80960SB datasheet(10/38 Pages) INTEL

Part #	80960SB

Description	EMBEDDED 32-BIT MICROPROCESSOR WITH 16-BIT BURST DATA BUS

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6

80960SB

Figure 4. Multiple Register Sets Are Stored On-Chip

r15

r0

31

0

ONE OF FOUR

LOCAL

REGISTER SETS

REGISTER

CACHE

LOCAL REGISTER SET

1.1.7

Floating-Point Arithmetic

In the 80960SB, floating-point arithmetic has been

made an integral part of the architecture. Having the

floating-point unit integrated on chip provides two

advantages. First, it improves the performance of the

chip

for

floating-point

applications,

since

no

additional bus overhead is associated with floating-

point calculations, thereby leaving more time for

other bus operations such as I/O. Second, the cost of

using floating-point operations is reduced because a

separate coprocessor chip is not required.

The 80960SB floating-point (real-number) data types

include single-precision (32-bit), double-precision

(64-bit) and extended precision (80-bit) floating-point

numbers. Any registers may be used to execute

floating-point operations.

The processor provides hardware support for both

mandatory and recommended portions of IEEE

Standard 754 for floating-point arithmetic, including

all arithmetic, exponential, logarithmic and other

transcendental functions. Table 3 shows execution

times for some representative instructions.

1.1.8

High Bandwidth Bus

The 80960SB CPU resides on a high-bandwidth

address/data bus. The bus provides a direct commu-

nication path between the processor and the

memory

and

I/O

subsystem

interfaces.

The

processor uses the bus to fetch instructions,

manipulate memory and respond to interrupts. Bus

features include:

•

16-bit data path multiplexed onto the lower bits of

the 32-bit address path

•

Eight 16-bit half-word burst capability which

allows transfers from 1 to 16 bytes at a time

•

High bandwidth reads and writes with

25.6 MBytes/s burst (at 16 MHz)

Table 4 defines bus signal names and functions;

Table 5 defines other component-support signals

such as interrupt lines.

Table 3. Sample Floating-Point Execution Times

(

µs) at 16 MHz

Function

32-Bit

64-Bit

Add

0.6

0.8

Subtract

0.6

0.8

Multiply

1.1

2.0

Divide

2.0

4.5

Square Root

5.8

6.1

Arctangent

15.8

20.5

Exponent

17.7

19.5

Sine

23.8

25.9

Cosine

23.8

25.9

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80960SB Datasheet(PDF) 10 Page - Intel Corporation

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