Where is the input

Thread Starter

Schoen85

Joined Jul 30, 2013
3
Greatings,

I am new to circuit design and dont know if there is a reason for an output to be tied to another output in this manner. If you could tell me why the highlighted green line is connected to these gates but not to an input. I feel this has to be a mistake.




I got this picture from here. The complete circuit describes a 7 seg display encoder.
 
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