[PCB_FORUM] Re: Instance property in Capture CIS
- From: "Chris Brennan" <Chris.Brennan@xxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Wed, 6 Apr 2005 08:59:21 -0400
Use Accessories -> Transfer Occ. Prop. To Instance -> Push Occ. Prop.
Into Instance.
CJB
Chris Brennan, C.I.D.
PCB Designer
Fidus Systems Inc.
chris.brennan@xxxxxxxx
Tel (613) 828 0063 x322
Fax (613) 828-3113
-----Original Message-----
From: Naren [mailto:naren@xxxxxxxxxx]
Sent: Wednesday, April 06, 2005 12:23 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Instance property in Capture CIS
Hello Mr Drew
Can I make same instans & occurance propertie same with
one command ?
If so then what is the command for it (If anyone knows it)!!
Drew said:
>
> Hello,
>
> I have one little alteration to what David posted. As soon as the
> part is first placed, the schematic has both an instance and an
> occurrence whether the schematic is flat or not. See Capture's online
> help for "instances and occurrences". It is neither extremely simple
> nor anywhere near as complicated as pre v7.2 definitions made it seem.
>
> Expanding on David's post...
> The way I see it is; if a part is *exactly* the same (REFDES does not
> count) and I have two or more of that part, I have one instance and
> two or more occurrences. If I select a part in the schematic, edit a
> property of that part and update only the "current" part, I have
> created another instance. *** The design cache will show this.
> Different properties for the same part will create more instances.
> More than one instance of what I thought was the same part is
> noticeable when I create a BOM. Ah,.. some of them are 0402s and some
> of them are 402s. Or, some of them are 1uF and some of them are
> 1.0uF.
> ***After rereading the help file, I am not sure if Capture thinks the
> same way I do.***
>
> Pin swapping would not alter the occurrence or add an instance. Yes,
> graphically the part will be different but the properties of a part
> cannot change with a back-annotation by pin-swap file only.
> Capture's use of instance and occurrence has always caused me some
> confusion. I have always selected the default and never looked back.
>
> Cheers!
> Drew
>
>
> ----- Original Message -----
> From: "David Greig" <david@xxxxxxxxxxxxxx>
> To: <icu-pcb-forum@xxxxxxxxxxxxx>
> Sent: Tuesday, April 05, 2005 6:55 AM
> Subject: [PCB_FORUM] Re: Instance property in Capture CIS
>
>
>
> If you had a flat schematic - no hierarchy then you would only have
> instances. Pspice is flat (and not particularly Berkley!). PCB type
> schematics can be hierarchical.
>
> Occurrences are the different repetitions of the original instance
> when a
> hierarchy block is repeated.
>
> That's the basic idea, instances are the white properties, the dashed
> bits
> are properties inherited from the library and unchanged, yellow bits
> are the
> occurrence properties and non-dashed have been changed either directly
> or
> via backanno etc.
>
> That's the basic idea, but we are talking Orcad_speak so don't take it
> too
> literally!
>
> Surprisingly pin-swapping a flat file does not generate occurrences
> even
> although the symbols pins get shifted. Guess that just a changed cache
> symbol.
>
> Best Regards
>
> David Greig
> ______________________________
> GigaDyne Ltd
> Buchan House
> Carnegie Campus
> Dunfermline KY11 8PL
> United Kingdom
> t: +44 (0)1383 624 975
> ______________________________
>
> -----Original Message-----
> From: Naren [mailto:naren@xxxxxxxxxx]
> Sent: 2005-April-05 14:24
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] Instance property in Capture CIS
>
> Hi all
>
> I am using Cadence 15.2 PCB package. For schematic purpose I am using
> Capture CIS.
>
> My question is what is instance & occurance property of the components
> ?
> Can we change with one command (If any) If both are differ.
>
>
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--
"Keep looking foreward"
Regards
Naren Thesia
Member CAD
D'GIPRO SYSTEMS PVT. LTD. BANGALORE
TEL: 080-25219017/18 (O)
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