參數(shù)資料
型號(hào)： TS8882VF20
文件頁(yè)數(shù)： 23/42頁(yè)
文件大?。?/td> 1703K
代理商： TS8882VF20
23
TS68882
2119A
–
12/01
Thus the size of the saved internal state is kept to a minimum. The ability to utilize several
internal state sizes greatly reduces the average context switching time.
The FRESTORE instruction permits reloading of an internal state that was saved earlier, and
continue any operation that was previously suspended. Restoring of the reset internal state
functions just like a hardware reset to the TS 68882 in that defaults are re-established.
Note:
Though the TS 68882 is instruction set compatible with the TS 68881, the idle and busy state
frames are both 32 bytes larger on the TS 68882 than on the TS 68881. A unique format word is
generated by the TS 68882 so that system software can detect this difference.
Operand Data
Formats
The TS 68882 supports the following data formats:
Byte Integer (B)
Word Integer (W)
Long Word Integer (L)
Single Precision Real (S)
Double Precision Real (D)
Extended Precision Real (X)
Packed Decimal String Real (P)
The capital letters contained in parenthesis denote suffixes added to instructions in the
assembly language source to specify the data format to be used.
Integer Data
Formats
The three Integer data formats (byte, word, and long word) are the standard data formats sup-
ported in the TS 68000 Family architecture. Whenever an integer is used in a floating-point
operation, the integer is automatically converted by the TS 68882 to an extended precision
floating-point number before being used. For example, to add an integer constant of five to the
number contained in floating-point data register 3 (FP3), the following instruction can be used:
FADD.W #5.FP3
The ability to effectively use integers in floating-point operations saves user memory since an
integer representation of a number, if representable, is usually smaller than the equivalent
floating-point representation.
Floating-point
Data Formats
The floating-point data formats single precision (32-bits) and double precision (64-bits) are as
defined by the IEEE standard. These are the main floating-point formats and should be used
for most calculations involving real numbers. Table 8 lists the exponent and mantissa size for
single, double, and extended precision. The exponent is biased, and the mantissa is in sign
and magnitude form. Since single and double precision require normalized numbers, the most
significant bit of the mantissa is implied as one and is not included, thus giving one extra bit of
precision.
The extended precision data format is also in conformance with the IEEE standard, but the
standard does not specify this format to the bit level as it does for single and double precision.
Table 8.
Exponent and Mantissa Sizes
Data Format
Exponent
Bits
Mantissa
Bits
Bias
Single
8
23 (+1)
127
Double
11
52 (+1)
1023
Extended
15
64
16383
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