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Technical Reference Guide
device being serviced by that bridge or it
ined for a device being serviced by a
on cycle nd e loa g
e PCI bus. The D
be asserted high for the IDSEL signal, which
be con unctio er
thin a PC
I bridge
r a
i
o
ation of device numb
omponents and slots residing on a PCI bus.
ration Access
Table 4-1.
guration Access
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 PC
may convert a Type 1 to a Type 0 if it’s de
ay forward the Type 1 cycle unmodified dest
ow bri c
CF8h res iguration cycle on th
etermines which one of the AD31..11 line
a ct n I
its <10..8>) i elect a particular f on wi
igure 4-2. Configuration Cycle
AD31..0
(w/Type 00
C
s
ber
22
IDSEL (only one signal li
F8h
R
NOTES:
e 1 e 1
ycle only. Reserved on Ty cy
stined fo
if it ism
d nstream dge. Figure 4-2 shows the onfigurat format a how th din of
0 ults in a Type 0 conf evice Number (bits <15..11>
d s is to
acts as “chip sele ” functio for the PC device t figured. The f n numb (CF8h,
b s used to s uncti I component.
3
Devic
Numb
1
1
e Function Register
er Number Index
118 7 2 1 0 [1]
Bu
Num
Reserved
Register 0C
esults in:
ne asser
tion
er
R
ted)
Func
Numb
egister
Index
onfig. Cycle)
[1] Bits <1,0> : 00 = Typ
Type 01 c
0 Cycle, 0 = Typ
pe 00
cycle
cle.
F
Table 4-1 shows the standard configur ers and IDSEL connections for
c
Table 4-1. PCI Device Configu
PCI Component Confi
PCI Component
Notes
Function #
Device #
PCI
Bus #
IDSEL
Wired to:
82845 MCH:
Memory Controller
AGP Bridge
0
0
0 (00h)
1 (01h)
0
0
--
AGP slot 0 0 (00h) 1 --
82801BA ICH2:
PCI Bridge
0
LPC Bridge
0
EIDE Controller
USB I/F #1
SMBus Co
Controller
oller
face Controller
[1]
1
2
5
30 (1Eh)
31 (1Fh)
31 (1Fh)
31 (1Fh)
31 (1Fh)
31 (1Fh)
0
0
0
0
0
0
0
0
2
--
ntroller
3
USB I/F #2
AC97 Audio
AC97 Modem Contr
Network Inter
4
6
0
31 (1Fh)
31 (1Fh)
8 (08h)
PCI Connector 1 (slot 1) [2] 0 4 (04h) 2 AD20
PCI Connector 2 (slot 2) [2] 2 AD25 0 9 (09h)
PCI Connector 3 (slot 3) [2, 3] ) 2 AD26 0 10 (0Ah
PCI Connector 4 (slot 4) [2, 4] 2 AD27 0 11 (0Bh)
PCI Connector 5 (slot 5) [2, 4] ) 2 AD29 0 13 (0Dh
OTES:
[1] Not implement
[2] PCI bus number giv
N
ed.
en is for standard configuration.
er models only.
rable minitower models only.
[3] Desktop and Configurable Minitow
[4] Configu
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition - January 2003
4-5