參數(shù)資料
型號(hào)： intel386 DX
廠商： Intel Corp.
英文描述： 32-Bit CHMOS Microprocessor With Integrated Memory Management(32位CHMOS 微處理器帶集成存儲(chǔ)管理)
中文描述： 32位CHMOS微處理器集成內(nèi)存管理（32位CHMOS微處理器帶集成存儲(chǔ)管理）
文件頁(yè)數(shù)： 33/139頁(yè)
文件大?。?/td> 1587K
代理商： INTEL386 DX
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Intel386
TM
DX MICROPROCESSOR
231630–54
Figure 3-1. Real Address Mode Addressing
All of the Intel386 DX instructions are available in
Real Mode (except those instructions listed in 4.6.4).
The default operand size in Real Mode is 16-bits,
just like 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
DX in Real Mode is 64K bytes so 32-bit effective
addresses must have a value less the 0000FFFFH.
The primary purpose of Real Mode is to set up the
processor for Protected Mode Operation.
The LOCK prefix on the Intel386 DX, even in Real
Mode, is more restrictive than on the 80286. This is
due to the addition of paging on the Intel386 DX in
Protected Mode and Virtual 8086 Mode. Paging
makes it impossible to guarantee that repeated
string instructions can be LOCKed. The Intel386 DX
can’t require that all pages holding the string be
physically present in memory. Hence, a Page Fault
(exception 14) might have to be taken during the
repeated string instruction. Therefore the LOCK pre-
fix can’t be supported during repeated string instruc-
tions.
These are the only instruction forms where the
LOCK prefix is legal on the Intel386 DX:
Opcode
Operands
(Dest, Source)
BIT Test and
SET/RESET/COMPLEMENT
XCHG
XCHG
ADD, OR, ADC, SBB,
AND, SUB, XOR
NOT, NEG, INC, DEC
Mem, Reg/immed
Reg, Mem
Mem, Reg
Mem, Reg/immed
Mem
An exception 6 will be generated if a LOCK prefix is
placed before any instruction form or opcode not
listed above. The LOCK prefix allows indivisible
read/modify/write operations on memory operands
using the instructions above. For example, even the
ADD Reg, Mem is not LOCKable, because the Mem
operand is not the destination (and therefore no
memory read/modify/operation is being performed).
Since, on the Intel386 DX, repeated string instruc-
tions are not LOCKable, it is not possible to LOCK
the bus for a long period of time. Therefore, the
LOCK prefix is not IOPL-sensitive on the Intel386
DX. The LOCK prefix can be used at any privilege
level, but only on the instruction forms listed above.
3.2 MEMORY ADDRESSING
In Real Mode the maximum memory size is limited to
1 megabyte. Thus, only address lines A2–A19 are
active. (Exception, the high address lines A20–A31
are high during CS-relative memory cycles until an
intersegment jump or call is executed (see section
2.10)).
Since paging is not allowed in Real Mode the linear
addresses are the same as physical addresses.
Physical addresses are formed in Real Mode by
adding the contents of the appropriate segment reg-
ister which is shifted left by four bits to an effective
address. This addition results in a physical address
from 00000000H to 0010FFEFH. This is compatible
with 80286 Real Mode. Since segment registers are
shifted left by 4 bits this implies that Real Mode seg-
ments always start on 16 byte boundaries.
All segments in Real Mode are exactly 64K bytes
long, and may be read, written, or executed. The
Intel386 DX will generate an exception 13 if a data
operand or instruction fetch occurs past the end of a
segment. (i.e. if an operand has an offset greater
than FFFFH, for example a word with a low byte at
FFFFH and the high byte at 0000H.)
33
相關(guān)PDF資料
PDF描述
Intel386 EX Highly Integrated, 32-Bit, Fully Static Embedded Micropocessor(32位高集成完全靜態(tài)嵌入式微處理器)
INTEL386 SXSA 5-V 32-Bit Fully Static Embedded Microprocessor(5V，32位完全靜態(tài)嵌入式微處理器)
intel386 SX 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(xiàn)和24位內(nèi)部地址總線(xiàn)32位微處理器)
INTEL386 Intel386 EX Embedded Microprocessor
Intel387 dx DX Math Coprocessor(32位數(shù)學(xué)協(xié)處理器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
INTEL386SX 制造商:INTEL 制造商全稱(chēng):Intel Corporation 功能描述:MICROPROCESSOR
INTEL387 制造商:INTEL 制造商全稱(chēng):Intel Corporation 功能描述:Intel387TM SX MATH COPROCESSOR
INTEL387DX 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Intel387 DX - MATH COPROCESSOR
INTEL387SX 制造商:INTEL 制造商全稱(chēng):Intel Corporation 功能描述:Intel387 SX - MATH COPROCESSOR
INTEL387TMDX 制造商:INTEL 制造商全稱(chēng):Intel Corporation 功能描述:Intel387TM DX MATH COPROCESSOR
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