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I need some help with a project. The project wants me to create a 7-Segment display using standard logic gates, AND, OR, NOT, NAND, NOR, XOR, and XNOR. Any suggestions? The last 6 inputs on the table will be a period as the output. Help please!!!
First, what is a "Logisim"?
4 binary signals? Like BCD
Try a BCD to decimal decoder like the 7445
or the BCD to seven segment decoder/driver like the 7447.
You need another level of logic to recognize the numbers from 11 to 15 and exclude those inputs from reaching the display while turning on the decimal.
If you have the TTL Databook, it shows the logic diagram for the 7447, 74154 and the required logic gates. For the dot output, you can use a 7430 8-input NAND gate ( unused inputs tied to VCC or ground) with the inputs decoded to give a logic zero output, feeding the decimal point.
Forget logic simulators. There are 16 possable input combination. Each segment lights for one or more of these combinations. Use AND gates to select each possable input combination for a particular segment. Then OR these outputs and run that to the segment.
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