STG3005A2STR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STG3005A2STR

128-BIT 3D MULTIMEDIA ACCELERATOR

STMicroelectronics 

RIVA128ZX

128-BIT 3D MULTIMEDIA ACCELERATOR

Byte offsets 0x43 - 0x40

0x43

0x42

0x41

0x40

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

Writeable Subsystem Vendor ID (0x43 - 0x40)

Bits

31:16

15:0

Function

This SUBSYSTEM_ID field is aliased at 0x2F - 0x2E where it is read-only. It

may be modified by System BIOS for systems which do not have a ROM on

the RIVA128ZX data pins. This will ensure valid data before enumeration by

the operating system.

This SUB_VENDOR_ID field is aliased at 0x2D - 0x2C where it is read-only. It

may be modified by System BIOS for systems which do not have a ROM on

the RIVA128ZX data pins. This will ensure valid data before enumeration by

the operating system.

RWI

RW0

RW0

Byte offsets 0x47 - 0x44

0x47

0x46

0x45

0x44

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

Capabilities Identifier Register (Offset = 0x47 - 0x44 = CAP_PTR)

Bits

31:24

23:20

19:16

15:8

7:0

Function

Reserved = 0x00

This field indicates the Major revision number of the AGP specification that

the RIVA128ZX conforms to.

= 0x01

This field indicates the Minor revision number of the AGP specification that

the RIVA128ZX conforms to.

= 0x00

NEXT_PTR contains the pointer to the next item in the capabilities list. This is

the last entry in the capabilities list, hence it contains a null pointer = 0x00.

The CAP_ID field identifies the type of capability.

AGP = 0x02

RWI

R-0

R - 0x01

R - 0x00

R - 0x00

R - 0x02

80/85

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