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EXTENDED PRECISION
A 96-bit binary floating-point operand format composed of four fields: a one-bit sign
field, an 15-bit biased exponent field, a 16-bit undefined field, and a 64-bit mantissa
(significand) field.
F FIELD
See fraction (F field).
FIXED-POINT
Pertaining to a numeration system in which the position of the radix point is fixed
with respect to one end of the numerals, according to some convention. The integer
data types used by the FPCP are fixed-point numbers.
FLOATING-POINT
Pertaining to a system in which the location of the radix point does not remain fixed
with respect to one end of the numerical expressions, but is regularly recalculated.
The location of the point is usually given by expressing a power of the base (or radix).
The single, double, and extended precision data types used by the FPCP are floating-
point numbers.
FRACTION (F FIELD)
The field of the significand that lies to the right of its implied binary point.
INTEGER
Any of the natural numbers, the negatives of these numbers, or zero.
MANTISSA
Mantissa and significand are interchangeable throughout this manual. See significand.
MODULO
A mathematical operation that yields the remainder of division. Thus, 39 modulo 6 =3.
MONADIC OPERATION
An operation on one operand, for example, negation.
NAN (Not-A-Number)
A symbolic entity encoded in floating-point format. There are two types of NANs;
signaling and quiet. Signaling NANs signal the valid operation exception whenever
appearing as operands. Quiet NANs propagate through almost every arithmetic op-
eration without signaling exceptions.
NORMALIZE
To convert a floating-point number to one whose significand consists of an integer
bit of 1.
OPERAND
That which is, or is to be operated upon. An operand is usually identified by an address
field of an instruction.
ORTHOGONAL
Statistically independent.
FREESCALE
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MC68881/MC68882 USER'S MANUAL
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