EGR 224/Digital Logic Lab

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The following page provides some supplemental information for the Digital Logic lab for EGR 224L. It has been updated to Spring, 2016.

Changes

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Troubleshooting

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Images

Tunneling - The Legal Kind

The following image shows the seven tunnels and their connections to the 7-segment display in Logisim. It also shows the "a" tunnel connected to the "a" output wire. Note that the easiest way to create the tunnels is to first connect them all to the 7-segment display then to label them individually. Once those seven are done, select all of them and make a copy - you will now have one more tunnel for each label. Move the copies near their respective output wires and connect the tunnel to an output. Note that the bottom right port on the 7-segment display would be for the decimal point if needed.

SevenSegmentTunnels.PNG

Tunneling Gone Bad

The image below shows two cases where there are two tunnels with the same label connected to outputs. In the top two cases, the two logical expressions to which "a" tunnels are connected are the same value, and so the other "a" tunnel on the right is able to replicate the value. In the bottom two cases, the two logical expressions to which "b" tunnels are connected are different, and so Logisim throws an error on everything connected to that set of tunnels. Remember that "off" is darker green, not red -- red wires only happen when there is inconsistent logic.

GoodBadTunnel.PNG

Questions

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External Links

References