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Doubt Cache memory

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Consider a machine with 8-way set associative cache of size 4k bytes,Line size is 16 bytes.The 20 bit physical address main-memory is used to store A[64][64] array in RMO from 0xFF000.A program to be run is given below .Element size is 8 bytes

Double A[64][64]
for(i=0;i<64;i++)
{
  for(j=0;j<64;j++)
   {
     A[i][j]=0.0;
   }
}

a) Which array elements share same address space?

b)Hit ratio of above cache when stored in RMO and CMO?

Provide detailed explanation 

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