System Resources; I/O Address Assignment; Lpc Bus - Congatec COM Express conga-TCA3 User Manual

9

System Resources

9.1

I/O Address Assignment

The I/O address assignment of the conga-TCA3 module is functionally identical with a standard PC/AT. 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.
9.1.1

LPC Bus

On the conga-TCA3, the Platform Controller Hub (PCH) acts as the subtractive decoding agent. All I/O cycles that are not positively decoded
are forwarded to the PCH and the LPC Bus. Some fixed I/O space ranges seen by the processor are:
Device
8259 Master
8254s
Ps2 Control
NMI Controller
RTC
Port 80h
Init Register
8259 Master
PCU UART
Reset Control
Active Power Management
Some of these ranges are used by a Super I/O if implemented on the carrier board or are occupied by the COM Express on-module UARTs if
these are enabled in the setup. If you require additional LPC Bus resources other than those mentioned above, or more information about this
subject, contact congatec technical support for assistance.
Copyright © 2014 congatec AG
IO Address
20h-21h, 24h-25h, 28h-29h, 2Ch-2Dh, 30h-31h, 34h-35h, 38h-39h, 3Ch-3Dh
40h-43h, 50h-53h
60h, 64h
61h, 63h, 65h, 67h
70h-77h
80h-83h
92h
A0h- A1h, A4h-A5h, A8h-A9h, Ach-ADh, B0h-B1h, B4h-B5h, B8h-B9h, Bch-BDh, 4D0h-4D1h
3F8h-3FFh
CF9h
B2h-B3h
TA30m16 62/95