this is an important issue - hanging inputs etc., and the ERC rule
proposed would not be a bad thing, but what I have generally done is to
always place ALL the parts of a multi part comp in a corner of the
schematic somewhere while fetching the FIRST one
this makes you deal with them eventually and the ERC mostly picks them
up if left unconnected
nevertheless, these are some good ideas of Ian's but I worry about the
complexity of specifying all the wishes
off this topic...
don't you think it's really a pain the way the left pane (explorer)
opens up a file at the slightest touch, but the files in the right pane
need a firm dbl click?
you should be able to rename or delete (or whatever) a file in either
pane, but in the left pane you can't because you INADVERTENTLY opened it
up by selecting it
Dennis Saputelli
Ian Wilson wrote:
>
> 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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www.integratedcontrolsinc.com Integrated Controls, Inc.
tel: 415-647-0480 2851 21st Street
fax: 415-647-3003 San Francisco, CA 94110
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