Part$-3$: Description

In this part of the lab, you will create a data path for the ALU you build in Part$-1.$ This data path will consist of $4$ registers.

In this lab, we are using the register components. Refer to playwithRegister.dig to get a good starting idea of how this component works.

You will need to address $1$ register via the interface select signals to determine which $4-$bit register to write the input value to$.$ Then using the D$-$Flip$-$flops in Digital.

You will use only one Clock Input to keep the circuit synchronized. That is$,$ with Clock$=0,$ set up your register write values. Once the values are set up$,$ set Clock to $1.$ For this lab, a manual setting of clock signal from $0$ to $1$ is needed. Do not create a periodic clock signal.

Part$-3$: User Interface

You are provided an interface file lab$2\_$part$3.$dig, start Part$-3$ from this file. You are not permitted to edit the content inside the dotted lines rectangles.

Figure: lab$2\_$part$3.$dig Interface

Part$-3$: Example

In this design, the user can choose out of the $4$ registers where to store the $4-$bit value which needs to be rotated $($inA from part$-1)$ and also which register to store the rotation amount $($inB from part$-1),$ using the selwrite register selection inputs. The user ensures they direct these two registers to the correct Register Selection: Read From values for inA

and inB inputs values to the ALU.

In the figure above, we have written the value $5$ to Register $3$ and the value $1$ to Register $1.$ Then, we read from Register $3$ the value $5$ to ALU input A and read from Register $1$ the value $1$ to ALU input B$.$ Rotating $5$ left by $1$ b it results in $\{1,0,1,0\}$ displayed in the ALU Output as hexadecimal A$.$