STG3005A2STR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STG3005A2STR

128-BIT 3D MULTIMEDIA ACCELERATOR

STMicroelectronics 

RIVA128ZX

128-BIT 3D MULTIMEDIA ACCELERATOR

Byte offsets 0x0B - 0x08

0x0B

0x0A

0x09

0x08

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Class Code Register (0x0B - 0x09)

Bits Function

31:8 The CLASS_CODE bits identify the generic function of the device and (in

some cases) a specific register-level programming interface. The register is

broken into three byte-size fields. The upper byte (at offset 0x0B) is a base

class code which broadly classifies the type of function the device performs.

The middle-byte (at offset 0x0A) is a sub-class code which identifies more

specifically the function of the device. The lower byte (at offset 0x09) identifies

a specific register-level programming interface (if any) so that device indepen-

dent software can interact with the device.

The VGA function responds as a VGA compatible controller.

0x030000=VGA compatible controller

Revision Identification Register (0x08)

Bits Function

7:0

The REVISION_ID bits specify a device specific revision identifier. The value

is chosen by the vendor. This field should be vie wed as a vendor defined

extension to the DEVICE_ID.

0x01=Revision B

RWI

R -X

RWI

R-X

72/85

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