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Rehtorical question — Parallax Forums

Rehtorical question

AImanAIman Posts: 531
edited 2008-12-13 03:46 in Propeller 1
Since the Propeller has 8 cogs why doesn't it have 8 sides?

It would seem that isolating out each cog to a side would be helpful.

Comments

  • ElectricAyeElectricAye Posts: 4,561
    edited 2008-12-12 16:04
    Some days I'm certain my Propeller has a dark side.
  • BradCBradC Posts: 2,601
    edited 2008-12-12 16:05
    AIman said...
    Since the Propeller has 8 cogs why doesn't it have 8 sides?


    It would seem that isolating out each cog to a side would be helpful.

    How?

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    Cardinal Fang! Fetch the comfy chair.
  • sylvie369sylvie369 Posts: 1,622
    edited 2008-12-12 16:27
    That gives me a great idea - a wireless controlled self-rolling die, with a little cell phone vibrating motor inside. Do we have parts that are small enough yet?
  • PhilldapillPhilldapill Posts: 1,283
    edited 2008-12-12 17:03
    Can you eleaborate on why you think it would be useful? Are you talking about isolating out the pins? The "Cog" is more of an analogy than anything... it's not a real object...
  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2008-12-12 17:10
    Hmmm, in keeping an analogous them in terms of programming, an octahedral would seem a natural fit for the Propeller.· However even in a 2D octagon layout the chip performance would take a severe hit.· Due to process variations, cogs that are aligned·45 Deg or 90 Deg to other cogs would have enough process variance that they would not perform exactly the same from one cog to the next.· By stepping and repeating the layout,·each cog gets equal process variation alignment, so each cog performs relatively identical…. That’s why you end up with a square or rectangle.
    ·




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    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.

    Post Edited (Beau Schwabe (Parallax)) : 12/12/2008 5:16:30 PM GMT
  • Scott LewisScott Lewis Posts: 18
    edited 2008-12-13 00:44
    at least SOMEONE pays attention to prof. Heedly in CPE 151, if you went to sac state :P
  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2008-12-13 00:57
    Scott,

    lol - Part of my own crash course while working at National Semiconductor.· Plus I had a good mentor with roots from Harris Semiconductor.


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    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.

    Post Edited (Beau Schwabe (Parallax)) : 12/13/2008 1:02:25 AM GMT
  • AImanAIman Posts: 531
    edited 2008-12-13 02:49
    Makes sense. Brings to mind why car engines all have the same length between the carb and the cylinder.
  • Carl HayesCarl Hayes Posts: 841
    edited 2008-12-13 03:46
    AIman said...
    Makes sense. Brings to mind why car engines all have the same length between the carb and the cylinder.
    Almost no carbureted engines have equal-length runners, though.· I suppose many modern ones do, but it's not universal, nor even usual.

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    · -- Carl, nn5i@arrl.net
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