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What precisely is the difference between memory cycles and Cpu Cycles ?

When we say how many memory cycles are needed or how many CPU Cycles are needed what exactly does it mean?
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Memory cycles - Number of cycles you consumed to access the memory. Like for transferring one word you need 2 memory cycle.
Cpu cycles - Number of Cpu cycles you consumed for doing the processing. Like Addition, the operation takes 2 CPU cycles.

Now any instruction can be a combination of both memory cycles or cpu cycles.
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