5 rid - register identification, 6 subc - sub class code register, Rid – register identification – Intel D15343-003 User Manual

Page 54: Subc – sub class code register, 5 rid – register identification, 6 subc – sub class code register

Intel

82854 Graphics Memory Controller Hub (GMCH)

D15343-003

4.8.5

RID – Register Identification

This register contains the revision number of the GMCH Device #0. These bits are read only and
writes to this register have no effect.

4.8.6

SUBC – Sub Class Code Register

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

Address Offset:
Default Value:
Access:
Size:

08h
02h
Read only
8 bits

Bit

Descriptions

7:0

Revision Identification Number (RID):

This is an 8-bit value that indicates the revision

identification number for the GMCH Device #0.

Address Offset:
Default Value:
Access:
Size:

0Ah
00h
Read only
8 bits

Bit

Descriptions

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.