MEMORY ORGANIZATION

BY:zarif amin
d031610245

MEMORY ORGANIZATON

Computer MEMORY is a physical device capable of storing information temporarily or permanently.For example ,RANDOM ACCESS MEMORY (RAM) is a volatile memory that stores information on an intergrated circuit used by the operating system ,software and hardware.What is volatile? Volatile is a characteristic that make the memory to stop functioning when there is no power supply.But  READ ONLY MEMORY(ROM) can still functioning well although there is no electricity. Well, this is because the ROM is sustained by a small long-life battery in a computer.

INTERNAL MEMORY: processor has  its own local memory inform of register .The example is, cache is a form internal memory else RAM,ROM.

EXTERNAL MEMORY: form of rewritable permanent storage,specifically one using a system called flash memory.

                     

For the internal memory,expressed in term of bytes(1byte = 8 bits).

Semiconductor memory

magnetic surface memory

Optical

Magneto-optical

Memory Hierarchy

 Cache memory principle

Noted:It will become faster when it is closer the CPU.                                                        

MAPPING FUNCTION: Because the are fewer cache lines than main memory blocks , an algorithm is needed for mapping main memory blocks into cache lines.

Three techniques can be used:

·       Direct mapping

·       Set associative mapping

·       fully associative mapping

·       Direct mapped

·       2-way set associative

·       fully associative 

       Noted:if the early number is same it will HIT

      Noted: if the early number is same it will HIT

Thats all..thank you.