A certain system includes 4 Gigabytes of central memory and also employs a 768 Kbyte instruction cache each of whose lines can hold 128 instructions.
How many bits would be required for the set number if this instruction cache is organized as a 4-way set associative cache?
And... why don't you know how to solve this problem? Do you know what the "set number" is? What a 4-way set associative cache is? What a gigabyte is?
Why do you not know how to solve this problem?
While your homework was probably already due a while ago, one of the more helpful explanations on this stuff is here:
http://codingfreak.blogspot.com/2009/03/cache-memory-set-associative-mapped.html
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