4 logic operations in one IC. help with LogicWorks.

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TheSpArK505

Joined Sep 25, 2013
126
I,m working on an IC circuit that compares,adds,subtracts and multiply. Each operation at a time. It's obvious that I need a decoder to "pick" an opearation according to it's inputs.
It seems complicated but it's not. Now I have every thing prepeared,but when I want to simulate it with LogicWorks5 here the problems begin.

I don,t know how to design an enable input that is connected to the outputs of the decoder,So that only the picked IC works.

So,if anyone familiar with logicworks5 please help me please with how to design an IC with an enable input?????

Thank you.
 

ScottWang

Joined Aug 23, 2012
7,397
An enable signal just like using "1" to enable one input of AND or NAND gate, and using "0" to disable, if you want then you can also using "0" to enable one input of OR or NOR gate, and using "1" to disable.

74LS138 datasheet, to see the page 2 - Logic Diagrams.
 
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