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參數(shù)資料
| 型號(hào)： | AM486 |
| 英文描述： | Am486 Microprocessor Software User＇s Manual? 4.40MB (PDF) |
| 中文描述： | Am486微處理器軟件用戶(hù)手冊(cè)？ 4.40MB（PDF格式） |
| 文件頁(yè)數(shù)： | 38/52頁(yè) |
| 文件大小： | 1242K |
| 代理商： | AM486 |
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38
Am486DE2 Microprocessor
CPUID Operation
The CPUID instruction requires the user to pass an input
parameter to the CPU in the EAX register. The CPU
response is returned to the user in registers EAX, EBX,
ECX, and EDX.
When the parameter passed in EAX is zero, the register
values returned upon instruction execution are:
EAX[31:0]
EBX[31:0]
ECX[31:0]
EDX[31:0]
The values in EBX, ECX, and EDX indicate an AMD
microprocessor. When taken in the proper order:
I
EBX (least significant bit to most significant bit)
I
EDX (least significant bit to most significant bit)
I
ECD (least significant bit to most significant bit)
they decode to:
‘AuthenticAMD’
When the parameter passed in EAX is 1, the register
values returned are:
EAX[3:0]
Stepping ID*
EAX[7:4]
Model:
Am486DE2CPU—
Write-through mode = 3h
Family
Am486 CPU = 4h
EAX[15:12]
0000
EAX[31:16]
RESERVED
EBX[31:0]
00000000h
ECX[31:0]
00000000h
EDX[31:0]
00000001h = all versions
The 1 in bit 0 indicates that the
FPU is present
Note:
*Please contact AMD for stepping ID details.
The value returned in EAX after CPUID instruction ex-
ecution is identical to the value loaded into EDX upon
device reset. Software must avoid any dependency
upon the state of reserved processor bits.
When the parameter passed in EAX is greater than one,
register values returned upon instruction execution are:
Table 14. CPUID Instruction Description
OP
Code
Instruction
EAX
Input
Value
0
1
>1
CPU
Core
Clocks
41
14
9
Description
0F A2 CPUID
AMD string
CPU ID Register
null registers
00000001h
68747541h
444D4163h
69746E65h
EAX[11:8]
EAX[31:0]
EBX[31:0]
ECX[31:0]
EDX[31:0]
Flags affected
: No flags are affected.
Exceptions
: None
00000000h
00000000h
00000000h
00000000h
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