4 Consider an XYZ microprocessor with 16 Kbyte L1 cache. The miss rate for this cache is 36 and the hit time is 2 cc. That microprocessor also has an 8 Mbyte, on-chip L2 cache. 95% of the time, data request to L2 cache are found and its hit time is 14 cc. If data is not found in L2 cache, a request is made to a 4Gbyte main memory. The miss penalty at main memory is 1000cc and its hit time is 1.5ce. On average, the memory access time for the main memory is 3.5cc. Explain what is the cache memory and its Calculate the percentage of data found in main memory (hit rate). Memory Type Parameter L1 cache 16Kbyte L2 cache purpose. 8Mbyte Main Memory 4GB Miss rate Hit time Hit rate Hit time Miss penalty AMAT Hit time Value 3% 2cc 95% 14cc 1000cc 3.5 cc 1.5 cc Calculate the average memory access time for this system.

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Chapter4: Processor Technology And Architecture
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4 Consider an XYZ microprocessor with 16 Kbyte L1 cache. The miss rate for this cache is 36
and the hit time is 2 cc. That microprocessor also has an 8 Mbyte, on-chip L2 cache. 95% of
the time, data request to L2 cache are found and its hit time is 14 cc. If data is not found in
L2 cache, a request is made to a 4Gbyte main memory. The miss penalty at main memory is
1000cc and its hit time is 1.5cc. On average, the memory access time for the main memory
is 3.5cc.
(a)
Explain what is the cache memory and its' purpose.
(b)
Calculate the percentage of data found in main memory (hit rate).
Parameter
Memory Type
L1 cache
16Kbyte
L2 cache
8Mbyte
Main Memory
4GB
Miss rate
Hit time
Hit rate
Hit time
Miss penalty
AMAT
Hit time
Value
3%
2cc
95%
14cc
1000cc
3.5 cc
1.5 cc
Calculate the average memory access time for this system.
Transcribed Image Text:4 Consider an XYZ microprocessor with 16 Kbyte L1 cache. The miss rate for this cache is 36 and the hit time is 2 cc. That microprocessor also has an 8 Mbyte, on-chip L2 cache. 95% of the time, data request to L2 cache are found and its hit time is 14 cc. If data is not found in L2 cache, a request is made to a 4Gbyte main memory. The miss penalty at main memory is 1000cc and its hit time is 1.5cc. On average, the memory access time for the main memory is 3.5cc. (a) Explain what is the cache memory and its' purpose. (b) Calculate the percentage of data found in main memory (hit rate). Parameter Memory Type L1 cache 16Kbyte L2 cache 8Mbyte Main Memory 4GB Miss rate Hit time Hit rate Hit time Miss penalty AMAT Hit time Value 3% 2cc 95% 14cc 1000cc 3.5 cc 1.5 cc Calculate the average memory access time for this system.
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