5. Direct Mapped Cache Organization
The chapter focuses on the organization and function of direct mapped cache in computer memory systems. It discusses how memory addresses are structured, cache hits and misses, and how data is retrieved from cache versus main memory. Various examples illustrate how data is managed within a direct mapped cache, providing insight into both theoretical and practical aspects of cache operation.
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Sections
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What we have learnt
- The structure of a memory address includes bits for tag, cache index, and word offset.
- Cache hits occur when the requested data is already in the cache, while cache misses require fetching data from main memory.
- The design of a caching system impacts the efficiency of data retrieval in computing systems.
Key Concepts
- -- Cache Memory
- A type of high-speed volatile memory that provides high-speed data access to the processor by storing frequently accessed data.
- -- Cache Hit
- Occurs when the required data is found in the cache, leading to faster data retrieval.
- -- Cache Miss
- Occurs when the required data is not found in the cache, necessitating a fetch from main memory.
- -- Direct Mapped Cache
- A cache structure where each block of main memory maps to exactly one cache line.
- -- Locality of Reference
- A principle stating that programs tend to access a relatively small portion of memory at any given time.
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