System Resources; I/O Address Assignment; Lpc Bus; Table 35 I/O Address Assignment - Congatec COM Express conga-TCA5 User Manual

9

System Resources

9.1

I/O Address Assignment

The I/O address assignment of the conga-TCA5 module is functionally identical with a standard PC/AT. The table below shows the most
important addresses and the addresses that differ from the standard PC/AT configuration.
Table 35 I/O Address Assignment
I/O Address (hex)
0000 - 00FF
03B0 - 03CF
0400 - 047F
0500 - 05FF
0680 - 069F
0CF8 - 0CFB
0CFC - 0CFF
0D00 - F000
Note
The BIOS assigns PCI and PCI Express I/O resources from F000h downwards. Devices that are not compliant to PnP, PCI or PCI Express must
not use any I/O resource in this address range.
9.1.1

LPC Bus

On the conga-TCA5, the internal PCI bus acts as the subtractive decoding agent. All I/O cycles that are not positively decoded are forwarded
to the PCI 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 forwarded to the LPC bus:
Copyright © 2017 congatec GmbH
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
TA50m19 65/70