82443BX Datasheet, PDF (39/132 Pages) Intel Corporation – Host Bridge/Controller

Register Description
3.3.5
3.3.6
3.3.7
RID—Revision Identification Register (Device 0)
Address Offset:
Default Value:
Access:
Size:
08h
02h
Read Only
8 bits
This register contains the revision number of the 82443BX Function #0. These bits are read only
and writes to this register have no effect.
Bit
Description
Revision Identification Number. This is an 8-bit value that indicates the revision identification
7:0
number for the 82443BX Function #0.
B-1 = 02h
SUBC—Sub-Class Code Register (Device 0)
Address Offset:
Default Value:
Access:
Size:
0Ah
00h
Read Only
8 bits
This register contains the Sub-Class Code for the 82443BX Function #0. This code is 00h
indicating a Host Bridge device. The register is read only.
Bit
Description
7:0
Sub-Class Code (SUBC). This is an 8-bit value that indicates the category of Bridge into which
the 82443BX falls. The code is 00h indicating a Host Bridge.
BCC—Base Class Code Register (Device 0)
Address Offset:
Default Value:
Access:
Size:
0Bh
06h
Read Only
8 bits
This register contains the Base Class Code of the 82443BX Function #0. This code is 06h
indicating a Bridge device. This register is read only.
Bit
Description
7:0
Base Class Code (BASEC). This is an 8-bit value that indicates the Base Class Code for the
82443BX. This code has the value 06h, indicating a Bridge device.
82443BX Host Bridge Datasheet
3-13