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30036-23 参数 Datasheet PDF下载

30036-23图片预览
型号: 30036-23
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内容描述: 的Geode ™ GXLV处理器系列的低功耗X86集成解决方案 [Geode⑩ GXLV Processor Series Low Power Integrated x86 Solutions]
分类和应用:
文件页数/大小: 247 页 / 4117 K
品牌: NSC [ National Semiconductor ]
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Processor Programming (Continued)  
3.6.5 Exceptions in Real Mode  
3.6.6 Error Codes  
Many of the exceptions described in Table 3-29 "Interrupt  
Vector Assignments" on page 80 are not applicable in real  
mode. Exceptions 10, 11, and 14 do not occur in real  
mode. Other exceptions have slightly different meanings  
in real mode as listed in Table 3-31.  
When operating in protected mode, the following exceptions  
generate a 16-bit error code:  
Double Fault  
Alignment Check  
Invalid TSS  
Segment Not Present  
Stack Fault  
General Protection Fault  
Page Fault  
Table 3-31. Exception Changes in Real Mode  
Vector  
Number  
Protected Mode  
Function  
Real Mode  
Function  
The error code format and bit definitions are shown in  
Table 3-32. Bits [15:3] (selector index) are not meaningful  
if the error code was generated as the result of a page  
fault. The error code is always zero for double faults and  
alignment check exceptions.  
8
Double fault.  
Invalid TSS.  
Interrupt table limit overrun.  
Does not occur.  
10  
11  
Segment not  
present.  
Does not occur.  
12  
13  
Stack fault.  
SS segment limit overrun.  
General protection CS, DS, ES, FS, GS seg-  
fault.  
ment limit overrun. In pro-  
tected mode, an error code is  
pushed. In real mode, no  
error code is pushed.  
14  
Page fault.  
Does not occur.  
Table 3-32. Error Codes  
15  
14  
13  
12  
11  
10  
9
8
7
6
5
4
3
2
1
0
Selector Index  
S2  
S1  
S0  
Table 3-33. Error Code Bit Definitions  
Fault  
Type  
Selector Index  
(Bits 15:3)  
S2 (Bit 2)  
S1 (Bit 1)  
S0 (Bit 0)  
Page  
Fault  
Reserved.  
Fault caused by:  
Fault occurred during:  
Fault occurred during  
0 = Not present page  
1 = Page-level protection  
violation  
0 = Read access  
1 = Write access  
0 = Supervisor access  
1 = User access.  
IDT Fault Index of faulty IDT Reserved  
selector.  
1
0
If = 1, exception occurred while  
trying to invoke exception or  
hardware interrupt handler.  
Segment Index of faulty  
Fault selector.  
TI bit of faulty selector  
If =1, exception occurred while  
trying to invoke exception or  
hardware interrupt handler.  
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