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| 01:30.27 | kristianpaul | :o http://sdrgps.blogspot.com.co/2016/04/paul-breed-rocket-flight-test-data-2.html |
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| 03:55.33 | DocScrutinizer05 | http://sdrgps.blogspot.de/search/label/gnss-sdr hmm |
| 03:56.24 | DocScrutinizer05 | not bad, but the COCOM isn't spoiling stuff there even for the BRB(?) gps |
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| 19:13.10 | planasb | I have 32 bit ripple two numbers adder. I need to add 32bit number with constant (say 4). How to do it not using full 32 bit adder chain? |
| 19:21.43 | DocScrutinizer05 | tell me if you find a solution |
| 19:24.18 | planasb | Design an incrementer circuit for adding 4 to the PC instead of using a regular 2-input adder. This is easy to do -- just think about an adder where the second input is the constant 4 (i.e., all but one of the input bits is zero!) and then eliminate/simplify the adder logic appropriately. This optimization will also help with speed. |
| 19:24.45 | planasb | ahh, yes i need full 32 bit chain.. ! |
| 19:25.14 | whitequark | thats homework |
| 19:25.23 | whitequark | you should do your homework yourself |
| 19:25.41 | planasb | i now know how to do it |
| 19:26.29 | planasb | i need use constants (like zero) .. and not FA |
| 19:28.03 | wpwrak | the most efficient solution is obviously to use a 30 x 1 G ROM. an adder is such a waste of gates. |
| 19:28.36 | wpwrak | 32 x 4 G for non-standard arithmetic |
| 19:30.56 | whitequark | one could perhaps use Peano numbers in hardware to implement this |
| 19:31.15 | whitequark | adding becomes really easy and efficient. |
| 19:31.49 | whitequark | actually, I do wonder how a 2**32 cycle long delay loop would fare |
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| 19:36.11 | DocScrutinizer05 | wpwrak: I already pondered to suggest a LUT, but... Wasn't aware it's already Friday ;-) |
| 19:37.09 | wpwrak | friday, the weekend is beckoning, no time to waste - so we have to pick solutions that are simple and guaranteed to work |
| 19:37.11 | DocScrutinizer05 | now!!! use fuzzy logic ;-) |
| 19:37.29 | DocScrutinizer05 | or an analog calculator |
| 19:38.04 | DocScrutinizer05 | adding 4 is simply done by some passive components then, |
| 19:38.30 | DocScrutinizer05 | D/A->Zener->A/D ;-P |
| 19:39.20 | wpwrak | another option is to add an "output valid" signal, then a suitably configured 32:1 LUT. VALID only is high when the result is ready. else, you have to wait. |
| 19:40.38 | DocScrutinizer05 | btw, where was the definition of the base system? even if we use a discrete numbers system at all? use an analog system then adding 4 is extremely simple and with sufficient cooling you easily reach a valid value range that fits the requirement of "32bit precision" |
| 19:41.53 | DocScrutinizer05 | https://en.wikipedia.org/wiki/Analog_computer |
| 19:46.19 | larsc | if you only want to iterate through a list of number, but don't care about the order you can also use a lfsr |
| 19:50.15 | wpwrak | DocScrutinizer05: actually, he never said how accurate the result has to be. if we add a little bit of tolerance, say +/- 1 MSB, it gets a lot easier. and you can readily half the error interval. |
| 19:50.30 | wpwrak | or, rather, halve |
| 19:51.21 | DocScrutinizer05 | :nod: |
| 19:51.39 | DocScrutinizer05 | the approach with a counter instead a full adder is nifty though |
| 19:52.23 | DocScrutinizer05 | not fast, but nifty |
| 19:53.05 | DocScrutinizer05 | I'd grant full point rating at that solution |
| 20:02.18 | planasb | http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/ietron/fulladd6.gif << just reduce this logic if B is 0 |
| 20:02.27 | planasb | I winner |
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| 20:19.15 | whitequark | I think it's even simpler |
| 20:19.39 | whitequark | if you're adding 4, you don't need the *32-bit* adder chain, you can do with a 30-bit |
| 20:21.05 | whitequark | admittedly a literal reading of requirements |
| 20:27.11 | planasb | yes |
| 20:31.14 | DocScrutinizer05 | huh? |
| 20:31.44 | DocScrutinizer05 | silly riddles time? |
| 20:31.59 | planasb | yup |
| 20:32.05 | DocScrutinizer05 | meh |
| 20:32.21 | planasb | which adder you recommend ? |
| 20:32.29 | planasb | i need 32 bit picture of it :P |
| 20:33.13 | DocScrutinizer05 | obviously I don't recommend anything since I feel bored about that |
| 20:34.14 | planasb | DocScrutinizer05: it's friday, take long drink |
| 20:35.04 | DocScrutinizer05 | here it's snolfday |
| 20:35.36 | DocScrutinizer05 | and on snolfdays no longdrinks before 87:376 |
| 20:36.36 | DocScrutinizer05 | btw this doesn't sound like riddlers but actually like homework |
| 20:36.49 | planasb | homework |
| 20:36.55 | planasb | but i found answear |
| 20:36.59 | planasb | self |
| 20:37.06 | DocScrutinizer05 | ~ask |
| 20:37.06 | infobot | Questions in the channel should be specific, informative, complete, concise, and on-topic. Don't ask if you can ask a question first. Don't ask if a person is there; just ask what you intended to ask them. Better questions more frequently yield better answers. We are all here voluntarily or against our will. |
| 20:37.14 | DocScrutinizer05 | ~question |
| 20:37.14 | infobot | question is, like, If you have a question and want people to give useful answers, make sure you have read this first: http://www.catb.org/~esr/faqs/smart-questions.html |
| 20:37.29 | planasb | ok |
| 20:38.10 | DocScrutinizer05 | http://www.catb.org/~esr/faqs/smart-questions.html#idm45835691819312 |
| 20:38.43 | DocScrutinizer05 | http://www.catb.org/~esr/faqs/smart-questions.html#homework even |
| 20:39.36 | planasb | ok |
| 20:53.56 | whitequark | \ |
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