I'd like the options for (a) warning if there are unplaced parts, and (b) include
unplaced part pins as if placed (so the same rules would apply re unconnected inputs,
etc.).
I think the idea of an extended no-ERC marker has been discussed before, and I'd
definitely like that -- being able to suppress a specific error condition.
I don't want a full rules-based ERC -- I'm afraid the benefits wouldn't outweigh the
increased complexity of maintaining them.
-----Original Message-----
From: Ian Wilson [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, May 22, 2001 4:19 PM
I would like the Sch ERC process to be able to inspect the parts of a
multi-part component and warn if all parts are not placed. Especially so
that unplaced parts carrying inputs and power pins can be detected.
I think this would help overcome the situation where Protel uses hidden
power pins on each part of its multi-part (logic especially) parts in order
to ensure power is connected regardless of which or how many of the parts
are placed. There would be less tendency to use hidden pins as if desired
a separate power-only part can created and the user is safe in the
knowledge that they will be warned if this power part is not placed.
I think there should be an ERC option to warn of non-placed parts and an
another option to inspect unplaced parts for floating inputs and power pins.
Actually, I would like to see ERC become more elaborate - like the PCB
rules system. I would like a rules based ERC. Currently we can place a
no-erc directive when we have, for instance, two output pins shorted
together to prevent a warning. But this No-Erc directive blocks all ERC
testing on that pin. I would like to be able to, for instance, say that it
is OK for U2-pin3 to short to U4-pin11 but no-other outputs.
I am for a more elaborate rules based ERC with the ability to look into
unplaced parts of multi-part components.
Any comments?
Ian Wilson
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