Re: First PCB

On Wed, 15 Feb 2006 17:01:34 -0800, Noway2 wrote:
samIam wrote:
Actually, I've tested it at around 50 layers. It *defaults* to 8
layers when you build it though. You do run out of layer colors
pretty quickly though.

And here I thought 8 layers was OVERKILL. Who the hell makes 50 layer
boards ... jeesh

No hobbyist needs more than two layers and 640k of DOS RAM ;)

Where I work, it was a big deal when I created the first multi layer
(more than two) board. I think my boss would have a stroke if I
suggested an 8 layer board.

I have actually be curious as to how many layers it takes to route a
mother board that uses on of the Intel P4-D chips that come in a 780
pin PGA.

Any guesses?

I can't even imagine what all of those pins could possibly be _for_.

You've got, say, 64 bits of address, and 64 bits of data, read, write,
and IO/Memory. And maybe interrupts. That's like, 150 pins. And only
if you have a 64-bit wide address and data bus both!

Any explanations? ;-)

Thanks!
Rich


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Relevant Pages

  • Re: Fetch One Byte Is A Big Mistake
    ... for a 1024-bit data bus /external/ from the CPU, ... that requires 1024 additional pins on the CPU itself. ... but i doubt it's anywhere near the 20+ layers ...
    (comp.lang.asm.x86)
  • Re: Fetch One Byte Is A Big Mistake
    ... > that requires 1024 additional pins on the CPU itself. ... > it's simply not feasible with the current state of the industry. ... > which are so expensive not because of their data bus but for the L2 and ... but i doubt it's anywhere near the 20+ layers ...
    (comp.lang.asm.x86)
  • Re: How do I assemble large quilts?
    ... > how to assemble the three layers to obtain a smooth product. ... and finer density of pins until they're only a few inches apart. ...
    (rec.crafts.textiles.quilting)
  • Re: How do I assemble large quilts?
    ... but should we assume everybody knows to use safety pins? ... (If you can't find or don't like the curved pins, ... make sure the backing is smooth but *not stretched*. ... >> how to assemble the three layers to obtain a smooth product. ...
    (rec.crafts.textiles.quilting)
  • Re: First PCB
    ... And here I thought 8 layers was OVERKILL. ... I can't even imagine what all of those pins could possibly be _for_. ... if you have a 64-bit wide address and data bus both! ...
    (sci.electronics.design)