It seems to me that that is a parity check.

                                  Jim

> This one is making me go crazy. I know there is a well-known solution 
> for detecting the number of 'ones' in a byte using logic gates (just as
>  you might use XOR's for parity check) but I just can't simply
> remember!
> 
> Do any of you guys do remember it?
> 
> Regards,
> 
> *Carlos Marcano*
> -Guri, Venezuela-
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