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route lengthening
SOLIDWORKS Forums
28 days ago

Hi

As a new user to SW PCB I'm still getting used to where the tools are hidden.

How do I interactively lengthen a route using a trombone shape trace?

Thanks.


Categories: SOLIDWORKS PCB

Comments
Last comment By: Timoteo García Bertoa   Thu, 21 Sep 2017 10:41:45 GMT
Re: route lengthening

Hello Graeme,

Launch the Interactive Route command from Route. The cursor will change to Cross hair, click to start the route from the pad and press the Shift+A.

Adding accordions,provides a dynamic means of optimizing and controlling net length by allowing variable amplitude wave patterns to be inserted according to the available space, and obstacles in your design. Press the Tab key to access the properties dialog while Adding accordions.

The length tuning offers 3 approaches for specifying the target length. The length can be:

  • Manually defined
  • Based on a net that has already been routed
  • Defined by design rules

To choose which of these methods is being used, press Tab during length tuning to open the Interactive Tuning Length dialog. The bottom of the dialog includes options that define the shape and dimensions of the tuning pattern, these can be controlled using the shortcuts detailed below. Options for selecting from the three Target Length modes are at the top of the dialog.

Manual: The manual mode is exactly that, you enter the length in the Target Length field. The list on the right keeps track of the values you have typed in, in case you want to use one again.

From Net: After selecting From Net you can choose a net from the list on the right. The length of this net will become the target, but it will be overridden if there are more restrictive design rules defined - we'll look more closely at the rules in a minute.

From Rules: You need to have one or both of the Length and Matched Length design rules defined to use this mode.SW PCB will then obey the most stringent combination of these rules.

There are 2 key ingredients to mastering the length tuning tool: knowing the shortcuts, and understanding the Net Length Indicator display. Let's start with the shortcuts available during length tuning:

Shortcut

Function

 

 

, (comma)

Decrease tuning amplitude

. (fullstop

Increase tuning amplitude

3

Decrease tuning pitch

4

Increase tuning pitch

1

Decrease corner miter

2

Increase corner miter

Y

Toggle starting direction

Tab

Open the Interactive Length Tuning dialog

USING THE NET LENGTH INDICATOR

Whenever you are adding tuning segments with the length tuning tool, the Net Length Indicator displays. Use the Shift+G the Net Length Indicator provides a visual gauge of how closely the current route length matches the required length.
The indicator consists of a white box, 2 vertical yellow bars, and a vertical green bar. Within the white box a colored slider will appear, indicating the current length of the net, with the exact length displayed in text on top of the slider.

Hope this helps!

Injy

By: Injy Gadalla  Fri, 13 Jan 2017 20:28:01 GMT
Re: route lengthening

That's great, thanks. I've nearly got the hang of it.

When my accordion/trombone has been placed, can I re-position it or adjust its size?

By: Graeme Parker  Fri, 13 Jan 2017 22:21:48 GMT
Re: route lengthening

Hello Graeme,

Yes you can, it is just a trace and you can double click on it to access its properties dialog.

Injy

By: Injy Gadalla  Fri, 13 Jan 2017 23:36:39 GMT
Re: route lengthening

Thanks Injy.

The problem is, when I place the accordion and try to move it as a whole, some of the vertices stay put and thus the accordion deforms.

If I double click to get properties, all I get is the property of one of the track segments that are part of the accordion. I don't see how, after this item has been placed, I can adjust its size (as a whole entity, not a single track).

Is there a video that you know of that shows this in practice?

I'm from a Zuken Cadstar background (a small player in PCB CAD) and track lengthening is very different. Here, you select an existing track and add the accordion. The accordion has resize boxes and is treated as a single entity unless you want to decompose it into individual traces. The amplitude, spacing and shape are easy to adjust simply by dragging the relevant adjustment point.

See here (start at 55s): A few of the routing tools available in CADSTAR - YouTube

 

Supplementary question: is lengthening available for differential pairs? When I try to route a diff pair, then shift-A does not seem to work.

By: Graeme Parker  Sat, 14 Jan 2017 08:45:04 GMT
Re: route lengthening

Hello Graeme,

 

From the home menu, under the Select command, you have the option to select connected copper.  This option will allow you to select all routed tracks and electrical objects connected to the same net.  Once it is selected you can edit the properties as a whole using the PCB Inspector panel. In the Inspector click the all types of objects to just limit the edit the tracks. Once you edit a field the changes will propagate to all selected track objects.

 

 

 

Hope this helps

 

Injy

By: Injy Gadalla  Thu, 19 Jan 2017 18:19:13 GMT
Re: route lengthening

Hi,

 

Where do you define the length rule?

 

BR
Markus

By: Markus Olsson  Fri, 21 Apr 2017 09:28:02 GMT
Re: route lengthening

Hi,

You can define the lenght rule on the Home menu, on Design Rules icon

You can find a lot of different rules : 

Regards,

Carole

By: Carole Jacquinot  Wed, 03 May 2017 08:56:00 GMT
Re: route lengthening

Hi Carole,

 

Thank you for your answer and screenshots, but I can't find any rule that has to do with length in there!

 

Best Regards

Markus

By: Markus Olsson  Thu, 04 May 2017 07:24:41 GMT
Re: route lengthening

Hi,

I'm sorry, I think that I don't really understand what do you mean about lenght,

Could you explain with a scheme perhaps?

 

Regards,

Carole

By: Carole Jacquinot  Thu, 04 May 2017 07:37:38 GMT
Re: route lengthening

Hi,

 

If you look above at the screenshot you can see an option where it says, Manual, From Net or From Rules. I am curious about "From Rules" and where is the rule?

By: Markus Olsson  Thu, 04 May 2017 07:40:15 GMT
Re: route lengthening

Oh,

In fact, this rule is accessing like Injy said :

-when you Route with Interactive routing

-You click on Shift+A to put the route as trombone shape

-And then you click on Tab to open the interactive lenght tuning

 

And it seems that the length on the route depends on the Routing Topology rule (Routing Topology | Online Documentation for Altium Products ), and in function of the application use the Net Antennae rule

 

I hope that I answer to your question

 

Regards,

Carole

By: Carole Jacquinot  Thu, 04 May 2017 08:28:40 GMT
Re: route lengthening

Hi,

 

All this is true for a single track, but Interactive Length Tuning doesn't appear when you work with Differential Pair Routing.

This is what Graeme and I are interested in, and please we want to know if this feature is not available in Solidworks PCB.

 

To clarify:

A differential pair. Route -> Differential Pair Routing -> Click on one of the tracks. -> Shift + A doesn't do anything. Tab opens the Interactive Routing window, which doesn't provide what we are asking for.

A single track. Route -> Interactive Routing -> Click on one track -> Shift + A works, an accordion shape appears. Tab opens Interactive Length Tuning.

 

If you apply the second thing to a single track of a differential pair, it doesn't work either.


Regards.

Timoteo

By: Timoteo García Bertoa  Thu, 21 Sep 2017 10:41:45 GMT
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