Datasheet
Datasheet, Volume 2 177
Processor Configuration Registers
2.13.5 RID2—Revision Identification Register
This register contains the revision number for Device 2, Functions 0 and 1.
This register contains the revision number of the processor. The Revision ID (RID) is a
traditional 8-bit Read Only (RO) register located at offset 08h in the standard PCI
header of every PCI/PCI Express compatible device and function.
2.13.6 CC—Class Code Register
This register contains the device programming interface information related to the Sub-
Class Code and Base Class Code definition for the IGD. This register also contains the
Base Class Code and the function sub-class in relation to the Base Class Code.
B/D/F/Type: 0/2/0/PCI
Address Offset: 8h
Reset Value: 08h
Access: RO
Bit Attr
Reset
Value
Description
7:0 RO 08h
Revision Identification Number (RID)
This is an 8-bit value that indicates the revision identification number for the
processor Device 0. Refer to the Intel
®
Core™ i5-600 and i3-500 Desktop
Processor Series and Intel
®
Pentium
®
Desktop Processor 6000 Series
Speci
fication Update for the value of the Revision ID Register.
B/D/F/Type: 0/2/0/PCI
Address Offset: 9–Bh
Reset Value: 030000h
Access: RO
Bit Attr
Reset
Value
Description
23:16 RO 03h
Base Class Code (BCC)
This is an 8-bit value that indicates the base class code for the processor.
This code has the value 03h, indicating a Display Controller.
When MCHBAR offset 44 bit 31 is 0 this code has the value 03h, indicating a
Display Controller.
When MCHBAR offset 44 bit 31 is 1 this code has the value 04h, indicating a
Multimedia Device.
15:8 RO 00h
Sub-Class Code (SUBCC)
When MCHBAR offset 44 bit 31 is 0 this value will be determined based on
Device 0 GGC register, GMS and IVD fields.
00h = VGA compatible
80h = Non VGA (GMS = "0000" or IVD = "1")
When MCHBAR offset 44 bit 31 is 1 this value is 80h, indicating other
multimedia device.
7:0 RO 00h
Programming Interface (PI)
When MCHBAR offset 44 bit 31 is 0 this value is 00h, indicating a Display
Controller.
When MCHBAR offset 44 bit 31 is 1 this value is 00h, indicating a NOP.