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Universal gates

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shekiboy

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Which gate apart from NAND and NOR can work as universal gate
 
For that matter I cann't even make a Not gate of XORs,I need combination of both XOR and XNOR
 
shekiboy said:
For that matter I cann't even make a Not gate of XORs,I need combination of both XOR and XNOR
To make a NOT gate from an XOR, you just need to tie the other input high.
But it's news to me that you can use the XOR as a fundamental building block, as you can with the NAND (or the NOR). Do you have any examples?
 
John Brown is correct on making an inverter(Not) by tying one input to logic 1. It appears that I was mistaken about XOR being functionally complete.
 
I've given this proof on another board that XOR is not universal.

A two-input XOR is a parity generator. Cascading parity generators creates only parity generators. An AND gate is not a parity generator. Therefore, you can't make an AND gate with XORs alone.
 
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