At 04:37 PM 5/10/01 +0100, [EMAIL PROTECTED] wrote:
>It is good practise to place "no ERC directives" on unused pins anyway,
>even if they are defined as "passive".
One more pixel should be added to this picture. Set up the error matrix so
that *all* unconnected pins generate a warning. It takes very little time
to put No-ERC directives on all unused pins, even if they are outputs, for
example, and it is entirely possible that an output can appear to be
connected while it is actually open. With the default error matrix, there
may be no warning in some error situations (for example, the intended
output pin is unconnected, there is a passive pin in the same net and
passive pins are set to green and/or there is also an input pin in the net.)
It is also highly recommended to take the time to produce a clean ERC. This
forces the engineer or support person to deliberately approve of every
situation that will otherwise produce a warning. If you *can't* find the
source of a warning, and you have carefully verified that the net list is
correct with respect to all involved parts, pins, and/or nets, and you need
to move on, then placing a No-ERC directive on the error marker may be
okay. It would still be better to find and fix the problem. It might also
be better to *not* place the directive, which will leave a warning that
something is bad to future users of the schematic. In any case, ERC markers
have no effect on netlisting.
I've encountered many engineers who can't take the time to find and fix all
the warnings; this is fine with me as long as either
(a) they are willing to pay someone to fix the problems (which may be
perfectly reasonable), or
(b) they don't mind getting back bad boards, at least occasionally, or
(c) they are willing to hand check every connection, with every revision.
[EMAIL PROTECTED]
Abdulrahman Lomax
P.O. Box 690
El Verano, CA 95433
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* To post a message: mailto:[EMAIL PROTECTED]
*
* To leave this list visit:
* http://www.techservinc.com/protelusers/subscrib.html
* - or email -
* mailto:[EMAIL PROTECTED]?body=leave%20proteledaforum
*
* Contact the list manager:
* mailto:[EMAIL PROTECTED]
*
* Browse or Search previous postings:
* http://www.mail-archive.com/[email protected]
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
