> ok.. I have a complex schematic and I want to do auto route.
> I start the auto route and the process begin
> the final result are too many unrouted tracks..
> my question is:
> how I start a new auto route? playing with options/parameters don't give
any
> better results
> deleting the board and start new board auto route force me to place the
> component in place again.
> what  can I do to start auto route without all this mess?
> what are the differences in the direction signs? "/ \ * . |"
> if someone can explain in details I'll appreciate it.

To delete an existing route, use RIPUP ALL.  Autorouting in general is a
complicated subject, and the Eagle manual contains a reasonable bit of
information on it.  You really do need to read the manual.  The autorouter
is not intended to be an "idiot proof" feature.

If you have too many unroutable traces, then you may need to reduce the
track width closer to the PC house limit and make the routing grid finer.
However, you can only throw so much brute force at it before the results
will taper off.  In the end a good layout is the most important single
factor.  If you've done all the right things and it's still not routable,
then consider adding a layer or two (For example, there is no point to a 3
layer board.  The board house will probably use a 4 layer process and charge
you accordingly anyway.).

So far I've been quite impressed by the Eagle autorouter.  I've gotten it to
100% route all my boards, although I had to be an active participant,
especially on the a couple of the tougher ones.  I also use a lot more
optimization passes with parameters varying from pass to pass.  Although
this has nothing to do with the routability (this is determined in the first
pass), it can make a large difference in the number of vias.  On a recent
board, the first pass created over 1000 vias although the final route ended
up using only 170.  You won't get these kind of results using the Eagle
defaults.


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