Compaq W4000 User Manual
Page 59
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 Acc
ess
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
2 2
IDSEL (only one signal li
F8h
R
NOTES:
e
1
e 1
ycle only. Reserved on Ty
cy
stined fo
if it is
m
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
1 1
8 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