82G33 datasheet(256/437 Pages) INTEL

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Integrated Graphics Device Registers (D2:F0,F1)

(Intel® 82Q35, 82Q33, 82G33 GMCH Only)

256

Datasheet

Bit

Access &

Default

Description

7:4

0011b

Graphics Mode Select (GMS): This field is used to select the

amount of Main Memory that is pre-allocated to support the Internal

Graphics device in VGA (non-linear) and Native (linear) modes. The

BIOS ensures that memory is pre-allocated only when Internal

graphics is enabled.

0000 = No memory pre-allocated. Device 2 (IGD) does not claim

VGA cycles (Memory and I/O), and the Sub-Class Code field

within Device 2 function 0 Class Code register is 80.

0001 = DVMT (UMA) mode, 1 MB of memory pre-allocated for frame

buffer.

0010 = DVMT (UMA) mode, 4 MB of memory pre-allocated for frame

buffer.

0011 = DVMT (UMA) mode, 8 MB of memory pre-allocated for frame

buffer.

0100 = DVMT (UMA) mode, 16 MB of memory pre-allocated for

frame buffer.

0101 = DVMT (UMA) mode, 32 MB of memory pre-allocated for

frame buffer.

0110 = DVMT (UMA) mode, 48 MB of memory pre-allocated for

frame buffer.

0111 = DVMT (UMA) mode, 64 MB of memory pre-allocated for

frame buffer.

1000 = DVMT (UMA) mode, 128 MB of memory pre-allocated for

frame buffer.

1001 = DVMT (UMA) mode, 256 MB of memory pre-allocated for

frame buffer.

Note: This register is locked and becomes Read Only when the

D_LCK bit in the

SMRAM register is set.

BIOS Requirement: BIOS must not set this field to 000 if IVD (bit 1

of this register) is 0.

3:0

0000b

Reserved

82G33 Datasheet(PDF) 256 Page - Intel Corporation

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