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Maximum Package Height

BuddSw

I am using Allegro PCB Editor 16.3.  Although I have used this product for a while I've never needed to add Maximum Package Height as something to flag using DRC.  I've looked in the documentation and the only constraint-setting information I can find is for spacing/width/pairing type stuff.  Where can I find the documentation to set up maximum height constraints?  I know I can manually check each package on the board for it's Max Height property that is far from ideal.

 I will be grateful for any insight that can be given.

 

Budd S.

  • Your part needs to have a Package Boundary, on Package Geometry / Place Bound Top, Setup>Areas>Package Boundary, then use Setup>Areas>Package Height, select the Package Boundary and assign the Maximum Height in the Options tab. Right-click>Done to finish. (Also see algrolibdev.pdf in the doc\algrolibdev directory of the installation, page 42 for Defining Symbol Heights)

  • Thank you.  All of the parts I have created have the package boundry defined and the Max Height property attached.  What I don't know how to do is to set up the .brd file to have areas where I specify the maximum allowable height of a component for that area.  For instance, I have an area where the component height can't be more than 200 mils.  I have components in my design that are up to 620 mils in height.  I'm looking for how to have accidentally placed components that exceed 200 mils in the restricted area trigger a DRC error.  Is that possible?  It would seem so if we are putting Max Height properties into the footprints.+

  • In the board drawing add a PACKAGE_KEEPOUT shape (top or bottom) and add the properties PACKAGE_HEIGHT_MAX and or PACKAGE_HEIGHT_MIN to define the keepout checking height(s).

    Cadence ONline Support solution 11612438 describes various scenarios and has a board file attached which shows how the keepout and it's heights are used.

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11612438;searchHash=1c6ce5a55c44a3897e80651150ffacc6

  •  I have done this, but I am always getting DRC errors for PACKAGE_HEIGHT_MIN even though I have not set a property in the keepout region for this.

  • OK, for a keepout, Package_Height_Min is going to be 0 if you don't specify a value, that's going to be the board surface, so any parts placed within the boundary of that shape will cause a DRC. You increase the Package_Height_Min property of a Package Keepout to raise it off the board surface to allow parts with a height of less than, or equal to, the Package_Height_Min to be placed there without a DRC, parts with Package_Height_Max of greater than the Package_Height_Min of the Keepout will generate a DRC.

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