82801DB Datasheet, PDF (28/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

Introduction
Chapter 5. Functional Description
Chapter 5 provides a detailed description of the functions in the ICH4. All PCI buses, devices, and
functions in this datasheet are abbreviated using the following nomenclature;
Bus:Device:Function. This datasheet abbreviates buses as B0 and B1, devices as D8, D29, D30 and
D31 and functions as F0, F1, F2, F3, F4, F5, F6 and F7. For example Device 31 Function 5 is
abbreviated as D31:F5, Bus 1 Device 8 Function 0 is abbreviated as B1:D8:F0. Generally, the bus
number will not be used, and can be considered to be Bus 0. Note that the ICH4’s external PCI bus
is typically Bus 1, but may be assigned a different number depending upon system configuration.
Chapter 6. Register, Memory and I/O Address Maps
Chapter 6 provides an overview of the registers, fixed I/O ranges, variable I/O ranges and memory
ranges decoded by the ICH4.
Chapter 7. LAN Controller Registers
Chapter 7 provides a detailed description of all registers that reside in the ICH4’s integrated LAN
controller. The integrated LAN controller resides on the ICH4’s external PCI bus (typically Bus 1)
at Device 8, Function 0 (B1:D8:F0).
Chapter 8. Hub Interface to PCI Bridge Registers
Chapter 8 provides a detailed description of all registers that reside in the Hub Interface to PCI
bridge. This bridge resides at Device 30, Function 0 (D30:F0).
Chapter 9. LPC Bridge Registers
Chapter 9 provides a detailed description of all registers that reside in the LPC bridge. This bridge
resides at Device 31, Function 0 (D31:F0). This function contains registers for many different units
within the ICH4 including DMA, Timers, Interrupts, CPU Interface, GPIO, Power Management,
System Management and RTC.
Chapter 10. IDE Controller Registers
Chapter 10 provides a detailed description of all registers that reside in the IDE controller. This
controller resides at Device 31, Function 1 (D31:F1).
Chapter 11. USB UCHI Controller Registers
Chapter 11 provides a detailed description of all registers that reside in the three UHCI host
controllers. These controllers reside at Device 29, Functions 0, 1 and 2 (D29:F0/F1/F2).
Chapter 12. USB EHCI Controller Registers
Chapter 12 provides a detailed description of all registers that reside in the EHCI host controller.
This controller resides at Device 29, Function 7 (D29:F7).
Chapter 13. SMBus Controller Registers
Chapter 13 provides a detailed description of all registers that reside in the SMBus controller. This
controller resides at Device 31, Function 3 (D31:F3).
Chapter 14. AC ’97 Audio Controller Registers
Chapter 14 provides a detailed description of all registers that reside in the audio controller. This
controller resides at Device 31, Function 5 (D31:F5). Note that this chapter of the datasheet does
not include the native audio mixer registers. Accesses to the mixer registers are forwarded over the
AC-link to the codec where the registers reside.
Chapter 15. AC ’97 Modem Controller Registers
Chapter 15 provides a detailed description of all registers that reside in the modem controller. This
controller resides at Device 31, Function 6 (D31:F6). Note that this chapter of the datasheet does
not include the modem mixer registers. Accesses to the mixer registers are forwarded over the AC-
link to the codec where the registers reside.
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Intel^® 82801DB ICH4 Datasheet