There are two memory chips $M1$ and $M2$ as shown in figure below, containing $4$ registers each. What is the minimum number of address lines needed to address these registers? Show how you will connect and address these chips. You can use the following inputs to the chips: Address lines $A_0,A_1,A_2$ etc.; Chip Select $\frac{?}{\text{b}\text{a}\text{r}}(CS)$; Read enable $\frac{?}{\text{b}\text{a}\text{r}}(RD)$; and Write enable $\frac{?}{\text{b}\text{a}\text{r}}(WR).$ Show at least two different ways of connecting them.

$\frac{\text{I}}{O}$ lines

I$/$O linesSee