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Embedded AMD Processor Recognition
Embedded AMD-K6™ Processors BIOS Design Guide
23913A/0—November 2000
Preliminary Information
All AMD-K6 processor models belong to instruction family 5 (as
returned in EAX by function 1). All AMD Athlon™ processor
models belong to instruction family 6 (as returned in EAX by
function 1).
Figure 29 shows the contents of the EAX register obtained by
function 1. Table 29 summariz es the specific processor
signature values returned for AMD processors.
Figure 29. Contents of EAX Register Returned by Function 1
Instruction Family
11–8
Model
7–4
Stepping
3–0
12 11
7
3
0
31
Reserved
4
8
Table 29.
Processor Signatures for AMD-K6™ Processors
Processor
Instruction
Family
Model
Stepping ID
1
AMD-K6E Processor (Model 7)
0101b (5h)
0111b (7h)
xxxx
AMD-K6-2 Processor (Model 8)
AMD-K6-2E Processor (Model 8)
0101b (5h)
1000b (8h)
xxxx
AMD-K6-
III
Processor (Model 9)
0101b (5h)
1001b (9h)
xxxx
AMD-K6-2E+ Processor (Model D)
AMD-K6-
III
E+ Processor (Model D)
0101b (5h)
1101b (Dh)
xxxx
Notes:
1. Contact your AMD representative for the latest stepping information. Refer to Table 1 on page 2 for the range of allowable stepping IDs
associated with each model number.