(01-10-2015, 10:43 PM)Nuuppanaani Wrote:Firstly, you'd have to come up with a diagonal LFA, and also for C1 step (handling 4 bits) you'd need a diagonal carry AND propagation.(01-08-2015, 01:20 PM)snugglycreeper9 Wrote: The purpose of PLA is it to be horizontal and fast...
I agree with it being supposed to be fast, but WTF, how does the logic in the adder have anything to do with its physical shape? PLA can be built diagonal or vertical too? Seriously I want to hear your thoughts on this, why does PLA have to be horizontal when so many people prefer diagonal (or vertical in this case)?
Also, if you need diagonal adders, go to CLE, it's the same speed, and won't take nearly as much space. However, we never had really any 4 tick horizontal SS adders, which is what cut and embi went for when designing it...
If you meant VERTICAL, good luck designing a vertical LFA, then removing the first two bit calculations and making them 4 bit propagation and carry systems...