參數(shù)資料
型號(hào)： 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(yè)數(shù)： 13/24頁(yè)
文件大?。?/td> 399K
代理商： M80287
M80287
Table 2. M80287 Datatype Representation in Memory
271029–5
NOTES:
1. S
e
Sign bit (0
e
positive, 1
e
negative)
2. d
n
e
Decimal digit (two per byte)
3. X
e
Bits have no significance; M8087 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 short and long real.
6. Exponent Bias (normalized values):
Short Real: 127 (7FH)
Long Real: 1023 (3FFH)
Temporary Real: 16383 (3FFFH)
7. Packed BCD: (
1)
S
(D
17
. . . D
0
)
8. Real: (
b
1)
S
(2
E-BIAS
) (F
0
F
1
. . . )
SOFTWARE INTERFACE
The M80286/20 is programmed as a single proces-
sor. All communication between the M80286 and
the M80287 is transparent to software. The CPU au-
tomatically controls the M80287 whenever a numer-
ic instruction is executed. All memory addressing
modes, physical memory, and virtual memory of the
CPU are available for use by the NPX.
Since the NPX operates in parallel with the CPU, any
errors detected by the NPX may be reported after
the CPU has executed the ESCAPE instruction
which caused it. To allow identification of the failing
numeric instruction, the NPX contains two pointer
registers which identify the address of the failing nu-
meric instruction and the numeric memory operand if
appropriate for the instruction encountering this er-
ror.
13
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