Hi, could anyone confirm me if tracks are taken as shown in Fig1 or Fig2? In Fig3 I compiled some figures from different sources. The figure 2.1 (from a thesis directed by prof. Stine) and Figure-5 are similar to my Fig 1, where the first track is placed in the middle of the power rail. But the sky130 hd standard cell is similiar to my Fig2, in which (as you can see) the input port A seems to be at the middle of the current grid drawn, like if the first track would have started above the middle of the power rail (as in Fig2). Thanks in advance.

All the SkyWater standard cells put the origin at half-pitch in both X and Y. The power rails are then centered between tracks. The pitch values for the HD library are, for example, 0.46um and 0.34um You can line up the grid in magic by specifying the grid offset as half the grid pitch:

grid 0.46um 0.34um 0.23um 0.17um

Ok, Tim very clear, thanks. In general (for example for GF180 or others) is this the way tracks are placed (I mean with that offset) or it depends on each PDK?

It depends on the PDK, but half-pitch offset is pretty typical.

Thanks a lot Tim 🤝🏼