What is the difference between closely coupled configuration and loosely coupled configuration in microprocessor?

Answer 1

Loosely coupled microprocessors are more like independent processors joined via a small communication link (a high speed bus or cable). This means that the connected microprocessors have their own local memory sets. They are low in performance. Also only microprocessors that can work independently may be used.

Tightly coupled microprocessors share a common memory for the purpose of communication. One processor (slave) is dependent on the other (master). They are good at performance. The connected processors also have local memory sets for general purposes.

Answer 2

DIFFERENCE BETWEEN TIGHTLY COUPLED ANDLOOSELY COUPLED MULTIPROCESSOR

TIGHTLY COUPLED LOOSELY COUPLED

(1)

Tightly-coupled

multiprocessor systems

contain multiple CPUs that are connected atthe bus level. These CPUs may have access toa central shared memory (SMP orUMA), ormay participate in a memory hierarchy withboth local and shared memory (NUMA).

(1)

L

oosely-coupled

multiprocessor system(often referred to as clusters) are baesd onmultiple standalone single or dual processorcommodity computers interconnected via ahigh speed communication system .

(2)

Tightly-coupled systems perform better & arephysically smaller than loosely-coupled system.

(2)

Loosely coupled system is justOpposite of tightly coupled system.

(3) More expensive.

(3)

Less expensive.

(4) In a tightly-coupled system, the delayExperienced , when a message is sentfrom onecomputerto another is short,and data rate is high; that is, the numberof bits per second that can be transferredis large.

(4)

In a loosely-coupled system, the opposite istrue: The inter-machine message delay islarge and thedata rateis low.

(5) For example, two CPU chips on the sameprinted circuit board and connected by wiresetched onto the board are likely to be tightlyCoupled.

(5)

For example

,

two computers connected by a2400 bit/sec modem over the telephonesystem are certain to be loosely coupled.

(6) Tightly-coupled systems tend to be much moreenergy efficient than clusters. This is becauseconsiderable economies can be realized bydesigning components to work together fromthe beginning in tightly-coupled systems.

(6)

loosely-coupled systems use components thatwere not necessarily intended specifically for use in such systems.

MADE BY: ANKIT DIWAN (7

TH

SEM, C.S., R.I.T.)

Answer 3

Loosely coupled microprocessors are more like independent processors joined via a small communication link (a high speed bus or cable). This means that the connected microprocessors have their own local memory sets. They are low in performance. Also only microprocessors that can work independently may be used.

Tightly coupled microprocessors share a common memory for the purpose of communication. One processor (slave) is dependent on the other (master). They are good at performance. The connected processors also have local memory sets for general purposes.

Answer 4

Closely coupled configuration keeps the microprocessor coupled together at a close proximity. However, a loosely coupled configuration of the microprocessor does not maintain the closely coupled proximity.