COA-2010-PYQs-MCQ-2-mark- MODULE. 7COA

A computer system has an L1 cache, an L2 cache, and a main memory unit connected as shown below:

• Block size in L1 cache: 4 words
• Block size in L2 cache: 16 words
• Memory access times:
  • L1 cache: 2 nanoseconds
  • L2 cache: 20 nanoseconds
  • Main memory: 200 nanoseconds

If there is a miss in the L1 cache and a hit in the L2 cache, a block is transferred from the L2 cache to the L1 cache.

What is the time taken for this transfer?
[GATE 2010 || MCQ || 2 marks]