Chapter 4 System Support
or it
>
ion number (CF8h,
bers and IDSEL connections for
Table 4-1. PCI Device Conf
PCI C ent ion Ac
Two types of configuration cycles are used. A Type 0 (zero) cycle is targeted to a device on the
PCI bus on which the cycle is running. A Type 1 cycle is targeted to a device on a downstream
PCI bus as identified by bus number bits <23..16>. With three or more PCI buses, a PCI bridge
may convert a Type 1 to a Type 0 if it’s destined for a device being serviced by that bridge
may forward the Type 1 cycle unmodified if it is destined for a device being serviced by a
downstream bridge. Figure 4-2 shows the configuration cycle format and how the loading of
0CF8h results in a Type 0 configuration cycle on the PCI bus. The Device Number (bits <15..11
determines which one of the AD31..11 lines is to be asserted high for the IDSEL signal, which
acts as a “chip select” function for the PCI device to be configured. The funct
bits <10..8>) is used to elect a particul nction wit n a PCI m .
fig. Cycle)
Reserved
Number
Register
Index
3
22
1 1 [1]
IDSEL (only one signal line asserted)
Number
Register
Index
Register 0CF8h
Results in:
NOTES:
[1] Bits <1,0> : 00 = Type 0 Cycle, 01 = Type 1 cycle
ed on Type 00 cycle.
Number Number
s ar fu hi co ponent
1
Bus
Figure 4-2. Configuration Cycle
Table 4-1 shows the standard configuration of device num
components and slots residing on a PCI bus.
iguration Access
Table 4-1.
ompon Configurat cess
PCI Component
Notes
Function #
Dev #
PCI
Bus #
IDSEL
Wired to: ice
82865G GMCH:
dge
phics Controller
--
Memory Controller
AGP Bri
Integrated Gra
0
0
0
0
1
2
0
0
0
AGP slot 0 0 1 --
82801EB ICH5
PCI Bridge
LPC Bridge
EIDE Controller
Serial ATA Controller
roller
r
roller
--
SMBus Cont
USB I/F #1
USB I/F #2
USB I/F #3
USB I/F #4
USB 2.0 Controller
AC97 Audio Controller
AC97 Modem Controlle
Network Interface Cont
0
0
1
2
3
0
1
2
3
7
5
6
0
30
31
31
31
31
29
29
29
29
29
31
31
8
0
0
0
0
0
0
0
0
0
0
0
0
5
PCI Connector 1 (slot 1) 0 4 5 AD20
PCI Connector 2 (slot 2) [1] 0 9 5 AD25
PCI Connector 3 (slot 3) [2] 0 10 5 AD26
PCI Connector 4 (slot 4) [3] 0 11 5 AD27
PCI Con 0 13 5 AD29 nector 5 (slot 5) [3]
N
[1] ST, SFF, DT, MT, & CM
OTES:
T form factors only.
T, DT, MT, & CMT form factors only.
[3] CMT form factor only.
[2] S
AD31..0
(w/Type 00
Con
Function
87 2 1 01
Device
Function
Type 01 cycle only. Reserv
hp compaq d330 and d530 Series of Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition – June 2003
4-4
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