Question

How is the word size of RAM and its capacity related to number of addressing bits? A RAM has a capacity of 1M words having the word size of 32 bits and supports byte addressing.

Answer 1

If we want the RAM to be word addressible, then a processor with n address bits,  can address  2^n  words in the RAM.

RAM has  capacity 1 Mega words. = 1024 words = 2^10 words.
Each  word size = 32 bits or  4 bytes.

1)  data input lines/output lines:
                32 as many as the number of bits in a word
2)  address lines needed:  
              since there are 2^10 words total,   we need 10 address lines.

Answer 2

If we want the RAM to be word addressible, then a processor with n address bits,  can address  2^n  words in the RAM.

RAM has  capacity 1 Mega words. = 1024 words = 2^10 words.
Each  word size = 32 bits or  4 bytes.

1)  data input lines/output lines:
                32 as many as the number of bits in a word
2)  address lines needed:  
              since there are 2^10 words total,   we need 10 address lines.