Intel G640T CM8062301002204 User Manual

52

Datasheet, Volume 2

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

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. Following reset, the 
SRID is returned when the RID is read at offset 08h. The SRID value reflects the actual 
product stepping. To select the CRID value, BIOS/configuration software writes a key 
value of 69h to Bus 0, Device 0, Function 0 (DMI device) of the processor RID register 
at offset 08h. This causes the CRID to be returned when the RID is read at offset 08h.

This register contains the revision number of the processor. The SRID is a 8-bit 
hardwired value assigned by Intel, based on product stepping. The SRID is not a 
directly addressable PCI register. The SRID value is reflected through the RID register 
when appropriately addressed.

The CRID is an 8-bit hardwired value assigned by Intel during manufacturing process. 
Normally, the value assigned as the CRID will be identical to the SRID value of a 
previous stepping of the product with which the new product is deemed “compatible”. 
The CRID is not a directly addressable PCI register. The CRID value is reflected through 
the RID register when appropriately addressed.

7:0

RO-FW

00h

Uncore

Revision Identification Number (RID)
This is an 8-bit value that indicates the revision identification 

number for the Processor Device 0. Refer to the 2nd Generation 

Desktop Specification Update for the value of the RID register.