Computer Architecture · Unit 9 · 4 hrs
Memory Organization
Exam-focused notes for Memory Organization (Computer Architecture, CSC213): what the TU syllabus asks and how it has actually been tested, with 8 solved past questions from this unit.
What this unit covers
- Memory Hierarchy, Main Memory, RAM and ROM Chips, Memory address Map, Memory Connection to CPU, Auxiliary Memory (magnetic Disk, Magnetic Tape)
- Associative Memory: Hardware Organization, Match Logic, Read Operation, Write Operation
- Cache Memory: Locality of Reference, Hit & Miss Ratio, Mapping, Write Policies
Cache Memory
What is meant by cache mapping? Explain working of direct mapping with suitable block diagram. [5]
Cache mapping refers to the technique or procedure by which the contents of main memory blocks are mapped (assigned) to cache memory locations. Since cache memory is much smaller than main memory, a mapping function is needed to determine which cache locati...
Full solved answer →What is cache memory? Explain the elements of cache design. [5]
Cache memory is a fast, small-capacity memory that holds the information most likely to be accessed by the CPU. Its access time is less than the access time of main memory by a factor of 5 to 10. Cache is the fastest component in the memory hierarchy and is...
Full solved answer →What is cache memory? Explain the mapping process. Differentiate between direct mapping and associate mapping.[10]
Cache memory is a small, high-speed memory placed between the CPU and main memory (RAM). Its purpose is to store frequently used instructions and data so that the CPU can access them faster, reducing the average time needed to access data from main memory. ...
Full solved answer →What are the advantage and disadvantage of direct mapping and associative mapping between cache and main memory? [5]
In direct mapping, each main memory location can only be copied into one specific location in the cache. Main memory is divided into pages that correspond in size with the cache, and each memory block maps to exactly one cache line determined by its address...
Full solved answer →Give the appropriate reasons why replacement algorithm is required in associative mapping? [5]
In associative mapping, any block from main memory can be loaded into any line (slot) of the cache. This is the most flexible cache organization because there is no restriction on placement. However, this very flexibility creates a critical problem that mak...
Full solved answer →Explain the mapping process. Differentiate between direct mapping and associate mapping.[10]
A mapping process is one of the key sequencing techniques used in a microprogrammed control unit. It provides: "A mapping process from the bits of the instruction to an address for control memory." In this context, the mapping process converts the operation...
Full solved answer →Associative Memory
Define associative memory. Explain with block diagram how it can be implemented. [5]
Associative memory (also called Content Addressable Memory or CAM) is a type of memory in which the stored data is accessed based on its content rather than by a specific address. Instead of supplying an address to retrieve data, the user supplies a portion...
Full solved answer →Memory Hierarchy, Main Memory, RAM and ROM Chips, Memory address Map, Memory Connection to CPU, Auxiliary Memory
What are the main characteristics of memory system? Explain [6]
A memory system in a computer is characterized by several key properties that determine its performance, capacity, and suitability for different purposes. These characteristics help in understanding the trade-offs between speed, cost, and capacity in a memo...
Full solved answer →Make Unit 9 stick
Practice CSC213 with flashcards & quizzes