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+---- Thread: 4 BIT 2 Wide Full Adder (/thread-515.html)
4 BIT 2 Wide Full Adder - bametje12 - 07-07-2013
Hello guys
i recently build this Adder i wanna know what you guys think about it
Specs :
Ripple adder
2 Wide every Full Adder
14x8x6
total blocks : 672 with air blocks
Some pics:
![[Image: 3x2HRWb.png]](http://i.imgur.com/3x2HRWb.png)
![[Image: yB2JuLy.png]](http://i.imgur.com/yB2JuLy.png)
![[Image: QepIu8U.png]](http://i.imgur.com/QepIu8U.png)
Regards Bram
RE: 4 BIT 2 Wide Full Adder - CMOSprinkles - 07-07-2013
There just isn't a whole lot of demand for regular ripple carry adders, since they are far slower than CLA adders and slower still than instant-carry using multiplexers. Could you modify it to support instant-carry? And how many ticks does it take to output sum and carry?
RE: 4 BIT 2 Wide Full Adder - JeremyG - 07-08-2013
Huge in my opinion, but that's just because I have a 2x8x5 one
RE: 4 BIT 2 Wide Full Adder - bametje12 - 07-08-2013
hello
Thanks for the reply's
(07-07-2013, 08:03 PM)CMOSprinkles Wrote: There just isn't a whole lot of demand for regular ripple carry adders, since they are far slower than CLA adders and slower still than instant-carry using multiplexers. Could you modify it to support instant-carry? And how many ticks does it take to output sum and carry?
i takes 4 ticks to output sum and with carry it takes 3 ticks. sorry but i dont know what support instant carry adder's are
(07-08-2013, 12:15 AM)JeremyG Wrote: Huge in my opinion, but that's just because I have a 2x8x5 one
How the hell did you do that ;D
Regards Bram
RE: 4 BIT 2 Wide Full Adder - JeremyG - 07-08-2013
(07-08-2013, 01:43 PM)bametje12 Wrote:(07-08-2013, 12:15 AM)JeremyG Wrote: Huge in my opinion, but that's just because I have a 2x8x5 one
How the hell did you do that ;D
Regards Bram
Remind me to show it to you when I'm on :3
RE: 4 BIT 2 Wide Full Adder - CMOSprinkles - 07-24-2013
Hello bametje12, any chance you've been working on some new adder designs? CLE adders are really cool.
RE: 4 BIT 2 Wide Full Adder - Billman555555 - 07-24-2013
You guys should look at PLA adders as they are not as complex
But as fast as CLE adders,
* Billman555555 needs to choose CLE, PLA or instant
RE: 4 BIT 2 Wide Full Adder - CMOSprinkles - 07-24-2013
Have you ever actually seen a Programmable Logic Array Adder implemented in minecraft? Please send me a link to the thread.
RE: 4 BIT 2 Wide Full Adder - Billman555555 - 07-24-2013
(07-24-2013, 07:41 AM)CMOSprinkles Wrote: Have you ever actually seen a Programmable Logic Array Adder implemented in minecraft? Please send me a link to the thread.
No proper look ahead adders.
RE: 4 BIT 2 Wide Full Adder - CMOSprinkles - 07-24-2013
PLA adder stands for 'Programmable Logic Array Adder" in digital circuitry. There is no such thing as 'Proper Look Ahead' unless it is a concept that was just recently invented. Link the thread please.
RE: 4 BIT 2 Wide Full Adder - redstonewarrior - 07-24-2013
(07-24-2013, 06:33 AM)Billman555555 Wrote: ... should look at PLACLA* adders as...Also, using PLAs for addition... der god. Well... Minus the extra circuitry, it's perfect speed XD
RE: 4 BIT 2 Wide Full Adder - CMOSprinkles - 07-24-2013
CLA makes more sense, but I hardly see how a CLA would be made faster and simpler than a CLE. The best Kogge-Stone CLA adder that I have seen in Minecraft was absolutely huge and still took 8 ticks for 8 bits, which I believe was the theoretical 'best-case-scenario'. As far as other implementations of CLA's in Minecraft, LucASS95 claims to have made a 9 tick Ladner Fischer CLA, but I have no idea how big it is. Point being though, CLE adders are about 5 ticks in the 'worst-case-scenario' with no piston derpiness to reset, so the possible throughput is excellent. Until I see a 2 tick Instant Carry adder that has a 3.5 tick throughput (still worse than a typical CLE's 3 tick throughput), I'd say that CLE's are the best adders in Minecraft at the moment.
RE: 4 BIT 2 Wide Full Adder - Billman555555 - 07-25-2013
PLA in MC is technically proper look ahead , look at propers video on it
RE: 4 BIT 2 Wide Full Adder - CMOSprinkles - 07-26-2013
I'm not interested in Proper's video on CLA's, I actually don't like listening to his videos in general. Even though it is in minecraft, the concept has already been very well developed and is known as "Carry Look-Ahead", so that is what we shall call it. I suppose you can call it what you like. Anyways, back on topic, any news on the speed of that 1 wide redstonewarrior?
(07-26-2013, 07:50 AM)CMOSprinkles Wrote: Anyways, back on topic, any news on the speed of that 1 wide redstonewarrior?
Haha, back to the topic at hand, that isn't at hand... I thought I was in a different thread. Anyways, got any new adders bametje12?
RE: 4 BIT 2 Wide Full Adder - Billman555555 - 07-29-2013
Yea bam. ^^^