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Direct Mapping Problems 2, CAO, CSE, GATE Video Lecture - Computer Science Engineering (CSE)

FAQs on Direct Mapping Problems 2, CAO, CSE, GATE Video Lecture - Computer Science Engineering (CSE)

1. What is direct mapping in computer architecture?

Ans. Direct mapping is a technique used in computer architecture to map data from the main memory to the cache memory. In this technique, each block of main memory is mapped to a specific cache line using a direct mapping function. This function determines the cache line where the data should be stored based on its memory address.

2. How does direct mapping work in cache memory?

Ans. In direct mapping, each block of main memory is assigned to a specific cache line using a direct mapping function. This function uses a specific formula to determine the cache line where the data should be stored based on its memory address. When a memory access is requested, the cache controller checks if the data is present in the cache by comparing the memory address with the stored addresses in the cache lines. If a match is found, it is a cache hit and the data is retrieved from the cache. If no match is found, it is a cache miss and the data is fetched from the main memory and stored in the corresponding cache line.

3. What are the advantages of direct mapping in cache memory?

Ans. Direct mapping has several advantages in cache memory design. Firstly, it is simple to implement as it requires only a basic mapping function and comparison logic. Secondly, it provides a fast access time as the cache controller can quickly determine the location of the data in the cache using the direct mapping function. Finally, it allows for a higher cache hit rate compared to other mapping techniques like associative mapping, as each block of main memory is mapped to a specific cache line, reducing the chances of conflicts.

4. What are the limitations of direct mapping in cache memory?

Ans. Direct mapping also has some limitations in cache memory design. One limitation is that it can lead to cache conflicts. Since each block of main memory is mapped to a specific cache line, if multiple memory blocks are mapped to the same cache line, conflicts occur when trying to store new data in that cache line. This can result in cache thrashing, where cache lines are frequently replaced, leading to a decrease in cache performance. Another limitation is that direct mapping cannot utilize the entire cache memory efficiently as some cache lines may remain unused due to the specific mapping function.

5. How is cache performance affected by direct mapping?

Ans. Cache performance in direct mapping can be affected by cache conflicts and cache thrashing. Cache conflicts occur when multiple memory blocks are mapped to the same cache line, resulting in frequent cache misses and slower performance. Cache thrashing occurs when cache lines are frequently replaced due to conflicts, leading to a decrease in cache efficiency and performance. However, if the data access pattern exhibits good locality, direct mapping can provide a high cache hit rate and improve overall system performance. It is important to carefully design the cache size and mapping function to mitigate the impact of conflicts and thrashing on cache performance.

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Sep 20, 2025 Last updated

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