80960SB datasheet(8/38 Pages) INTEL

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80960SB

Figure 3. Instruction Formats

Control

Compare and

Branch

Memory Access---

Short

Memory Access---

Long

Opcode

Displacement

Opcode

Displacement

Reg/Lit

Reg

Displacement

Opcode

Reg

Reg/Lit

Base

Modes

Mode

Ext’d Op

Reg/Lit

Offset

Scale

Offset

1.1.1

Memory Space And Addressing Modes

The

80960SB

offers

linear

programming

environment so that all programs running on the

processor are contained in a single address space.

Maximum address space size is 4 Gigabytes (232

bytes).

For ease of use the 80960SB 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 memory addressing

modes.

Table 2. Memory Addressing Modes

•

12-Bit Offset

•

32-Bit Offset

•

32-Bit Displacement

Scale-Factor is 1, 2, 4, 8 or 16

1.1.2

Data Types

The 80960SB 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 80960SB 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 register:

local and global. The global registers consist of

sixteen 32-bit registers (g0 though g15) and four

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