80960KB datasheet(10/44 Pages) INTEL

10 / 44 page

80960KB

Figure 3. Instruction Formats

OpcodeDisplacement

OpcodeReg/LitRegMDisplacement

OpcodeRegReg/LitModesExt’d OpReg/Lit

OpcodeRegBaseMXOffset

OpcodeRegBaseModeScalexxOffset

Displacement

Control

Compare and

Branch

Memory

Access—Short

Memory

Access—Long

1.1.1

Memory Space And Addressing Modes

The

80960KB

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 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.

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

80-bit registers (FP0 through FP3). These registers

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

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