MASTER OF COMPUTER APPLICATIONS
Course Code : MCS-012
Course Title : Computer Organisation and Assembly Language Programming
Assignment Number : MCA (2)/012/Assign /2014-15
Maximum Marks : 100
Weightage : 25%
A computer has 512 words RAM with a word size of 32 bits and a cache memory of 8 Blocks with block size of 64 bits. Draw a diagram to show the address mapping of RAM and Cache, if
(i) Direct cache mapping is used
(ii) Associative cache mapping is used, and
(iii) Two way set associative mapping scheme is used.
Main memory Size = 512 Words
Main Memory word size = 32 bits
Cache Memory Size = 8 Blocks
Cache Memory Block size = 64 bits
⇒1 Block of Cache = 2 Words of RAM
⇒ Total number of possible Blocks in Main Memory = 512/8 = 64 block
The block can be anywhere in the cache.
Size of Cache = 8 blocks
Location of Block 12 in Cache = 12 modulo 8 = 4
2 Way set associative mapping:
Number of blocks in a set = 2
Number of sets = Size of Cache in blocks / Number of blocks in a set
= 8 / 2 = 4
Block 12 will be located anywhere in (12 modulo 4) set, that is set 0.