Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

16.1.17. MEM_MODE—Memory Interface Mode Register (debug)

Address Offset:

 

020DCh

 

 

 

 

 

Default Value:

 

00000000h

 

 

 

 

 

Access:

 

 

 

Read/Write

 

 

 

 

 

Size:

 

 

 

32 bits

 

 

 

 

 

15

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

6

5

4

3

2

1

0

 

 

 

Other Local Cache

Host

Reserved

 

Reserved

Graphics

Enable

 

 

 

 

Modes

Graphics

 

 

 

Address

Instruction

 

 

 

 

 

 

Prefetch

 

 

 

Translatio

FIFO

 

 

 

 

 

 

Enable

 

 

 

n Mode

Debug

 

 

 

 

 

 

 

 

 

 

(Pg Tbl

Mode

 

 

 

 

 

 

 

 

 

 

test mode)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

31:6

Reserved.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

Host Graphics Prefetch Mode,

 

 

 

 

 

 

 

 

0

= Enable

 

 

 

 

 

 

 

 

 

 

1

= Disable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4:3

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

Reserved. MUST BE SET TO 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

Graphics Address Translation Mode.

 

 

 

 

 

 

 

 

0

= Graphics Address translated through page table (Page Table test mode)

 

 

 

 

 

1

= Graphics address = Physical address in Local memory. (Not supported in the GMCH)

 

 

 

 

 

 

 

 

 

 

0

Instruction FIFO Debug Mode.

 

 

 

 

 

 

 

 

0

= Disable

 

 

 

 

 

 

 

 

 

 

1

= Enable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

319

Page 319
Image 319
Intel 815 MEMMODE-Memory Interface Mode Register debug, Reserved Host Graphics Prefetch Mode, Instruction Fifo Debug Mode