Hi, I started to study Skywater130 PDK. I have a doubt on design rules concerning metal1 to metal2 contact. I tried to make a via of 150x150 nanometers as in the screenshot. Why Magic complains saying: "Via1 width < 0.26um (via.1a + 2 * via.4a) " ? Checking the rules via.1a and via.4a I found: 1) via.1a : Min and max L and W of via outside areaid.mt 150 nanometers. 2) via.4a: 0.150 µm Via must be enclosed by Met1 by at least … 55 nanometers. My contact is 150 x 150 nanometers and metal1 encloses it more than 55 nanometers. Where am I wrong? Giuseppe.

In magic, you do not draw vias and contacts individually. You specify the region that you want filled with via or contacts and when magic writes gds, it will fill the region with drc clean shapes. Therefore, the “vias” drawn in magic must be at least 0.26um (0.15 + 2*0.055). You do not need to worry about met1, met2 enclosure because magic will add that if necessary at cifout. You can “see” the actual shapes that magic will output with

cif see VIA

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Understood, Magic works with abstract layers. Thanks for the tip.