Datasheet

Datasheet 63

4.8.5 RID – Register Identification

Address Offset: 08h

Default Value: 02h

Access: Read Only

Size: 8 bits

This register contains the revision number of the GMCH Device #0. These bits are read only and

writes to this register have no effect.

Bit Description

7:0 Revision Identification Number (RID): This is an 8-bit value that indicates the revision identification

number for the GMCH Device #0.

4.8.6 SUBC – Sub Class Code Register

Address Offset: 0Ah

Default Value: 00h

Access: Read Only

Size: 8 bits

This register contains the Sub-Class Code for the GMCH Device #0. This code is 00h indicating a

Host Bridge device.

Bit Description

7:0 Sub-Class Code (SUBC): This is an 8-bit value that indicates the category of Bridge into which the

GMCH falls. The code is 00h indicating a Host Bridge.

4.8.7 BCC – Base Class Code Register

Address Offset: 0Bh

Default Value: 06h

Access: Read Only

Size: 8 bits

This register contains the Base Class code of the GMCH Device #0. This code is 06h indicating a

Bridge device.

Bit Description

7:0 Base Class Code (BASEC): This is an 8-bit value that indicates the Base Class Code for the GMCH.

This code has the value 06h, indicating a Bridge device.