>
> Have fun! I find it relaxing (for easy stuff! The next 2 layouts are nightmares.
> For Maxim, I'm
> starting a 6 layer, 10 x 10 board at 100Mhz speeds. 5ns SRAMS and a 248-pin Xilinx
> part)
Not that I would want to do any of this myself, but one of the folks I worked with
(whom I found out worked with Paul eons ago, stealing all of their computer sim time
for antenna simulations) completed a 44 layer backplane. The board is .3" thick and
19" by 30" or so. The connectors aren't even soldered in, they are just "press fit"
but with ~1K pins each, they have enough surface to hold them in place just fine.
Needless to say that the cost for a single board could buy a whole lotta MOTM! Of
course, the cards with the 1500 pin ASICs that plug into the backplane are 22 layers
thick on their own! Stuff you just don't want to do at home. [Dear, could you
crank up the wave solder line and the electron microscope so I can put down a few
chips tonight?] Oh, and if you have to fix up some of the surface mount resistors
and capacitors by hand, I've been told it is like "soldering fly shit". OK, now you
might understand why I'm in the "assembled module minority"....
Eric
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