Lab Assignment

RAM

Objectives

Study and implement RAM

In MultiSim

We will be using a MultiSim circuit that uses a $2K$ byte by $8$ bit RAM chip.

On Campus

We will be using the $7489$ RAM chip.

Procedure:

Construct the appropriate circuit $($MultiSim or On$-$Campus$)$ and store the following information on the RAM chip:

Memory Location Data to store

$0$

$5$

$1$

$2$

$7$

$3$

$9$

$11$

Storing the data:

To store the data, you must convert the above numbers into binary, then set up the correct address and data switches, then for each of the above...

On the MultiSim version, bring the Chip Select $($CS$)$ value to high, and the Write Enable $($WE$)$ value to high. This will write the data to that address.

On the $7489$ version, bring the Memory Enable $($ME$\text{'})$ value to low, and the Write Enable $($WE$\text{'})$ value to low.

Retrieving the data:

To retrieve the data, you must set up the correct address switches, then for each of the above...

On the MultiSim version, bring the Chip Select $($CS$)$ value to high, and the Write Enable $($WE$)$ value to high. This will write the data to that address.

On the $7489$ version, bring the Memory Enable $($ME$\text{'})$ value to low, and the Write Enable $($WE$\text{'})$ value to low.

Retrieving the data:

To retrieve the data, you must set up the correct address switches, then for each of the above...

On the MultiSim version, bring the Chip Select $($CS$)$ value to high, and the Write Enable $($WE$)$ value to low. This will display the data at that address.

On the $7489$ version, bring the Memory Enable $($ME$\text{'})$ value to low. Note, this will output the inverse of the data, so this is why you'll need four NOT gates $($hence the $7404$ NOT gates shown in the circuit diagram$).$

Circuit Diagrams

MultiSim circuit

NOTE: The following components may be new to you...

$J1$ and $J2$ are Jumper style DIP switches $($just a way to pack a bunch of switches together in a small package$).$ You can turn each one on or off by clicking on the corresponding number $(1$ through $8)$ that appears when you click on the DIP switch. It's up to you to figure out how to enter the correct binary address and data.

R$1$ and R$2$ are Resistor Packs, just a way to pack in a bunch of resistors into a small area. All the resistors are $330$ Ohms.

On Campus Circuit

IVU I E: I ne IOHowing nints...

If you are using the Digital Trainer Box, you'll have the eight switches, and the two temporary push switches for ME$\text{'}$ and WE$\text{'},$ but make sure they are wired correctly. You can also use the ELVIS board switches if you are using ELVIS.

If you are using the Digital Trainer Board or ELVIS, you may not need to use the resistors in series with the LED's $($They are built in$).$

Information to Submit

Please submit a formal lab report.

Please provide screenshots $/$ photos of the circuit, clearly showing the four addresses $($switch positions$)$ and the corresponding four outputs $($LED lights$).$

Please provide an explanation of the functions and usage of each of the pins of the chip $($you do not need to explain the $7404$ NOT gate chip$).$

Please provide a selfie of yourself and the constructed circuit in the background. If you have teammates, all teammate faces must be clear in the selfie, and also show the constructed circuit in the background.

Have fun!