Pci Bus Overview - HP Compaq d330 DT Technical Reference Manual

Chapter 4 System Support
4.2

PCI BUS OVERVIEW

NOTE: This section describes the PCI bus in general and highlights bus
implementation in this particular system. For detailed information regarding PCI bus
operation, refer to the PCI Local Bus Specification Revision 2.3.
These systems implement a 32-bit Peripheral Component Interconnect (PCI) bus (spec. 2.3)
operating at 33 MHz. The PCI bus handles address/data transfers through the identification of
devices and functions on the bus. A device is typically defined as a component or slot that resides
on the PCI bus (although some components such as the GMCH and ICH5 are organized as
multiple devices). A function is defined as the end source or target of the bus transaction. A
device may contain one or more functions. In the standard configuration these systems use a
hierarchy of three PCI buses (Figure 4-1). The PCI bus #0 is internal to the chipset components
and is not physically accessible. The AGP bus that services the AGP slot (if present) is designated
as PCI bus #1. All PCI slots and the NIC function internal to the ICH5 reside on PCI bus #2.
82865G GMCH Component
Mem. Cntlr.
Function
Hub Link I/F
Hub Link Bus
Hub Link I/F
PCI Bridge
Function
PCI
Bus #5
PCI
Bus #5
NOTES:
[1] ST, SFF, DT, MT, & CMT form factors
[2] ST, DT, MT, & CMT fo
[3] CMT form factor only.
Not used in these systems.
Figure 4-1. PCI Bus Devices and Functions
4-2 hp compaq d330 and d530 Series of Personal Computers
Featuring the Intel Pentium 4 Processor
Integrated
PCI
Graphics
Bus #0
Controller
EIDE
Controller
Function
NIC
I/F
Function
PCI Connector 1
PCI Connector 2 [1]
Broadcom
B CM
NIC
rm factors only.
First Edition – June 2003
PCI Bus #1
AGP
(AGP Bus)
Bridge
Function
82801EB ICH5 Component
PCI Bus #0
SATA USB #1-4
Controller & 2.0
Function Functions
PCI Connector 3 [2 ]
only.
AGP Connector [1]
SMBus LPC
Controller Bridge
Function Function
PCI Connector 4 [3]
PCI Connector 5 [3]
AC97
Audio
Function