Intel® Pentium® Silver and Intel® Celeron® Processors

Datasheet, Volume 1 of 2

ID 633935
Date 12/27/2022
Document Table of Contents
DSP

CPU And Device IDs

CPUID Format

SKU CPUID Reserved [31:28] Extended Family [27:20] Extended Model [19:16] Reserved [15:14] Processor Type [13:12] Family Code [11:8] Model Number [7:4] Stepping Value/ID [3:0]
A step 906C0h Reserved 0000000b 1001 Reserved 00b 0110b 1100b 0000b
  • The Extended Family, Bits [27:20] are used in conjunction with the Family Code, specified in Bits[11:8], to indicate whether the processor belongs to the Intel386™, Intel486™, Pentium, Pentium 4, or Intel Core™ processor family
  • The Extended Model, Bits [19:16] in conjunction with the Model Number, specified in Bits [7:4], are used to identify the model of the processor within the processor's family.

  • The Family Code corresponds to Bits [11:8] of the EDX register after RESET, Bits [11:8] of the EAX register after the CPUID instruction is executed with a 1 in the EAX register, and the generation field of the Device ID register accessible through Boundary Scan.
  • The Model Number corresponds to Bits [7:4] of the EDX register after RESET, Bits [7:4] of the EAX register after the CPUID instruction is executed with a 1 in the EAX register, and the model field of the Device ID register accessible through Boundary Scan.
  • The Stepping ID in Bits [3:0] indicates the revision number of that model.
  • When EAX is initialized to a value of '1', the CPUID instruction returns the Extended Family, Extended Model, Processor Type, Family Code, Model Number and Stepping ID value in the EAX register. Note that the EDX processor signature value after reset is equivalent to the processor signature output value in the EAX register.