Sharp PC-4741 Service Manual page 54

9-3.8087
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P C-4741
------------------~NUM~~~~CgPRgC&SSOR----
________________ _
8087-1
• High Performance Numeric Data Coprocessor
• Adds Arithmetic, Trigonometric, Exponential,
and Logarithmic Instructions to the Standard
8086/8088 and 80186/80188 Instruction Set for
All Data Types
• Adds 8 x 80-Blt Individually Addressable
Register Stack to the 8086/8088 and 80186/80188
Architecture
• 7 Built-In Exception Handling Functions
• MUL TIBUS® System Compatible Interface
• CPu/8087 Supports 7 Data Types: 16-, 32-, 64-Blt
Integers, 32-, 64-, 80-Bit Floating Point, and
18-Dlglt BCD Operands
• Compatible with IEEE Floating Point Standard
754
The 8087 Numeric Data Coprocessor provides the instructions and data types needed for high performance numeric applications,
providing up to 100 times the performance of a CPU alone. The 8087 is implemented in N-channel, depletion load, silicon gate
technology (HMOS III), housed in a 40-pin package. Sixty-eight numeric processing instructions are added to the 8086/8088,
80186/80188 instruction sets and eight 80-bit registers are added to the register set. The 8087 is compatible with the
IEEE
Floating
Point Standard 754.
ONTAOLWORD
STATUS WORD
EXPONENT
BUS
,-:---,-.
FRACTION,,,-_ _ , , ,
I
BUS , - - " ' - - _ ,
I
INTERFACE
16
68
..... ,..-.1
DATA
DATA... BUFFER
I
I
I
I
I
I
I
I
OPERANDS
QUEUE
64
16
I I
I
T
~~§(7)
I
I
~
l= : : :
I
I
w
REGISTER STACK (4)
I
ADD~ESSING
&
I
f-------1
(3)
I
BUS TRACKING
~
f-------1
12 )
EXCEPTION
I
0
;~;
I
L--"~T~S
___
~
_____
---1"
80BITS----?>-j _ _ _ _ _ _
I
STATUS
ADDRESS
GND 1
(A13)AD13 3
(A12)AD12 4
(AtO)ADtO 6
(A9)AD9 7
ADS 10
8087 NPX
AD5 11 31 NC
AD4 12 NC
ADS 13
A02 14
AD1 15
ADO 16
NC 18
eLK 19
Figure 1. 8087 Block Diagram
Figure 2. 8087 Pin Configuration
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