System Resources; I/O Address Assignment; Lpc Bus; Table 38 I/O Address Assignment - Congatec COM Express conga-MA5 User Manual

9

System Resources

9.1

I/O Address Assignment

The I/O address assignment of the conga-MA5 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 38 I/O Address Assignment
I/O Address (hex)
0000h - 00FFh
03B0h - 03CFh
400h - 47Fh
500h - 5FFh
680h - 69Fh
0CF8h - 0CFBh
0CFCh - 0CFFh
0D00h - F000h
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-MA5, 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:
Copyright © 2017 congatec AG
Size
256 bytes
32 bytes
128 bytes
256 bytes
20 bytes
4 bytes
4 bytes
80h - 8Fh via LPC Generic I/O Range 1
A00h - A1Fh via LPC Generic I/O Range 4
Available Description
No Motherboard resources
No Video system
No Motherboard resources
No Motherboard resources
No Motherboard resources
No PCI configuration address register
No PCI configuration data register
See note PCI / PCI Express bus
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