82801CA Datasheet, PDF (232/521 Pages) Intel Corporation – I/O Controller Hub 3-S (ICH3-S)

Register and Memory Mapping
6.3.2 Variable I/O Decode Ranges
Table 6-4 shows the Variable I/O Decode Ranges. They are set using Base Address Registers
(BARs) or other configuration bits in the various PCI configuration spaces. The PNP software (PCI
or ACPI) can use their configuration mechanisms to set and adjust these values.
When a cycle is detected on the hub interface, the ICH3 positively decodes the cycle. If the
response is on the behalf of an LPC device, the ICH3 forwards the cycle to the LPC I/F.
Refer to Table A-3 for a complete list of all variable I/O registers.
Warning: The Variable I/O Ranges should not be set to conflict with the Fixed I/O Ranges. Unpredictable
results if the configuration software allows conflicts to occur. The ICH3 does not perform any
checks for conflicts.
Table 6-4. Variable I/O Decode Ranges
Range Name
ACPI
IDE Bus Master
USB 1.1 Controller #1
SMBus
AC ’97 Audio Mixer
AC ’97 Bus Master
AC ’97 Modem Mixer
TCO
GPIO
Parallel Port
Serial Port 1
Serial Port 2
Floppy Disk Controller
MIDI
MSS
SoundBlaster
LAN
USB 1.1 Controller #2
USB 1.1 Controller #3
LPC Generic 1
LPC Generic 2
Monitors 4:7
Native IDE Primary
Command
Native IDE Primary
Control
Native IDE Secondary
Command
Native IDE Secondary
Control
Mappable
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
96 Bytes above ACPI Base
Anywhere in 64 KB I/O Space
3 ranges in 64 KB I/O Space
8 Ranges in 64 KB I/O Space
8 Ranges in 64 KB I/O Space
2 Ranges in 64 KB I/O Space
4 Ranges in 64 KB I/O Space
4 Ranges in 64 KB I/O Space
2 Ranges in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Anywhere in 64 KB I/O Space
Size (Bytes)
Target
64
Power Management
16
IDE Unit
32
USB Unit 1
32
SMB Unit
256
AC ’97 Unit
64
AC ’97 Unit
256
AC ’97 Unit
32
TCO Unit
64
GPIO Unit
8
LPC Peripheral
8
LPC Peripheral
8
LPC Peripheral
8
LPC Peripheral
2
LPC Peripheral
8
LPC Peripheral
32
LPC Peripheral
64
LAN Unit
32
USB Unit 2
32
USB Unit 3
128
LPC Peripheral
16
LPC Peripheral
16
LPC Peripheral or Trap on PCI
Anywhere in 64 KB I/O Space
8
IDE Unit
Anywhere in 64 KB I/O Space
4
IDE Unit
Anywhere in 64 KB I/O Space
8
IDE Unit
Anywhere in 64 KB I/O Space
4
IDE Unit
232
Intel^® 82801CA ICH3-S Datasheet