard resources
500h - 5FFh
256 bytes
No
Motherboard resources
680h - 69Fh
20 bytes
No
Motherboard resources
0CF8h - 0CFBh
4 bytes
No
PCI configuration address register
0CFCh - 0CFFh
4 bytes
No
PCI configuration data register
0D00h - F000h
See note
PCI / PCI Express bus
Note
The BIOS assigns PCI and PCI Express I/O resources from F000h downwards. Non PnP/PCI/PCI Express compliant devices must not consume
I/O resources in that area.
9.1.1
LPC Bus
On the conga-QA5, the internal PCI Bus acts as the substractive 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. With the default settings in the congatec Embedded
BIOS, the following I/O address ranges are sent to the LPC Bus:
80h - 8Fh via LPC Generic I/O Range 1
A00h - A1Fh via LPC Generic I/O Range 4
