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How many address bits are required for a RAM with a capacity of 128 words of 8 but each?

A.
7
B.
8
C.
128
D.
16

Solution:

The correct answer is 7. Steps to calculate the required RAM:Step 1: calculate the length of the address in bits (n bits) Step 2: calculate the number of memory locations 2^n(bits) Step 3: take the number of memory locations and multiply it by the Byte size of the memory cells. We can write 128 x 8 RAM chip as 27 x 8, every RAM chip will need a 7-bit address. We will connect the remaining 7-bit address line to every RAM. Hence, the correct answer is 7.

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