Datasheet

Intel
®
E8870 Scalable Node Controller (SNC) Datasheet 3-5
Configuration Registers
3.5.2 DID: Device Identification Register
This register combined with the Vendor Identification register uniquely identifies the SNC. Writes
to this register have no effect.
3.5.3 CCR: Class Code Register
This register contains the Class Code for the SNC, specifying the device function.
Device: NodeID
Function: 0,1,2,3
Offset: 02 - 03h
Bit Attr Default Description
15:0 RO
Fixed Value
(see Description)
Device Identification Number
Identifies each function of the SNC.
0500h: SNC Function0
0501h: SNC Function1
0502h: SNC Function2
0503h: SNC Function3
0508h: Reserved
0509h: Reserved
050Ah: Reserved
050Bh: Reserved
Device: NodeID
Function: 0,1,2,3
Offset: 09-0Bh
Bit Attr Default Description
23:16 RO 06h
Base Class
This field indicates the general device category. For the SNC, this field is
hardwired to 06h, indicating it is a “Bridge Device.”
15:8 RO 0
Sub-Class
This field qualifies the Base Class, providing a more detailed
specification of the device function. For the SNC, this field is hardwired
to 00h, indicating it is a “Host Bridge.”
7:0 RO 0
Register-Level Programming Interface
This field identifies a specific programming interface that device
independent software can use to interact with the device. There is no
such interfaces defined for host bridge, and this field is hardwired to 00h.