ITPEC FE Morning October 2018 Question 14
ITPEC FE Morning October 2018 — Question 14 of 80
Cache Memory Effect — cache stores copies of data from main memory for faster repeated access.
Cache sits between the CPU and main memory:
- CPU reads data from main memory → stored in cache
- Next time CPU needs the same data → reads from fast cache instead of slow main memory
Why not others:
- (a) Parallel processing in cache — cache does not process instructions; that's the CPU pipeline's job
- (c) Simultaneous read of instructions and data — cache's purpose is fast repeated access, not simultaneous reading from main memory
- (d) Decoding and executing in cache — decoding/execution happens in the CPU (ALU, control unit), not in cache
Key rule: Cache = fast storage for reuse. It does NOT compute, decode, or execute anything.
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