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30141-23 参数 Datasheet PDF下载

30141-23图片预览
型号: 30141-23
PDF下载: 下载PDF文件 查看货源
内容描述: 的Geode ™ GXM处理器与MMX支持集成的x86解决方案 [Geode⑩ GXm Processor Integrated x86 Solution with MMX Support]
分类和应用: 微控制器和处理器外围集成电路微处理器
文件页数/大小: 244 页 / 4221 K
品牌: NSC [ National Semiconductor ]
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Instruction Set (Continued)  
9.2.2 Extended CPUID Levels  
Table 9-22. EAX, EBX, ECX CPUID Data  
Returned when EAX = 80000001h  
Testing for extended CPUID instruction support can be  
accomplished by executing a CPUID instruction with the  
EAX register initialized to 80000000h. If a value greater  
than or equal to 80000000h is returned to the EAX regis-  
ter by the CPUID instruction, the processor supports  
extended CPUID levels.  
Returned  
Register  
Contents  
Description  
Stepping ID  
EAX[3:0]  
EAX[7:4]  
EAX[11:8]  
EAX[15:12]  
EAX[31:16]  
EBX  
xx  
4
5
0
-
Model  
Family  
9.2.2.1 CPUID Instruction with  
Processor Type  
Reserved  
Reserved  
Reserved  
EAX = 8000000h  
Extended function 80000000h (EAX = 80000000h) of the  
CPUID instruction returns the maximum extended CPUID  
levels supported by the current processor in EAX (Table 9-  
21). The EBX, ECX, and EDX registers are currently  
reserved.  
-
ECX  
-
Table 9-23. EDX CPUID Data Returned  
when EAX = 80000001h  
Table 9-21. Maximum Extended CPUID Level  
Returned  
Contents*  
CR4  
Bit  
Returned  
Contents  
EDX  
Feature Flag  
FPU On-Chip  
Register  
Description  
EDX[0]  
EDX[1]  
EDX[2]  
EDX[3]  
1
0
0
0
-
-
-
-
EAX  
80000005h  
Maximum Extended CPUID  
Level (six levels)  
Virtual Mode Extension  
Debugging Extension  
EBX  
ECX  
EDX  
-
-
-
Reserved  
Reserved  
Reserved  
Page Size Extension  
(4 MB)  
EDX[4]  
EDX[5]  
1
1
Time Stamp Counter  
2
-
National Semiconductor  
Model-Specific Registers  
(via RDMSR / WRMSR  
Instructions)  
9.2.2.2 CPUID Instruction with  
EAX = 8000 0001h  
Extended function 80000001h (EAX = 80000001h) of the  
CPUID instruction returns the processor type, family,  
model, and stepping information of the current processor  
in EAX. The EBX and ECX registers are reserved.  
EDX[6]  
EDX[7]  
EDX[8]  
EDX[9]  
EDX[10]  
EDX[11]  
0
0
1
0
0
0
Reserved  
-
-
-
-
-
-
Machine Check Exception  
CMPXCHG8B Instruction  
Reserved  
The extended feature flags supported are returned in the  
EDX register as shown in Table 9-23. Each flag refers to a  
specific feature and indicates if that feature is present on  
the processor. Some of these features have protection  
control in CR4. Before using any of these features on the  
processor, the software should check the corresponding  
feature flag.  
Reserved  
SYSCALL / SYSRET  
Instruction  
EDX[12]  
EDX[13]  
EDX[14]  
EDX[15]  
0
0
0
1
Reserved  
-
-
-
-
Page Global Enable  
Reserved  
Integer Conditional Move  
Instruction  
EDX[16]  
0
FPU Conditional Move  
Instruction  
-
EDX[22:17]  
EDX[23]  
0
1
1
Reserved  
MMX  
-
-
-
EDX[24]  
6x86MX Multimedia  
Extensions  
Note: 0 = Not supported  
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210  
Revision 3.1