Blaze DRE issues

[drmorgan]

I've attached a word doc showing documening problems I am having using Blaze Dynamic Route Editing...DRE

I'm wondering if anyone else is having similar problems? Does anyone know of a setup somewhere in Blaze that can help with angled routing?

Thanks

Derek

[John MacPhee]

I don't see your attachment and I presume that by DRE you mean the Blaze Interactive Router. The Interactive router is doing weird things to my diff pairs. And if I try to edit the weirdness by truncating the 90 degree angle, the router forgets I'm working with a diff pair and reroutes the net ignoring the diff pair rules.

[drmorgan]

I attached the file and I don't know why it didn't work??

I'll try this again,...The file is only 300k

[John MacPhee]

It is difficult to control the interactive routing. When I create a series of corners, for example, I expect them to stay put and then when I hit "complete" the router does its own thing.

As for my diff pair problema, if I start the route at the connector end instead of at the BGA end, and then hit "complete", the result is much better.

[Ryan Marston]

Is it ok to come out of a square or rectangle pad from the corner? I was always told that you should never come out there, but only perpendicular to the pad.

[randychase]

Originally posted by Ryan Marston
Is it ok to come out of a square or rectangle pad from the corner? I was always told that you should never come out there, but only perpendicular to the pad.

I would wonder what the logic of that would be? I can actually see an argument for it being better to come out of the corner than the side. It's an automatic filet so less chance of break out, and there is less etch entrapment. Coming out perpendicular is the same as a 90 degree trace bend as far as entrapment. Not that I worry about it.

[KCDesign]

I have had this happen to me before and what I found to fix it was going to a finer grid when connecting two traces.

[Skip Yutkus]

Randy,

Some companies have done soldering studies for SMT parts and there is at least one that I know of that forbids it designers from routing out of the corner of an SMT pad - I personally have always routed that way and never encountered any problems.

Skip

[DaveC]

Sorry about the late reply, but I just joined the forums and saw this thread.

When you finish a reroute with FIRE, double-clicking can lead to those odd entries that Derek showed. A cleaner way to finish reroutes is to CTRL+click the new end point. This basically does an End at that point, whereas double-clicking fires off an auto-complete, which can lead to those messy entries. When you do a CTRL+click on the same trace, it's smart enough to just finish the trace and ignore the End Via setting.

A general comment is that you should also look at the "Smooth traces on complete" setting (Tools/Options/Routing). You'll have more precise control over your edits with this off. Otherwise the system will run a Smooth pass on the trace when you reconnect it and may get rid of some corners that you put in.

HTH,
dave

[DaveC]

As for editing Diff Pairs, once the pairs are routed they are in most cases treated as individual nets. However, there is a "Smooth for Diff Pair" RMB command. To use it, you need to have both Traces of the pair selected, and you'll see the command on the RMB menu. This will run the Smooth process on both Traces, preserving the gap.

The important thing here is to select the entire Trace, and not the whole Pin Pair. In Blaze, the term "Trace" means all of the segments between 2 pins or vias, but not including the pins/vias. If you set your filter to Anything, select a segment, then RMB "Select Trace," you'll see what I mean. You can also set your Filter to do this. In the Filter toolbar, there's a "Traces" icons. Then towards the end of the toolbar (4th from the end) there's a "Segments and Corners" icon. If you turn that off, when you select a segment, you'll select the all of the segments in the Trace.