Compaq W4000 Manual De Usuario
Chapter 4 System Support
Figure 4-7. AGP 4X Data Transfer (Peak Transfer Rate: 1064 MB/s)
4.3.2 AGP CONFIGURATION
qu
the configuration of certain parameters involvin
em memory
c adapter. The AGP bus interface is configured as a PCI device
s, from the
I
NOTE: Configuration of the AGP bus interface involves functions 0 and 1 of the
AGP bus operations re
ccess by the AGP grap
ire
s
g syst
a
hi
integrated within the nort
CI bus perspective, tr
onfiguration registers
h bridge (MCH, device 1) component. The AGP function i
eated essentially as a PCI/PCI bridge and configured through PC
(Table 4-6). Configuration is accomplished by BIOS during POST.
P
c
c
MCH. Function 0 registers (listed in Table 3-4) include functions that affect basic
control (GART) of the AGP.
control (GART) of the AGP.
ion 1)
Table 4-6. PCI/AGP Bridge Configuration Registers (MCH, Funct
Table 4-6.
PCI/AGP
ge
n C
tion
gi
, Fun
Brid Functio
onfigura
Re sters
(MCH
ction 1)
PCI
fig
r.
r.
Regis
P
C
A
C
A
R
ste
Reset
Value
Value
Con
.
Add
ter
Reset
Value
Value
CI
onfig.
ddr.
ddr.
egi
r
00, 01h
Vend
h
1
Sec. Master Latency T
00h
or ID
8086
Bh
imer
02, 03h
evic
1
I/O Base Address
F0h
D
e ID
1131h
Ch
04, 05h
Comm
1
I/O Limit Address
00h
and
0000h
Dh
06, 07h
Statu
h
1E, 1Fh
Sec. PCI/PCI Status
s
0020
02A0h
08h
Revision ID
2
Memory
dress
00h
0, 21h
Base Ad
FFF0h
0A, 0B
Class Code
2
Memory
ddress
0000h
h
0406h
2, 23h
Limit A
0Eh
Head
2
P
tch
se A
er Type
01h
4, 25h
refe
Mem. Ba
ddr.
FFF0h
18h
Prima
Numbe
2
P
tch
mit A
ry Bus
r
00h
6, 27h
refe
Mem. Li
ddr.
0000h
19h
Secon
Bus Number
3
P
CI
ontro
00h
dary
00h
Eh
CI/P Bridge C
l
1Ah
Subordinate Bus Number
3F-FFh
R
rve
h
00h
ese
d
00
Assum
arked l
s/ga as reser
Refer to
cum tation fo
ed
register d
riptions.
dapter (act ally
resident
troller) is c figu d as a st
rd PCI
NOTE:
e unm
ocation
ps
ved.
Intel do
en
r detail
esc
The AGP graphics a
u
its
con
on
re
anda
device.
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition – January 2003
4-14