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INTEL387TMDX 데이터시트 PDF




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기능 Intel387TM DX MATH COPROCESSOR
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INTEL387TMDX 데이터시트, 핀배열, 회로
Intel387TM DX
MATH COPROCESSOR
Y High Performance 80-Bit Internal
Architecture
Y Implements ANSI IEEE Standard 754-
1985 for Binary Floating-Point
Arithmetic
Y Expands Intel386TM DX CPU Data
Types to Include 32- 64- 80-Bit
Floating Point 32- 64-Bit Integers and
18-Digit BCD Operands
Y Directly Extends Intel386TM DX CPU
Instruction Set to Include
Trigonometric Logarithmic
Exponential and Arithmetic Instructions
for All Data Types
Y Upward Object-Code Compatible from
8087 and 80287
Y Full-Range Transcendental Operations
for SINE COSINE TANGENT
ARCTANGENT and LOGARITHM
Y Built-In Exception Handling
Y Operates Independently of Real
Protected and Virtual-8086 Modes of
the Intel386TM DX Microprocessor
Y Eight 80-Bit Numeric Registers Usable
as Individually Addressable General
Registers or as a Register Stack
Y Available in 68-Pin PGA Package
Y One Version Supports 16 MHz – 33 MHz
Speeds
(See Packaging Spec Order 231369)
The Intel387TM DX Math CoProcessor (MCP) is an extension of the Intel386TM microprocessor architecture
The combination of the Intel387 DX MCP with the Intel386TM DX Microprocessor dramatically increases the
processing speed of computer application software which utilize mathematical operations This makes an ideal
computer workstation platform for applications such as financial modeling and spreadsheets CAD CAM or
graphics
The Intel387 DX Math CoProcessor adds over seventy mnemonics to the Intel386 DX Microprocessor instruc-
tion set Specific Intel387 DX MCP math operations include logarithmic arithmetic exponential and trigono-
metric functions The Intel387 DX MCP supports integer extended integer floating point and BCD data
formats and fully conforms to the ANSI IEEE floating point standard
The Intel387 DX Math CoProcessor is object code compatible with the Intel387 SX MCP and upward object
code compatible from the 80287 and 8087 math coprocessors Object code for Intel386 DX Intel387 DX is
also compatible with the Intel486TM microprocessor The Intel387 DX MCP is manufactured on 1 micron
CHMOS IV technology and packaged in a 68-pin PGA package
Figure 0 1 Intel387TM DX Math CoProcessor Block Diagram
240448 – 1
Other brands and names are the property of their respective owners
Information in this document is provided in connection with Intel products Intel assumes no liability whatsoever including infringement of any patent or
copyright for sale and use of Intel products except as provided in Intel’s Terms and Conditions of Sale for such products Intel retains the right to make
changes to these specifications at any time without notice Microcomputer Products may have minor variations to this specification known as errata
March 1992
Order Number 240448-005
COPYRIGHT INTEL CORPORATION 1995
1




INTEL387TMDX pdf, 반도체, 판매, 대치품
CONTENTS
PAGE
FIGURES (Continued)
Figure 3 2 Asynchronous Operation
Figure 3 3 Intel386TM DX Microprocessor and Intel387TM DX MCP Coprocessor System
Configuration
Figure 3 4 Bus State Diagram
Figure 3 5 Nonpipelined Read and Write Cycles
Figure 3 6 Fastest Transitions to and from Pipelined Cycles
Figure 3 7 Pipelined Cycles with Wait States
Figure 3 8 STEN BUSY and PEREQ Timing Relationship
Figure 4 0a Typical Output Valid Delay vs Load Capacitance at Max Operating
Temperature
Figure 4 0b Typical Output Rise Time vs Load Capacitance at Max Operating
Temperature
Figure 4 1 CPUCLK2 NUMCLK2 Waveform and Measurement Points for Input Output A C
Specifications
Figure 4 2 Output Signals
Figure 4 3 Input and I O Signals
Figure 4 4 RESET Signal
Figure 4 5 Float from STEN
Figure 4 6 Other Parameters
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TABLES
Table 2 1 Intel387TM DX MCP Data Type Representation in Memory
Table 2 2 Condition Code Interpretation
Table 2 3 Condition Code Interpretation after FPREM and FPREM1 Instructions
Table 2 4 Condition Code Resulting from Comparison
Table 2 5 Condition Code Defining Operand Class
Table 2 6 Intel386TM DX Microprocessor Interrupt Vectors Reserved for MCP
Table 2 7 Exceptions
Table 3 1 Intel387TM DX MCP Pin Summary
Table 3 2 Intel387TM DX MCP Pin Cross-Reference
Table 3 3 Output Pin Status after Reset
Table 3 4 Bus Cycles Definition
Table 4 1 DC Specifications
Table 4 2a Combinations of Bus Interface and Execution Speeds
Table 4 2b Timing Requirements of the Execution Unit
Table 4 2c Timing Requirements of the Bus Interface Unit
Table 4 3 Other Parameters
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INTEL387TMDX 전자부품, 판매, 대치품
Intel387TM DX MATH COPROCESSOR
Table 2 1 Intel387TM DX MCP Data Type Representation in Memory
NOTES
(1) S e Sign bit (0 e positive 1 e negative)
(2) dn e Decimal digit (two per byte)
(3) X e Bits have no significance Intel387TM DX MCP ignores when loading zeros when storing
(4)U e Position of implicit binary point
(5) I e Integer bit of significand stored in temporary real implicit in single and double precision
(6) Exponent Bias (normalized values)
Single 127 (7FH)
Double 1023 (3FFH)
Extended Real 16383 (3FFFH)
(7) Packed BCD (b1)S (D17 D0)
(8) Real (b1)S (2E-BIAS) (F0 F1 )
240448 – 2
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INTEL387TMDX

Intel387TM DX MATH COPROCESSOR

Intel Corporation
Intel Corporation

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