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davekelly
United Kingdom
28 Posts |
 Posted - 20 Sep 2010 : 12:39:22
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I have been using the new V14 hierarchical design to split up a large circuit I am working on.
In it I have used a simple dual op-amp, but I cannot see a way of having the gates in different circuits. I don't want to have to place an extra IC on the board just because I can't draw it in the schematic.
Is there a workaround? |
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Iain Wilkie
United Kingdom
1015 Posts |
Posted - 20 Sep 2010 : 12:44:54
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I have not used the hierarchical feature, but I wonder if you can split components in the same way as you can on multiple schematic sheets.
Thats done like this .......
Right, heres how you do it.
Add your multi-gate component (U1) on sheet one and use what gates to want on that sheet. Any unused gates put them in the component bin. Now on sheet 2 add the same multi-gate component, it might be U2, select the properties of one of the gates and change its name to one of the spare gates in the component bin on sheet 1 (ie U1 gate c), the program will inform you that that gate is in the bin for sheet one and ask you if you want to use it here. Say yes and hey-presto thats it. You can obviously delete the remaining gates of U2.
Iain
Iain
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Edited by - Iain Wilkie on 20 Sep 2010 12:48:15 |
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davekelly
United Kingdom
28 Posts |
Posted - 20 Sep 2010 : 13:53:31
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Unfortunately it doesn't work like this.
The schematics are separate files, so you end up with a different component bin for each.
I tried to manually change the properties for the gate to use the same refdes as the other, but got a warning that the component is already in use on another sheet. |
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davep
United Kingdom
101 Posts |
Posted - 21 Sep 2010 : 00:13:58
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I have found the simplest way is to make sure each component is not split across sheets. I try to break the circuit into logical chunks with the least number of nets going from sheet to sheet.
This has worked (except where I forget the link the nets) on a large number of projects.
It does mean that nice features like having a connector split across sheets, and having all decoupling (with power gates) on one sheet can't be done.
It is also quite simple to break a circuit into parts when it gets too complex on one sheet.
I do not plan to use the heirarchy process as provided in 14.
I have allocated a 'block' sheet in the past and found that that works OK. |
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DavidM
United Kingdom
458 Posts |
Posted - 21 Sep 2010 : 08:53:52
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Regardless of whether your multi-sheet project uses the new hierarchy features or not, the process of splitting components across sheets is the same.
The procedure is documented in the Help file under "Splitting Components Across Schematic Designs".
With the benefit of hindsight we may well have kept all the sheets of a circuit in one design file. This would have helped with a few of the issues like splitting components across sheets, consistency of net classes, etc. But of course to get there from where we are now is probably not the best use of our resources.
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Iain Wilkie
United Kingdom
1015 Posts |
Posted - 21 Sep 2010 : 09:05:17
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Does that not mean that the description I gave should have worked ?
Iain
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davekelly
United Kingdom
28 Posts |
Posted - 21 Sep 2010 : 13:01:34
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Ok, thanks for the help.
It does work, but you get an error message when trying to close the properties dialog that ICx is already used in the design.
It sets it Ok afterwards though. |
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DavidM
United Kingdom
458 Posts |
Posted - 22 Sep 2010 : 09:06:39
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| I'll get someone to have a look at following that sequence and sorting out that message. If you are working through the expected procedure then I'd only expect perhaps a warning rather than an error. Perhaps we just need to alter the wording of the message a bit. |
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Topic |
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Hierarchical design, split component