Activity 2: Understanding the Limits of Direct-Mapped Cache Organization Flush the cache memory by clicking the "FLUSH" button. Insert the following instructions after the last LDB instruction in the program from Activity 1: LDB 17, R00 LDB 33, R00 Execute the following instructions individually, one by one: LDB 0, R00 LDB 17, R00 LDB 33, R00 4. What is the main cause of the high number of cache misses in this activity? (3 pts)

Question

Activity 2: Understanding the Limits of Direct-Mapped Cache Organization Flush the cache memory by clicking the "FLUSH" button.  Insert the following instructions after the last LDB instruction in the program from Activity 1: LDB 17, R00    LDB 33, R00 Execute the following instructions individually, one by one:  LDB 0, R00   LDB 17, R00   LDB 33, R00 4. What is the main cause of the high number of cache misses in this activity? (3 pts)

Accepted Answer

c.  
 The high number of cache misses is mainly caused by conflict misses in the direct-mapped cache.  In a direct-mapped cache, each memory block can be placed in only one specific cache line. The addresses 0, 17, and 33 map to the same cache line. As a result, each new access replaces the previous block stored in that line.  This repeated replacement causes frequent cache misses, even when the same addresses are accessed repeatedly.

Answer

a.  
 
 The cache is too small and cannot store the required data.

Answer

b.  
 
 The data read are not written correctly into the cache memory.

Answer

d.  The processor cannot access the data in memory.

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