80960KB datasheet(5/39 Pages) INTEL

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80960KB

Figure 3. Instruction Formats

Opcode

Displacement

Opcode

Reg/Lit

Reg

Displacement

Opcode

Reg

Reg/Lit

Modes

Ext’d Op

Reg/Lit

Opcode

Reg

Base

Offset

Opcode

Reg

Base

Mode

Scale

Offset

Displacement

Control

Compare and

Branch

Memory Access—

Short

Memory Access—

Long

1.1.1.

Memory Space And Addressing Modes

The 80960KB offers a linear programming environ-

ment so that all programs running on the processor

are contained in a single address space. Maximum

address space size is 4 Gigabytes (2

32 bytes).

For ease of use the 80960KB has a small number of

addressing modes, but includes all those necessary

to ensure efficient execution of high-level languages

such as C. Table 2 lists the modes.

Table 2. Memory Addressing Modes

• 12-Bit Offset

• 32-Bit Offset

• Register-Indirect

• Register + 12-Bit Offset

• Register + 32-Bit Offset

• Register + (Index-Register x Scale-Factor)

• Register x Scale Factor + 32-Bit Displacement

• Register + (Index-Register x Scale-Factor) +

32-Bit Displacement

• Scale-Factor is 1, 2, 4, 8 or 16

1.1.2.

Data Types

The 80960KB recognizes the following data types:

Numeric:

• 8-, 16-, 32- and 64-bit ordinals

• 8-, 16-, 32- and 64-bit integers

• 32-, 64- and 80-bit real numbers

Non-Numeric:

• Bit

• Bit Field

• Triple Word (96 bits)

• Quad-Word (128 bits)

1.1.3.

Large Register Set

The 80960KB programming environment includes a

large number of registers. In fact, 32 registers are

available at any time. The availability of this many

registers greatly reduces the number of memory

accesses required to perform algorithms, which leads

to greater instruction processing speed.

There are two types of general-purpose registers:

local and global. The 20 global registers consist of

sixteen 32-bit registers (G0 though G15) and four

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