Intel E3-1275 Datasheet download pdf (Page 52)

Processor Configuration Registers

52 Datasheet, Volume 2

2.5.5 RID—Revision Identification Register

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.

Stepping Revision ID (SRID)

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.

Compatible Revision ID (CRID)

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.

B/D/F/Type: 0/0/0/PCI

Address Offset: 8h

Reset Value: 00h

Access: RO-FW

Size: 8 bits

Bit Attr

Reset

Value

RST/

PWR

Description

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 Intel

Xeon

Processor E3-1200 Family Specification Update for the value of the

RID register.

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 299 300

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Intel E3-1275 Datasheet Page 52