CAP_TOP_METAL question: support of MiM capacitors in MOCMOS/mosis

[Alexandre Rusev]

I think that adding MiM capacitors to MOCMOS tech is a reasonable thing,

but the capacitor bottom plate layer number (CAP_TOP_METAL) depends on number of layers in particular tech (say SCN6M).

Do I need to add capacitors both for CAP_TOP_METAL==4 and CAP_TOP_METAL==5 to mocmos.xml ???

Or some other approach is to be used for this technology dependence???

Here

https://bears.ece.ucsb.edu/class/ece224a/scmos/scmos-captop.html

and here

https://bears.ece.ucsb.edu/class/ece224a/scmos/scmos-main.html#subm

we can see that additional metal number CAP_TOP_METAL which is used for MiM capacitor depends on the total number of metal layers

Process	Bottom Plate	Top Plate	Top Plate Contact
TSMC_025	METAL4	CAP_TOP_METAL	VIA4 and METAL5
TSMC_018	METAL5	CAP_TOP_METAL	VIA5 and METAL6

SkyWater130 PDK supports particular types of MiM capatcitors (https://skywater-pdk.readthedocs.io/en/latest/rules/device-details.html),

that can be generated with Adam's tool  https://gitlab.com/westernsemico/com.westernsemico.vlsiI didn't learn how to code in the tools' source yet 

For SkyWater we can code particular metal as CAP_TOP_METAL, so no logical problems with it