Re: building boolean gates
- From: John Popelish <jpopelish@xxxxxxxx>
- Date: Fri, 25 Jul 2008 17:08:09 -0400
Bernd Schneider wrote:
Hi all,
I am trying to build the following two linear gates from basic boolean gates (XOR, NOT, AND, OR):
1. Enable gate with the following truth table where u,s,e are the inputs and w is the output
u s e w 0 0 0 0 0 0 1 0 0 1 0 1 0 1 1 0 1 0 0 0
1 0 1 1
1 1 0 1
1 1 1 1 Basically what the gate does is if e=0 then it outputs s and if e=1 then it outputs u.
Have you seen "And Or Select" gates? This is what they do.
http://www.st.com/stonline/products/literature/ds/2034/hcf4019.pdf
2. This time I have a gate with 4 inputs r,e,s,t and two outputs c and c'
The outputs are computed as follows:
if e=1 then c=r XOR t and c' = NOT(r XOR t)
if e=0 then c=c'=s
Again, the And Or Select form with the addition of a Not Xor gate pair looks pretty good.
The first gate should not use any non-linear operation (i.e. not AND and OR) together with the u signal and the second gadget should not involve t in a non-linear operation. Both gadgets look pretty linear to me, so I hope this is somehow possible.
How can I "implement" these gadgets?
--
Regards,
John Popelish
.
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