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Imagine a CPU that skips the decode step and tries to execute instructions immediately after fetching. What problem would most likely occur?

hard📝 Application Q15 of 15
Intro to Computing - How Hardware Works
Imagine a CPU that skips the decode step and tries to execute instructions immediately after fetching. What problem would most likely occur?
AThe CPU would only fetch data but never execute
BThe CPU would run faster without any issues
CThe CPU would store instructions instead of executing
DThe CPU would execute incorrect or meaningless instructions
Step-by-Step Solution
Solution:
  1. Step 1: Understand the role of decoding

    Decoding translates fetched instructions into signals the CPU can understand and act on.
  2. Step 2: Predict the effect of skipping decode

    If decoding is skipped, the CPU cannot understand instructions properly, leading to incorrect or meaningless execution.
  3. Final Answer:

    The CPU would execute incorrect or meaningless instructions -> Option D
  4. Quick Check:

    Decode step is essential for correct execution [OK]
Quick Trick: Decode translates instructions; skipping causes errors [OK]
Common Mistakes:
  • Assuming skipping decode speeds up CPU without issues
  • Thinking CPU just stores instructions if decode skipped
  • Believing fetch alone is enough for execution

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