open-source-silicon.dev

Hi, Does anyone know where I can get details on exactly which mask layers are required to draw the layout for each of the devices in sky130_fd_pr, or a cell layout library of primitives which I can use in magic.  I've looked at <https://skywater-pdk.readthedocs.io/en/latest/rules/device-details.html> but can't get the detail I'm looking for.  The best I've done so far is tried to reverse engineer some of the cells from the io library.

The default open_pdks configures magic to be able to generate a whole slew of devices. WHat devices in specific did you want to work with?

```nmos (MOSFET)
pmos (MOSFET)
n-diode
p-diode
MOS varactor
NPN 1.0 x 1.0
NPN 1.0 x 2.0
PNP 3.4 x 3.4
inductor 1
inductor 2
inductor 3
substrate contact (1.8V)
substrate contact (5.0V)
deep n-well region
mcon
via1
via2
via3
via4
n-diff resistor (1.8V) - 120 Ohm/sq
p-diff resistor (1.8V) - 197 Ohm/sq
n-diff resistor (5.0V) - 114 Ohm/sq
p-diff resistor (5.0V) - 191 Ohm/sq
poly resistor - 48.2 Ohm/sq
poly resistor - 319.8 Ohm/sq
poly resistor - 2000 Ohm/sq
p-well resistor - 3050 Ohm/sq
l1 metal resistor - 12.2 Ohm/sq
m1 metal resistor - 125 mOhm/sq
m2 metal resistor - 125 mOhm/sq
m3 metal resistor - 47 mOhm/sq
m4 metal resistor - 47 mOhm/sq
m5 metal resistor - 29 mOhm/sq
MiM cap - 1fF/um^2 (metal3)
MiM cap - 1fF/um^2 (metal4)
vpp 11.5x11.7 m1-m4, li/m5 shield
vpp 11.5x11.7 m1-m2
vpp 8.6x7.8 m1-m2 l1 shield
vpp 4.4x4.6 m1-m2 l1 shield```

<@U0170EWVCRM> I'm principally interested in the sky130_fd_pr devices for analog design.  I can see the generated devices which I think you're referring to but it's mainly a bunch of examples.  For now I'm mainly interested in both PMOS and NMOS 1V8 devices and the native NMOS devices.  I'm going to need to choose W/L and NF for all of the devices I intend to use and it's not clear exactly which example corresponds to which device apart from a best guess made from the file name which isn't as concrete as I'd like. For instance "libs.ref/sky130_fd_io/mag/sky130_fd_pr__nfet_01v8__example_55959141808533.mag" is probably an example of a "sky130_fd_pr__nfet_01v8" but it could also be an LVT or a native.

image.png

<@U01H2JMLFLL> This is the generator I was talking about along with the generated layout in magic.

Some people in <#C016HUV935L|analog-design> prefer to generate in magic and layout in KLayout.

Ah, I've not seen that generator.  Where do I find that? I intend to use magic for both gen. and layout for now yes.

I got it from here: <https://github.com/RTimothyEdwards/open_pdks>
You have to specify the correct rc file when running magic.
`magic -d OGL -rcfile $PDK_ROOT/sky130A/libs.tech/magic/sky130A.magicrc`