Elenco Electronics MO-1251 Manual do Utilizador descarregar pdf (Página 78)

100

RESET

ANALYZE

ERROR

MEMORY

CONTROL

SIGNALS

ON -CHIP FLOATING -POINT

COPROCESSOR

11800 ONLY)

SYSTEM

SERVICES

TIMERS

2K BYTES

-CHIP

RAM

(4K

-T800I

EXTERNAL

MEMORY

INTERFACE

32 BIT

PROCESSOR

LINK

F.,

LINK

SPEED

SERVICES

SELECTION

LINK

Ha..

LINK

INTERFACE

LINK

INTERFACE

LINK

INTERFACE

LINK

LINK 3

INTERFACE

EVENT

MEMORY

ADDRESS /DATA

rig. i. tsw1;tc

utwatwn al

tNMUJs transputers.

cache memory;

the T800

is elec-

trically equivalent.

but with a

built -in numeric

coprocessor

and 4K of

cache memory.

Currently, three

companies are

actively involved

in making

transputers

for PC use:

Micro -

Way,

Computer System Archi-

tects (CSA). and Definicon.

Each

has a family

of transputer

boards

built around

as many as four

INMOS

transputer IC's

on a sin-

gle card. MicroWay

sells

the

Monoputer,

Biputer,

and Quad -

puter;

CSA sells

the PARallel

11-ansputer

Series (PARTS); and

Definicon

sells the T4

series. In

addition

to the transputer and

support logic,

each card contains

on -board RAM;

the amount of

memory varies

from board to

board.

Although

transputer -board

prices

often reach into the

tens of

thousands of

dollars. you can do

a lot

for under

$2000.

For exam-

ple.

the

$1995

MicroWay Mono

puter

with a single 20 -MHz T800

transputer and 2MB of RAM can

provide

the PC with the numeric

processing power of a VAX

8600 -DEC's

largest miniframe

system.

The

$1990

Definicon

T4- 1/800, with

one 20 -MHz T800

80386;

both

have

-bit

buses,

and

both can

access up

four

gigabits

of virtual

memory.

fact,

80386

CPU's have

suc-

cessfully

been used

by Intel

Sci-

entific

Computers

(a division of

Intel

Corporation) in

parallel pro-

cessing

supercomputers.

What

sets the

transputer

apart

from a

typical microprocessor

its four

high -speed

serial

com-

munication

links

-links

that can

interconnect

several transputers

in a network

array of pro-

cessors

using

simple hardware

jumpers.

In essence,

trans-

puter

serves

as a building block

for

system of arbitrary

size and

complexity.

For example.

it's pos-

sible to build

a system that

ex-

ceeds

the processing

power of

mighty

Cray 1S

supercomputer

using

only eight of

the INMOS

T800 transputers!

So what determines

the

perfor-

mance

of a parallel

processing

system?

Simply

stated, the hard-

ware

architecture

-which

largely

determined

by the ap-

Fig.

2. THE

CSA EVALUATION /STARTER

KIT contains a 20 -MHz

T414 INMOS

trans-

puter.

256K

of RAM. and

C compiler. and

selisfor less

than

$1000.

and 1MB

of RAM has

the same

processing

speed

as the Mono -

puter,

but less

RAM. If those are

beyond your

budget.

CSA's

PARTS.2

Evaluation/Starter

Kit,

shown in Fig.

2. consists

of a sin-

gle

20 -MHz T414

transputer,

256K of RAM.

and C compiler.

That kit

puts PC -based

parallel

processing

power in the hands

the experimenter

for well

under

$1000.

By itself,

the INMOS trans-

puter

is nothing special. It

is only

slightly faster

than a 16

-MHz

plication.

One

configuration

may

suitable to a

specific

problem

than

another.

For

example, if

an application

requires

much

number

crunch-

ing. you'd

want

to connect

the

transputers

a linear, pipeline

configuration.

For multiprocess-

ing tasks

such as

image recogni-

tion, you want

as much

paral-

lelism as possible.

And

for CAD

applications

with numerous

vec-

tor recalculations,

a combined

parallel/pipeline

topology

is pre-

ferred.

Let's discuss

each.

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 99 100

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