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| 型號(hào)： | intel386 SX |
| 廠商： | Intel Corp. |
| 英文描述： | 32-Bit CPU With a 16-Bit External Data Bus And a 24-bit External Address Bus(帶16位內(nèi)部數(shù)據(jù)總線和24位內(nèi)部地址總線32位微處理器) |
| 中文描述： | 32位16位外部數(shù)據(jù)總線和24位外部地址總線CPU（帶16位內(nèi)部數(shù)據(jù)總線和24位內(nèi)部地址總線32位微處理器） |
| 文件頁(yè)數(shù)： | 22/102頁(yè) |
| 文件大?。?/td> | 1166K |
| 代理商： | INTEL386 SX |
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Intel386
TM
SX MICROPROCESSOR
240187–8
Figure 2.7. Debug Registers
3.0 REAL MODE ARCHITECTURE
When the processor is reset or powered up it is ini-
tialized in Real Mode. Real Mode has the same base
architecture as the 8086, but allows access to the
32-bit register set of the Intel386 SX Microproces-
sor. The addressing mechanism, memory size, and
interrupt handling are all identical to the Real Mode
on the 80286.
The default operand size in Real Mode is 16 bits, as
in the 8086. In order to use the 32-bit registers and
addressing modes, override prefixes must be used.
In addition, the segment size on the Intel386 SX Mi-
croprocessor in Real Mode is 64K bytes so 32-bit
addresses must have a value less then 0000FFFFH.
The primary purpose of Real Mode is to set up the
processor for Protected Mode operation.
3.1 Memory Addressing
In Real Mode the linear addresses are the same as
physical addresses (paging is not allowed). Physical
addresses are formed in Real Mode by adding the
contents of the appropriate segment register which
is shifted left by four bits to an effective address.
This addition results in a 20-bit physical address or a
1 megabyte address space. Since segment registers
are shifted left by 4 bits, Real Mode segments al-
ways start on 16-byte boundaries.
All segments in Real Mode are exactly 64K bytes
long, and may be read, written, or executed. The
Intel386 SX Microprocessor will generate an excep-
tion 13 if a data operand or instruction fetch occurs
past the end of a segment.
22
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| INTEL386 | Intel386 EX Embedded Microprocessor |
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| INTEL486 GX | Emedded Ultra-Low Power INTEL486 GX Processor(嵌入式超低能量處理器) |
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相關(guān)代理商/技術(shù)參數(shù) |
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| INTEL387 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel387TM SX MATH COPROCESSOR |
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