How resistive is poly ? Like when using a single stripe of poly to cross several patches of diffusion to create a bunch of transistors sharing the same gate, how long can you reasonably make it ?

From the PDK i found that poly has 48.2 ohm/square.

That is high. Usually poly (silicided) has around 7ohm/sq.

@Christoph Weiser Where di dyou get that value from ? Maybe it's the one for poly resistors (which I'd assume they make on purpose as resistive as possible).

There appears to be a couple of different resistor descriptions. Here is what I have found and what I have been using. https://skywater-pdk.readthedocs.io/en/main/rules/device-details.html#generic-resistors

Yeah I don't want a resistor, but I'm making a ROM and so the word line is a long poly crossing several diffusion and I wanted to know how many I can realistically cross before needing to add a connect point back to a metal word line.

you're going to need to make some RC network simulation

Yeah, I think I basically need to do the layout and then extract and then see what's viable 😅

Magic will extract the 48.2 ohm/square. https://github.com/RTimothyEdwards/open_pdks/blob/9a211591fe74c3d51a14b12f0c662ae0de82b425/sky130/magic/sky130.tech#L5250

yes it's possible to assume capacitance is donimated by prelayout gate and connect several transistors with resistors estimating the amount of squares between each gate

yeah, I know there is 4.66 squares between transistors (including the length of the gate itself). Not I'd just need to know the capacitance of the gate.