Register Description

R

Address

Register

Register Name

Default

Access

Offset

Symbol

 

Value

 

 

 

 

 

 

87–8Bh

Reserved.

 

 

 

 

 

8C–8Fh

EAP

Error Address Pointer

00000000h

RO

 

 

 

 

 

90–96h

PAM[0:6]

Programmable Attribute Map (7 Registers)

0000000000

RO, R/W

 

 

 

0000h

 

 

 

 

 

 

97h

FDHC

Fixed DRAM Hole Control

00h

R/W

 

 

 

 

 

98–9Ch

Reserved.

 

 

 

 

 

9Dh

SMRAM

System Management RAM Control

02h

RO, R/W,

 

 

 

 

R/W/L

 

 

 

 

 

9Eh

ESMRAMC

Extended System Mgmt RAM Control

38h

RO, R/W,

 

 

 

 

R/WC,

 

 

 

 

R/W/L

 

 

 

 

 

9Fh

Reserved.

 

 

 

 

 

A0–A3h

ACAPID

AGP Capability Identifier

00200002h

RO

 

 

 

 

 

A4–A7h

AGPSTAT

AGP Status

1F000216h

RO

 

 

 

 

 

A8–ABh

AGPCMD

AGP Command

00000000h

R/W

 

 

 

 

 

AC–AFh

Reserved.

 

 

 

 

 

B0–B3h

AGPCTRL

AGP Control

00000000h

R/W

 

 

 

 

 

B4h

APSIZE

Aperture Size

00h

R/W

 

 

 

 

 

B5–B7h

Reserved

 

 

 

 

 

B8–BBh

ATTBASE

Aperture Translation Table Base

00000000h

R/W

 

 

 

 

 

BCh

AMTT

AGP MTT Control

00h

R/W

 

 

 

 

 

BDh

LPTT

AGP Low Priority Transaction Timer

00h

R/W

 

 

 

 

 

BE–C3h

 

Reserved

 

 

 

 

 

 

 

C4–C5h

TOM

Top of Low Memory

0000h

R/W

 

 

 

 

 

C6–C7h

MCHCFG

MCH Configuration

0000h

R/W, RO

 

 

 

 

 

C8–C9h

ERRSTS

Error Status

0000h

R/WC

 

 

 

 

 

CA–CBh

ERRCMD

Error Command

0000h

R/W

 

 

 

 

 

CC–CDh

SMICMD

SMI Command

0000h

R/W

 

 

 

 

 

CE–CFh

SCICMD

SCI Command

0000h

R/W

 

 

 

 

 

D0–DDh

Reserved.

 

 

 

 

 

DE–DFh

SKPD

Scratchpad Data

0000h

R/W

 

 

 

 

 

E0–E3h

Reserved.

 

 

 

 

 

E4–E7h

CAPID

Product Specific Capability Identifier

F104A009h

RO

 

 

 

 

 

E8–FFh

Reserved.

 

 

 

 

 

44

Intel® 82845 MCH for SDR Datasheet

Page 44
Image 44
Intel 845 Eap, Fdhc, Smram, Esmramc, Acapid, Agpstat, Agpcmd, Agpctrl, Apsize, Attbase, Amtt, Lptt, Tom, Mchcfg, Errsts