TS68882MF1B/C25 E2V, TS68882MF1B/C25 Datasheet - Page 24

• Manufacturer Part Number: TS68882MF1B/C25
• Manufacturer: E2V

Specifications of TS68882MF1B/C25

• Operating Temperature (max): 125C
• Operating Temperature Classification: Military
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

8.4
8.5
8.6
24
Operand Data Formats
Integer Data Formats
Floating-point Data Formats
0852B–HIREL–06/07
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 TS68882 in that defaults are re-established.
Note:
The TS68882 supports the following data formats:
The capital letters contained in parenthesis denote suffixes added to instructions in the assembly lan-
guage source to specify the data format to be used.
The three Integer data formats (byte, word, and long word) are the standard data formats supported in
the TS68000 Family architecture. Whenever an integer is used in a floating-point operation, the integer
is automatically converted by the TS68882 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 reg-
ister 3 (FP3), the following instruction can be used:
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.
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.
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.
Table 8-1.
• 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)
FADD.W #5.FP3
Data Format
Though the TS68882 is instruction set compatible with the TS68881, the idle and busy state frames are
both 32 bytes larger on the TS68882 than on the TS68881. A unique format word is generated by the
TS68882 so that system software can detect this difference.
Extended
Double
Single
Exponent and Mantissa Sizes
Table 8-1
Exponent Bits
lists the exponent and mantissa size for single, double, and extended
11
15
8
Mantissa Bits
23 (+1)
52 (+1)
64
e2v semiconductors SAS 2007
16383
1023
Bias
TS68882
127