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C-Horse
USA
4 Posts |
 Posted - 19 Jun 2009 : 05:44:43
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I have questions on cross-sheet connections. I'm assuming the FROM / TO schematic symbols can be used to "virtually" connect pins from componets, either on the same sheet or accross sheets. I've tried using FROM/TO but I'm not sure how to get them to "link up". There doesn't seem to be anything in the manuals on their use.
Any insight would be greatly appreciated.
-- Fred
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olga
United Kingdom
107 Posts |
Posted - 19 Jun 2009 : 09:43:42
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Make the nets the same on the two places you're trying to connect; that will link them.
If you have the paper manual for V11, page 103 Cross Sheet References is relevant. This states:
"cross sheet signal references are cosmetic... it is the net name that carries the significance, not the symbol."
HTH!
Best wishes,
Olga. |
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C-Horse
USA
4 Posts |
Posted - 19 Jun 2009 : 19:28:19
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| Thanks Olga. |
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C-Horse
USA
4 Posts |
Posted - 19 Jun 2009 : 23:17:44
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It works fine on the same sheet but when I try to do it accross sheets it doesn't work. Upon examining the net list file, I find that it adds the name of the schematic sheet to the net name. For example N0008!Display! So when I add a pin on schematic "processors" to N0008 it adds to to N0008!Processors! whic is a different net than N0008!Display! so they don't connect. How do I change this behavior? I've looked in the manual (I'm running V12) but can't seem to find it.
Thanks in advance for your help.
-- Fred
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C-Horse
USA
4 Posts |
Posted - 20 Jun 2009 : 00:04:49
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OK, it looks like if I give it a unique name myself (DISP_4 tor example) it doesn't add the sheet name suffix and it connects accross sheets. If someone has better way, I'm all ears... err... eyes... whatever.
Thanks again.
-- Fred
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Edited by - C-Horse on 20 Jun 2009 00:05:21 |
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Peter Johnson
United Kingdom
498 Posts |
Posted - 06 Jul 2009 : 13:21:53
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No, it was designed that way. Numbered nets stay local to the individual project sheets, but when they're renamed to a different format, they become global.
If you look at [Settings], [Design Technology], and look on the 'Nets' tab, anything which is still visible when 'Auto Numbered Nets' is unchecked will be global. |
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shadders
United Kingdom
224 Posts |
Posted - 08 Nov 2009 : 21:58:23
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Hi,
I am looking to use multiple schematics, and the manual indicates that Cross Sheet references can be used, and the text above states that the name must be somthing other than the provided Net name to ensure that the name is global.
The picture in the manual shows a thin rectangle with one pointed end, but i am unable to find this symbol in the libraries.
Has this symbol been updated to the FROM/TO symbol pair ?.
Is the symbol pair required - can i use two (2) FROM symbols to connect across sheets ?.
Thanks.
Regards,
Richard. |
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Peter Johnson
United Kingdom
498 Posts |
Posted - 16 Nov 2009 : 11:38:10
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Sorry for the slow response Richard. Someone was cheating with the picture - it's a Pulsonix symbol. However, it's fairly trivial to create one like it for yourself.
As they're only labels, and purely cosmetic, it's entirely up to you how you use them. If the symbol origin is coincident with the connection point, you could even edit the preferences and put them at funny angles for intra sheet links. The connection point will stay on grid. |
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shadders
United Kingdom
224 Posts |
Posted - 16 Nov 2009 : 21:42:53
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Hi Peter,
Thanks - was looking for the symbol and could not find. Will create my own in future, but use the existing to progresss my design. Thanks again.
Regards,
Richard. |
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shadders
United Kingdom
224 Posts |
Posted - 03 Jan 2010 : 19:42:08
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Hi,
Just a quick check on the exact requirements for cross sheet references :
1. To connect Nets between sheets you have to change the Net Name to be the same for both sheets.
2. The cross sheet reference symbol is cosmetic only.
The problem with item 2 is that when i set a To symbol to "CDCEDP" on one sheet and set a From reference to "CDCEDP" the system throws an error and states that this component name is already in use.
Why is this - why have a To and From symbol on different sheets that must have different names if they are cosmetic ?.
If it is cosmetic only, then why not have the same name since this assists reading the schematic diagrams easier. (i currently have 6 schematics for one project).
If you have to rename the nets individually across all sheets, then the To and From symbols which will all have different names seems to be superfluous.
Hence you have to complete the following :
1. Rename all nets to be connected.
2. Create a name for the To symbol.
3. Create a different name for the From symbol - which then defeats the visual link of cross schematic connections.
Am i missing something here on the use of To and From symbols and net names ?. Thanks.
Regards,
Richard. |
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Iain Wilkie
United Kingdom
1015 Posts |
Posted - 04 Jan 2010 : 09:54:46
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I never use to and from symbols..... any signal that goes off sheet is simply given a net name to identify it. You can then use that net name on any other sheet/s. If you want to use to/from I would simply add a text label next to the net name which would describe the source/destination.
Iain |
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shadders
United Kingdom
224 Posts |
Posted - 04 Jan 2010 : 11:22:46
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Hi Iain,
Thanks for the reply.
Since i have a microprocessor in the design it was more tidy to create a separate sheet for this requirement. Hence the use of To and From connectors is important for terminating the net - else the DRC would throw errors.
It seems that there is extra work to add the To/From connection, and then add a name to display, and then change the net names to obtain the PCB connection when translated. No doubt other packages have this requirement too.
Would it be possible to associate a Net with the To/From connector as a function of that connector - as a new symbol type to save time ?.
Regards,
Richard. |
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Iain Wilkie
United Kingdom
1015 Posts |
Posted - 04 Jan 2010 : 11:48:19
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Hi Richard,
I am still a bit unsure why you need this requirement .... most of my work is over multiple schematics (16 in the current job) and all I do is give the net a name by simply right-clicking it and naming it and then settinf "display net name" and move this to the end point of the line. When you are working on other sheets that need to connect to that net you simply type it in or select it fro the net list. All in all it is no real "extra work". If you are trying to use page numbers etc in your to/from connections then I don't think there is a straightforward solution.
Iain |
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shadders
United Kingdom
224 Posts |
Posted - 04 Jan 2010 : 12:18:15
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Hi Iain,
Thanks for the reply.
OK - will use this in future - will save quite some time. The To/From connections make the schematic easier to read.
Do you leave the Nets dangling or do you also use the To/From connectors ?. Thanks.
Regards,
Richard. |
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Iain Wilkie
United Kingdom
1015 Posts |
Posted - 04 Jan 2010 : 12:29:08
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I just leave them dangling but put the "displayed net name" at the end of the connection.... I suppose you could create a termination symbol (not a component) and simple copy and paste it throughout the design to make it neater.
Iain
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shadders
United Kingdom
224 Posts |
Posted - 04 Jan 2010 : 12:52:39
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Hi Iain,
Thanks. I will ue the To/From to stop the DRC errors.
Regards,
Richard. |
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Topic |
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FROM / TO