82801CA Datasheet, PDF (228/521 Pages) Intel Corporation – I/O Controller Hub 3-S (ICH3-S)

Register and Memory Mapping
6.1
PCI Devices and Functions
The ICH3 incorporates a variety of PCI functions as shown in Table 6-1. These functions are
divided into four logical devices (B0:D30, B0:D31, B0:D29 and B1:D8). D30 is the hub interface-
to-PCI bridge, D31 contains the PCI-to-LPC Bridge, IDE Controller, SMBus Controller and the
AC ’97 Audio and Modem Controller functions and D29 contains the three USB 1.1 Controllers.
B1:D8 is the integrated LAN Controller.
Note: From a software perspective, the integrated LAN Controller resides on the ICH3’s external PCI bus
(See Section 5.1.2). This is typically Bus 1, but may be assigned a different number depending
upon system configuration.
If for some reason, the particular system platform does not want to support any one of Device 31’s
Functions 1-6, Device 29’s functions, or Device 8, they can individually be disabled. The
integrated LAN Controller will be disabled if no Platform LAN Connect component is detected
(See Section 5.2.2.3). When a function is disabled, it does not appear at all to the software. A
disabled function will not respond to any register reads or writes. This is intended to prevent
software from thinking that a function is present (and reporting it to the end-user).
Table 6-1. PCI Devices and Functions
Bus:Device:Function
Function Description
Bus 0:Device 30:Function 0
Bus 0:Device 31:Function 0
Bus 0:Device 31:Function 1
Bus 0:Device 31:Function 3
Bus 0:Device 31:Function 5
Bus 0:Device 31:Function 6
Bus 0:Device 29:Function 0
Bus 0:Device 29:Function 1
Bus 0:Device 29:Function 2
Bus n:Device 8:Function 0
Hub Interface to PCI Bridge
PCI to LPC Bridge¹
IDE Controller
SMBus Controller
AC ’97 Audio Controller
AC ’97 Modem Controller
USB UHCI Controller #1
USB UHCI Controller #2
New: USB UHCI Controller #3
LAN Controller
NOTES:
1. The PCI to LPC bridge contains registers that control LPC, Power Management, System Management,
GPIO, Processor Interface, RTC, Interrupts, Timers, DMA.
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Intel^® 82801CA ICH3-S Datasheet