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The document discusses computer memory caches. Caches are small amounts of fast memory located either in the processor (L1 cache) or between the processor and main memory (L2 cache). Caches store copies of frequently used portions of main memory that are closer to the processor, allowing faster access than retrieving data from regular memory. Cache size is typically smaller than main memory, such as 256kb or 512kb, and acts as temporary storage.
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- 2. Cache Main Memory Address 00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 0000100111100011 00110011 00001110 11110000 11110011 11001010 11001100 00000011 00010001 01000000 Cache Memory 10000000 10000001 10000010 10000011 Address • small amount of fast access memory either: • built into the processor (L1 cache) OR • between the processor and memory (L2 cache) • physically closer to the processor than RAM so faster
- 3. Cache Main Memory Address 00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 0000100111100011 00110011 00001110 11110000 11110011 11001010 11001100 00000011 00010001 01000000 Cache Memory 10000000 10000001 10000010 10000011 Address • stores a copied portion of main memory which the processor may need to access • cache is temporary storage • cache size is smaller than memory, typically 256kb or 512kb
- 4. Access Speed The speed at which data can be accessed depends on the distance between it and the processor Registers Cache memory RAM Faster access Slower access