82443GX Datasheet, PDF (33/128 Pages) Intel Corporation – Intel 440GX AGPset: 82443GX Host Bridge/Controller

Register Description
Table 3-1. 82443GX Register Map — Device 0 (Sheet 2 of 2)
Address
Offset
Register
Symbol
80–83h
84–8Fh
90h
91–92h
93h
94–97h
98–99h
9Ah
9B–9Fh
EAP
—
ERRCMD
ERRSTS
—
—
—
—
—
Register Name
Error Address Pointer Register
Reserved
Error Command Register
Error Status Register
Reserved
Intel Reserved
Intel Reserved
Intel Reserved
Reserved
A0–A3h ACAPID
AGP Capability Identifier
A4–A7h
A8–ABh
AC–AFh
B0–B3h
B4h
B5–B7h
B8–BBh
BCh
BDh
BE–BFh
C0–C3h
C4–C7h
C8h
C9h
CA–CCh
CD–CFh
D0–D7h
D8–DFh
E0–E7h
E8–EFh
F0–F1h
F2–F7h
F8–FBh
FC–FFh
AGPSTAT
AGPCMD
—
AGPCTRL
APSIZE
—
ATTBASE
—
—
—
—
—
—
—
MBFS
—
BSPAD
DWTC
DRTC
BUFFC
—
—
—
AGP Status Register
AGP Command Register
Reserved
AGP Control Register)
Aperture Size Control Register
Reserved
Aperture Translation Table
Reserved
Reserved
Reserved
Intel Reserved
Intel Reserved
Intel Reserved
Intel Reserved
Memory Buffer Frequency Select
Reserved
BIOS Scratch Pad
Intel Reserved
DRAM Write Thermal Throttling Control
DRAM Read Thermal Throttling Control
Buffer Control Register
Intel Reserved
Intel Reserved
Intel Reserved
Default Value
Access
00000000h
00h
80h
0000h
00h
00006104h
0500h
00h
—
00100002h
00000000h
1F000203h
00000000h
00h
00000000h
00h
00h
00000000h
—
—
00h
00000000h
00000000h
18h
0Ch
000000h
00h
00...00h
000....000h
000....000h
000....000h
0000h
0000F800h
00000F20h
00000000h
RO, R/WC
—
R/W
R/WC, RO
R/W
—
—
—
—
RO
RO
RW
—
R/W
R/W
—
R/W
—
—
—
—
—
—
—
R/W
—
R/W
—
R/W/L
R/W/L
R/W/L
—
—
—
NOTES:
1. The ‘S’ symbol represents the strapping option.
2. Write operations must not be attempted to the Intel Reserved registers.
82443GX Host Bridge Datasheet
3-9