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if statement using digital hardware

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EMmME

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Hello,
I know its a kind of a stupid question. But how can i construct an if statement with digital blocks such as ANDs, flip flop....etc. I would be thankful if a layout is included
 

An if/else structure can be realized using a mux.
 

and the question is now how it is "synthesized"

If addwithcarry=1
then s=a+b+1
else s=a+b
end

So is the carry input "cin" into a single adder set to cin=addwithcarry or is the addwithcarry variable used to select the MUX of two parallel adders. One with carry and one without.

s1=a+b;
s2=a+b+1;

s=mux(s1,s2,addwithcarry)

I am not an expert in digital synthesis but I have seen digital designers making schematics on paper to code in a proper way for an optimum area and speed.
 

in this case I would think:

s=a+b+addwithcarry

You do not need any more logic...
 

Here is an **broken link removed**. You not only see how to build it, you can play with it. Plus the accompanying article explains how to use it.

Good luck.
 

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