total size of memory system

Question

A memory system has a total of 8 memory chips each with 12 address lines and 4 data lines. The total size of memory system is

a) 6 KB b)32 KB c)48 KB d)64 KB

Answer 1

8 memory chips

each require 12 address lines and 4 data lines

Total size of memory=(8⨉2¹²⨉4)/8 =2¹⁴B =16KB

Answer 2

since 4 data lines .we can have 16 bit in one line. since memory can be byte addressable in general in line we have 2 byte

so one chip size will be = number of address lines*line size

                                   =  2^12*2B= 2^13B

and we have 8 such memory chips 

so total size will be=2^3*2^13B=2^16B=64KB

option d is correct

Comments

yes this answer 99.5% correct

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no u misread the question...to select one line we need one bit

so 4 data line means 4 bit to be selected from one line

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you said we have 16 bits in one line and we have 4 data lines , so shouldn't it be 4*16 = 64bits(8B) dataline ??