How to enable the zone adherence checks for component placement

In Rigid-Flex designs components are placed either on rigid or flex zones. In some situations, if the components are placed in between the zones, it means that a group of pins is present in rigid zones and some pins are in other zones (with a different stackup), which can cause pins and part of component to be floating in the air. This detection is driven by the symbol origin location, which, when moving the component dynamically, switches to the appropriate layer, so it is ready for placement. 

Starting SPB 23.1, Allegro PCB Editor has Zone Placement Adherence design checks. These checks are provided in Analysis Modes to verify that all pin pads of a component exist within the placement zones. These checks, if enabled, will check any portion of the pad that crosses over an area of zones.  

To enable these checks in Constraint Manager, go to Analyze > Analysis Modes > Design > Zone Placement > Adherence. 

Two checks are added here: 

1.) All SMD Pads must exist on placement layer 

• Verifies that all SMD pads of a component are fully on the placement layer or within the placement zone 
• Is disabled by default 

2.) All Thru Hole pins must start on placement layer  

• Verifies that all thru hole pads of a component are fully on the placement layer or within the placement layers 
• Is disabled by default 

Embedded components are also subjected to this check and generate DRC errors. Vertical-placed or dual-side-contact-embedded components will be excluded from this DRC check.