How many 32x16 ROMs with enable will be required to construct a

How many 32x16 ROMs with enable will be required to construct a 128x16 ROM and What type of decoder will you need for this design? 

(A) 4, 2 to 4 decoder
(B) 4, 4 to 16 decoder
(C) 8, 2 to 4 decoder
(D) 8, 4 to 16 decoder

Answer: A
 

1Comment
Akshay Saxena @akshay0612 11 Jan 2018 11:30 am

\(\frac{128 \times 16}{32 \times 16}=4\)Rows
To address any row we need \(2\) bits.
Therefore \( 2 \ to \ 4\) decoder will suffice.