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Chapter 4 System Support
T
Not required
Figure 4-3. PCI Configuration Space Mapping
Data required by PCI protocol
he register index (CF8h, bits <7..2>) identifies the 32-bit location within the configuration space
ach PCI device is identified with a vendor ID (assigned to the vendor by the PCI Special Interest
Group) and a device ID (assigned by the vendor). The device and vendor IDs for the devices on
the system board are listed in Table 4-2.
Table 4-2. System Board PCI Device Identification
Table 4-2.
System Board PCI Device Identification
of the PCI device to be accessed. All PCI devices can contain up to 256 bytes of configuration
data (Figure 4-3), of which the first 64 bytes comprise the configuration space header.
31 24 23 16 15 8 7 0
Ex
p
ansion ROM Base Address
Device-Specific Area
Int. Line Int. Pin Brid
g
e Control
Register
Index
FCh
3Ch
38h
34h
40h
24 23 16 15 8 7 0
Reserved
Reserved
Device-Specific Area
Int. Line Int. Pin Min. GNT in. Lat.
I/O Limit
2Ch
30h
Subs
y
stem Vendor ID Subs
y
stem ID
Ex
p
ansion ROM Base Address
Devi
PCI Configuration Space Type 0
E
Configuration
Space
Header
PCI Configuration Space Type 1
Cla
Status
BIST Hd
Sub. Bus # 2
n
d
Lat.Tmr
ondar
y
Status
1Ch
10h
Bas
Status
IST Hdr. T
Class
Base Address Regist s er
ss Code
Command
Revision ID
Vendor ID Device ID
Reserved
Prefetchable Limit U
pp
er 32 Bits
Prefetch. Mem. Limit Prefetch. Mem. Base
Prefetchable Base U
pp
er 32 Bits
Line Size Lat. Timer r. T
yp
e
Pri. Bus # Sec. Bus #
00h
Register
Index
04h
08h
0Ch
2Ch
30h
FCh
18h
28h
3Ch
38h
34h
40h
I/O Base U
pp
er 16 Bits
Upper 16 Bits
24h
20h
Memor
y
Base Memor
y
Limit
I/O Base I/O Limit Sec
e Address Registers
00h
04h
08h
0Ch
10h
28h
Command
31
Revision ID
Vendor ID ce ID
Card Bus CIS Pointer
Line Size Lat. Timer B
yp
e
Code
M
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition – January 2003
4-6
PCI Device Vendor ID Device ID
82845 MCH:
Memory Controller
AGP Bridge
8086h
8086h
1A30h
1A31h
82801 ICH2:
PCI Bridge
LPC Bridge
EIDE Controller
USB I/F #2
SMBus Controller
AC97 Audio Controller
Network Interface Controller
8086h
8086h
8086h
8086h
8086h
8086h
8086h
244Eh
2440h
244Bh
2444h
(Hidden)
2445h
2449h