SoI need help with assignemnt $3$ but I will provide assignemnt $2$ as context, and Note: In $2,$ I got $0/1$ beacasue I was told "why are you using the built$-$in counter? I specifically said not to do that, continue from prior assignment. We can't use the built$-$in counter for following assignments"$soin$ assignent $3noin$ built counter but this is it: Continuing from assignment $2,$ we now want to be able to read the stored values from the ram $($instruction memory$),$ decode the values, and control some logic based on that decoding.

Specifically, lets use a specific bit of the ram output to switch a multiplexer between displaying two constant $4-$bit values.

Steps:

a$)$ Remove the random generator from the ram input, and set the $\text{'}$str$\text{'}$ pin to ground. We will only be manually modifying the content of the this ram from now on$,$ and thus don't need the input to be connected anywhere.

b$)$ Add a bus splitter to the ram's output to extract bit $\text{'}2\text{'}$ from it$.$ How do we do this? It's a single bit we want. Remember that bit $\text{'}0\text{'}$ is the least significant bit $($LSB$).$

c$)$ Add two $4-$bit 'constant' modules to your circuit, and set one to the value $0$xE and the other to $0$x$6.$

d$)$ Add a $2-$way $4-$bit multiplexer to your circuit $($hint: set its "select bits" to $1,$ and its "data bits" to $4).$ And to make things easier set its "include enable" field to $\text{'}$No$\text{'}.$ Connect your two constants to its $2$ input buses, $0$xE to input$0$ and $0$x$6$ to input$1.$ Connect the multiplexer's "select pin" $($the one with a dot next to it$)$ to the bit you extracted in step $($b$)$ above.

e$)$ Add a hex display, and connect it to the output of the multiplexer.

f$)$ Finally, modify the content of the ram $($by right clicking on it and selecting "edit content"$)$ to generate the following sequence on the output when the clock is enabled and the program counter starts incrementing from zero: E$,6,$E$,$E$,6,$E$,$E$,$E$,6.$ Make sure your circuit is not overwriting the ram content when the counter advances. aslo this was assignemnt $2.$ just $noin$ built counter lets create a "memory walker", which stores random values to consecutive addresses in a Ram.

Steps: A$)$ Add a Ram unit $($available under the "Memory" group$)$ to the simulation area. Configure it to have $16$ address bits, and $8$ data bits, and to have separate load$/$store ports. B$)$ Change the counter we designed in last assignment to have $16$ bits instead of $8$ bits $($what needs to change for this?$).$ You can remove the hex displays at the counter output, or expand them to cover the $16$ bits. C$)$ Connect the output of the counter to the Address bus of the Ram. D$)$ Add an $8-$bit Random Generator $($under "Memory"$)$ to the circuit and connect its output to the data Input of the ram. Don't forget to connect the clock generator to all units that need it$.$ Set the write signal on the Ram to "high", so that data will be written to it$.$