參數(shù)資料
型號： INTEL740
英文描述： 64-Bit Graphics (GUI) Accelerator
中文描述： 64位圖形（GUI）的加速器
文件頁數(shù)： 5/41頁
文件大?。?/td> 435K
代理商： INTEL740
Intel387
TM
DX MATH COPROCESSOR
Intel386
TM
DX Microprocessor Registers
GENERAL REGISTERS
31
15
0
EAX
AX
AH
AL
EBX
BX
BH
BL
ECX
CX
CH
CL
EDX
DX
DH
DL
ESI
SI
EDI
DI
EBP
BP
ESP
SP
SEGMENT REGISTERS
15
0
CS
SS
DS
ES
FS
GS
31
0
EIP
EFLAGS
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
Intel387
TM
DX MCP Data Registers
Tag
Field
1
79
78
64
63
0
0
R0
Sign
Exponent
Significand
R1
R2
R3
R4
R5
R6
R7
15
0
47
0
Control Register
Instruction Pointer (in i386
TM
DX CPU)
Status Register
Data Pointer (in i386
TM
DX CPU)
Tag Word
Figure 1.1. Intel386
TM
DX Microprocessor and Intel387
TM
DX Math Coprocessor Register Set
1.0 FUNCTIONAL DESCRIPTION
The Intel387
TM
DX Math Coprocessor provides
arithmetic instructions for a variety of numeric data
types in Intel386
TM
DX Microprocessor systems. It
also executes numerous built-in transcendental
functions (e.g. tangent, sine, cosine, and log func-
tions). The Intel387 DX MCP effectively extends the
register and instruction set of a Intel386 DX Micro-
processor system for existing data types and adds
several new data types as well. Figure 1.1 shows the
model of registers visible to programs. Essentially,
the Intel387 DX MCP can be treated as an additional
resource or an extension to the Intel386 DX Micro-
processor. The Intel386 DX Microprocessor togeth-
er with a Intel387 DX MCP can be used as a single
unified system.
The Intel387 DX MCP works the same whether the
Intel386 DX Microprocessor is executing in real-ad-
dress mode, protected mode, or virtual-8086 mode.
All memory access is handled by the Intel386 DX
Microprocessor; the Intel387 DX MCP merely oper-
ates on instructions and values passed to it by the
Intel386 DX Microprocessor. Therefore, the Intel387
DX MCP is not sensitive to the processing mode of
the Intel386 DX Microprocessor.
In real-address mode and virtual-8086 mode, the In-
tel386 DX Microprocessor and Intel387 DX MCP are
completely upward compatible with software for
8086/8087, 80286/80287 real-address mode, and
Intel386 DX Microprocessor and 80287 Coproces-
sor real-address mode systems.
In protected mode, the Intel386 DX Microprocessor
and Intel387 DX MCP are completely upward com-
patible with software for 80286/80287 protected
mode, and Intel386 DX Microprocessor and 80287
Coprocessor protected mode systems.
The only differences of operation that may appear
when 8086/8087 programs are ported to a protect-
ed-mode Intel386 DX Microprocessor and Intel387
DX MCP system (not using virtual-8086 mode), is in
the format of operands for the administrative instruc-
tions FLDENV, FSTENV, FRSTOR and FSAVE.
These instructions are normally used only by excep-
tion handlers and operating systems, not by applica-
tions programs.
The Intel387 DX MCP contains three functional units
that can operate in parallel to increase system per-
formance. The Intel386 DX Microprocessor can be
transferring commands and data to the MCP bus
control logic for the next instruction while the MCP
floating-point unit is performing the current numeric
instruction.
5
5
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