$1\mathrm{.}3$ Bi$-$directional Bus

A bi$-$directional bus is a bus where the flow of data can occur in both directions. This can be

realized by e$.$g$.$ placing the inputs and outputs of the component $74$LS$374$ on a mutual bus.

In this case, the data that is placed on the bus is supposed to be stored by the component and

outputted in the next phase.

This can of course result in a bus conflict, e$.$g$.$ when a data word is placed on the bus and

simultaneously the bus is supposed to read out data which is stored in the component

$74$LS$374.$ This would mean that two transmitters exist: the component $74$LS$374$ on the one

hand and the user of Workview who is trying to place data on the bus on the other hand.

In order to avoid a bus conflict, the bus needs to be placed into a state of high impedance by

using the letter $"$Z$"$ as an in put. Now, the data can be outputted from the component.

The following is the impulse diagram of the simulation:

Figure $1$: Impulse Diagram

Explain the simulation steps by using the impulse diagram $($Step size $=100ns)$ and the data

sheet for the $74$LS$374.$

Q$11$: In which time frame is the data placed on the bus?

Q$12$: In which time frame is the data stored in the component $74$LS$374?$

Q$13$: In which time frame is the data read out of the component $74$LS$374?$

Q$14$: In which time frame does the bus conflict take place? How could that have been avoided?