I have defined an Anti Pad for the differential pairs of a high speed connector within the padstack for those pins. I have checked the box beside "Enable Antipads as Route Keepouts (ARK)" on the parameters tab of the padstack.
Is there anything else I need to enable within Allegro (16.5) to get this to work? When I place the connector on my PCB I am not seeing the Antipad Keepouts.
Is this feature only used for the SPECCTRA autorouter?
Thanks in advance for the help!
This option is only applicable if the padstack is used for a mechanical pin. If the padstack is assign to vias or pins that are associated with nets then the anti-pads are applied with their conventional usages (e.g. negative planes or with positive planes overrides for hole generation).
I created a padstack as follows...""Suppress unconnect int. pads: legacy artwork" and "Mech pins use antipads as Route Keepout" boxes checked. Hole type...Circle Drill. Plating...Non-Plated, Drill diameter 50.0. Layers tabs...begin, default internal, end layers all Regular Pad...Circle...40.0 (to avoid copper shavings) and all the Anti Pads...Circle...50.0. Thermal Relief pads...Null. I then add this padstack as a mechanical pin on a part. In the library or on the board I do not see any route keepouts and I can route a trace directly over the hole and do not get an error. Can anyone let me know what I am missing in order to get this option to work?
From Whats New for 16.2...
Mechanical pins are non-logical elements, typically used as
mounting or tooling holes and fiducials. Manually drawn keepout areas are
traditionally attached to the mechanical symbol to restrict etch around the
perimeter of the hole or pad. A new pad usage option, Enable Antipads as Route
Keepouts (ARK), permits the antipad associated with the padstack of
the mechanical pin to be used as an implicit route keepout area. The mechanical
pin checks are located in the Design Modes form.
-- you also need to go Setup-> Constraints -> Modes,sekect Design Modes tab and enable the 2 Mech pin checks
That worked. FYI, I usually add the keepouts on the symbol for mechanical pins and additional ones as needed in the file. The part I was working on was a 12 pin pass-thru connector(SAMTEC) and rather than draw the route keepouts for each on the 12 mechanical pins, I noticed the option in the padstack editor and thought to use that instead. Thanks again for the help.