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Motorola DSP96002 User Manual

Page 780

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D-28

DSP96002 USER’S MANUAL

MOTOROLA

Figure D-16. Exponent Comparator/Update Unit.

Exponent Comparitor/Update Unit

11 Bits

11 Bits

11 Bits

11 Bits

ES1

ES2

max(E1, E2)

E1-E2

To Mantissa
Alignment

To Post-
Normalization

D.2

FIXED-POINT NUMBER STORAGE AND ARITHMETIC

D.2.1 General

Integer operand sizes are defined as follows:

1.

Byte: 8 bits long

2.

Short word: 16 bits long

3.

Word: 32-bits long

4.

Long word: 64 bits long

The operand size for each instruction is either explicitly encoded in the instruction or implicitly defined by

the instruction.

D.2.2 Integer Storage Format in Memory

The DSP96002 supports four integer memory data formats:

1.

Signed word integer: 32-bits wide, two’s complement representation. This storage format can

be used in either X and/or Y data memory space.

2.

Signed Long Word Integer: 64 bits wide, two’s complement representation. This storage format

can only be used in long (L) data memory space.

3.

Unsigned Word Integer: 32-bits wide with unsigned magnitude representation. This storage for-

mat can be used in either X and/or Y data memory space.