Purpose |
Lines which pass close to a pad must be fully covered by mask in order to avoid solder bridging between the line and the pad during the assembly process. |
Function |
Reports traces (or any other circuit features) that are too
close to or touch a solder mask clearance that exposes a pad belonging to
another copper net. Measurements included if the distance between the circuit
and the clearance is less than the pp_coverage action
parameter. Typically, each clearance has a trace that intersects it.
The trace that touches exposed copper; if it does not connect to an inner pad
it is considered a violation. In cases where the trace connects the first
time legally and also connects a second time in a manner that causes a
coverage violation, this is detected by setting the ERF variable cover_special_check
= 1. This, check, however, requires a considerable amount of processing time |
Activation |
|
Known Limitations |
To avoid false alarms near SMD picture frame openings and
drawn areas, a filter is applied. If the distance to the other net exposed
copper is greater than 1.5 times the pp_coverage action
parameter, the measurement is filtered. This causes coverage violations in
oversized clearances to go unreported. |