80960MC datasheet(8/39 Pages) INTEL

8 / 39 page

80960MC

PRELIMINARY

Figure 2. Instruction Formats

Opcode

Displacement

Opcode

Reg/Lit

Reg

Displacement

Control

Compare and

Branch

Memory Access-

Short

Memory Access-

Long

Opcode

Reg

Reg/Lit

Modes

Ext’d Op

Reg/Lit

Opcode

Reg

Base

Offset

Opcode

Reg

Base

Mode

Scale

Offset

1.1.1

Memory Space And Addressing Modes

The 80960MC allows each task (process) to address

a logical memory space of up to 4 Gbytes. Each

task’s address space is divided into four 1 Gbyte

regions and each region can be mapped to physical

addresses by zero, one, or two levels of page tables.

The region with the highest addresses (Region 3) is

common to all tasks.

In keeping with RISC design principles, the number

of addressing modes is minimal yet includes all

those necessary to ensure efficient execution of

high-level languages such as Ada, C, and Fortran.

Table 2 lists the memory accessing modes.

1.1.2

Data Types

The 80960MC 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 80960MC programming environment includes a

large number of registers. 36 registers are available

at any time; this greatly reduces the number of

memory accesses required to perform algorithms,

which leads to greater instruction processing speed.

Two types of general-purpose registers are avail-

able: 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

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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