At 03:42 PM 9/29/98 -0400, JoAnn Amerson wrote:
>I want to know which one of you designing gurus out there are going to be the
>one to design that implant that's used on shoddy designers?  The one that
>gives them a "zap-a-roony" for turning in a design chock for of DRC errors.
>Would you let me know when it's commercially available?  And can you make
>one that can be inserted in a supervisor who allows said design to slide
>because "it works"?  Can I get a discount for buying multiple units?

Get me a purchase order, we'll design the PCB.... :-)

Two thoughts:

One is that sometimes the exigencies of a project make it necessary to put
a board into production even when the schematic or PCB generate lots of
"errors" or "warnings." If "it works."

The other thought is that this should never be done unless it is truly an
emergency. It makes more work for everyone later on.

A schematic or board that generates dozens or hundreds of DRC errors and
warnings (I just got a schematic from a customer that generated about 150)
may well have a few real errors buried amidst all those. One can take the
time to track down each one of them and verify that it is only a formal
error, not a "real" one, but next time changes are made to this schematic
or PCB, those errors and warnings will pop up again. It is far superior, if
the time is available, to fix them so that one gets the blessed "no errors
or warnings" message.... And perhaps so that the next schematic.

So it is generally worth the time to identify why the errors and warnings
are popping up, and fix it. Maybe the DRC rules need to be modified. Maybe
schematic library parts need to have pin attributes changed. Whatever, it
is worth the effort.

Another application for that zapper:

The engineer sends me one of those schematics full of errors. I fix them
and send the schematic back to him, telling him about the corrections. He
says, "fine," and I go ahead and design the board. Then he says, "Oh, I
have some changes, quite a few of them." And the new schematic he sends me
was made from the error-laden version, not the corrected version I returned
to him.

[log in to unmask]
Abdulrahman Lomax
P.O. Box 423
Sonoma, CA 95476

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