Assume the main memory size is $32$ bytes. One word has one byte. Main memory block size is $4$ words.

The cache memory has $4$ lines. The cache line size is $32$ bits. Direct mapping is used. The tags of cache

lines are shown as follows:

Cache Line Id Tag

$01$

$10$

$21$

$30$

$1.$ How many bits at least are needed for memory addresses? Why?

$2.$ How many bits in the memory address are needed to identify words? Why?

$3.$ How many bits in the memory address are needed to identify cache lines? Why?

$4.$ If The CPU needs to access the information contained in memory address $2910.$ Will it be a miss

or hit? Explain your answer.