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參數(shù)資料
| 型號： | M80287 |
| 廠商： | Intel Corp. |
| 英文描述： | 80-BIT HMOS* NUMERIC PROCESSOR EXTENSION |
| 中文描述： | 80位的保健組織*數(shù)值處理器擴(kuò)展 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大小： | 399K |
| 代理商： | M80287 |
M80287
FUNCTIONAL DESCRIPTION
The M80287 Numeric Processor Extension (NPX)
provides arithmetic instructions for a variety of nu-
meric data types in M80286/20 systems. It also exe-
cutes numerous built-in transcendental functions
(e.g., tangent and log functions). The M80287 exe-
cutes instructions in parallel with an M80286. It ef-
fectively extends the register and instruction set of
an M80286/10 system for existing M80286 data
types and adds several new data types as well. Fig-
ure 3 presents the program visible register model of
the M80286/20. Essentially, the M80287 can be
treated as an additional resource or an extension to
the M80286/10 that can be used as a single unified
system, the M80286/20.
The M80287 has two operating modes similar to the
two modes of the M80286. when reset, M80287 is in
the real address mode. It can be placed in the pro-
tected virtual address mode by executing the
SETPM ESC instruction. The M80287 cannot be
switched back to the real address mode except by
reset. In the real address mode, the M80286/20 is
completely software compatible with M8086, 88/20.
Once in protected mode, all references to memory
for numerics data or status information, obey the
M80286 memory management and protection rules
giving a fully protected extension of the M80286
CPU. In the protected mode, M80286/20 numerics
software
is
also
completely
M8086/20 and M8088/20.
compatible
with
The M80287 has two operating modes similar to the
two modes of the M80286. When reset, M80287 is
in the real address mode. It can be placed in the
protected virtual address mode by executing the
SETPM ESC instruction. The M80287 cannot be
switched back to the real address mode except by
reset.
In
the
real
M80286/M80287 is completely software compatible
with M8086/M8087 and M8088/M8087.
address
mode,
the
Once in protected mode, all references to memory
for numerics data or status information, obey the
M80286 memory management and protection rules
giving a fully protected extension of the M80286
CPU. In the protected mode, M80286/M80287 nu-
merics software is also completely compatible with
M8086/M8087 and M8088/M8087.
271029–3
Figure 3. M80286/20 Architecture
3
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