Sliver and Short Sliver Categories (Power and Ground)

These two categories deal with slivers, narrow strips of copper between two features or between non-adjacent sides of the same feature. It is important to detect slivers which could break off during the manufacturing process and cause shorts. In detecting slivers, length, width and shortest perimeter length are measured.

These categories do not detect acute angles. To detect acute angles as slivers, set ERF parameter pp_sliver = 12 mils or more (this may also cause additional reports of non-critical violations).

Applying the Sliver DFx Variables

When the two features are not connected (not on the same net), v_dist2sliver_ratio and v_min_sliver_perim become irrelevant.

Slivers found on hatched areas (a plane filled with lines instead of solid copper, where each line in the area has the attribute Hatch Feature) are reported only if ERF variable replace_crosshatch_by_surface=by_attr. (Default value = yes).

However, if the surface is filled with at least fifty lines of the same width, it is accepted as a hatched area even if the lines do not bear the Hatch Feature attribute and ERF variable replace_crosshatch_by_surface=no.