Datasheet

Intel
®
Xeon
®
Processor 5600 Series Datasheet Volume 2 37
Register Description
2.5.1 DID - Device Identification Register
This 16-bit register combined with the Vendor Identification register uniquely identifies
the Function within the processor. Writes to this register have no effect. See Table 2-1
for the DID of each processor function.
2.5.2 RID - Revision Identification Register
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.
2.6 Generic Non-core Registers
2.6.1 DESIRED_CORES
Number of cores, threads BIOS wants to exist on the next reset. A processor reset
must be used for this register to take affect. Note programing this register to a value
higher than the product has cores, should not be done. Which cores are removed is not
Device: 0
Function: 0-1
Offset: 02h
Device: 2
Function: 0-5
Offset: 02h
Device: 3
Function: 0-2, 4
Offset: 02h
Device: 4-6
Function: 0-3
Offset: 02h
Bit Type
Reset
Value
Description
15:0 RO *See
Table 2-1
Device Identification Number
Identifies each function of the processor.
Device: 0
Function: 0-1
Offset: 08h
Device: 2
Function: 0-5
Offset: 08h
Device: 3
Function: 0-2, 4
Offset: 08h
Device: 4-6
Function: 0-3
Offset: 08h
Bit Type
Reset
Value
Description
7:0 RO 0h Revision Identification Number
0: A0 Stepping
1: B0 Stepping
2: B1 Stepping
Others: RSVD