Stats

More Content

Loading PCB constraints into Capture

Sagetech

I have a PCB design with multiple constraints that were done in CM. Couldn't figure out why each time I loaded a new netlist from Capture that several of the constraints were changed. Realized that changes made in PCB CM are not loaded back into Capture.

Found the procedure in Capture to load them back which has me "sync" Capture with the board but that just carries the schematic constraints into the PCB again which is what I don't want. I want to go from PCB to Capture with the constraints.

In Capture, under PCB/Update Schematic it tells me that the two are not in "sync" and that I need to do "update layout" then "update schematic" but doing this changes the constraints in layout - which is what I don't want.

To summarize, how do I get the constraints, already defined in PCB Editor, into Capture?

Thanks, 

Tom

  • steve
    0

    You can generate a technology file from CM in PCB Editor (open CM and use File - Export - Technology File). Once you have the file, open CM in Capture and Import this. You can then use PCB - New Layout in Capture, choose your existing board for both board entries and import. Once complete you should be able to run the PCB - Update Schematic. Obviously make sure you have backup copies of board and schematic before you start. 

  • Sagetech
    0 in reply to steve

    Thanks Steve. I did as you suggested and it worked for all but one diff pair. That diff pair is defined in CM just like the others but the info was not backed into teh schematic during the update process for some reason. I made the change in the sch manually and I'm moving on. Thanks!

    Tom

Cadence Guidelines

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.