Figure $1$: Data transfer via a bus

Q$22$: Why are the pins $9,10($DE in the circuit$)$ as well as $1,2($O$1,$ O$2$ in the circuit$)$ connected

with each other? Which functions do the inputs have?

Q$23$: What is the task of pin $15$ at the register?

Q$24$: Which state should be at the output of the $4-$bit register $($register $1$ or $2)$ to avoid that the

$44$ bit storage saves a wrong word? Which are the allocated inputs for this?

Q$25$: Which state does an output control need to have for storing data in register $1$ and register

$2?$

Q$26$: Can O$1$ and O$2$ be simultaneously set to a logic $1?$ Which inputs need to be set to a logic

one for realizing part c$)?$ In which state are $D_{1.\mathrm{.}4}?$

Q$27$: Create the simulation table.

Q$28$: Derive the input signals to accomplish the above given simulation.