I'm getting a couple errors with both a magic-generated SONOS and @Tim Edwards SONOS array (sorry for the late tag).

N-well overlap of Deep N-well < 0.4um outside, 1.03um inside

and

SONOS transistor must be in cell with abutment box

. I think I'm missing something basic about nwells, pwells, and dnwells; no matter what kind of nwell overlap I try the error stays. I've searched for information on abutment boxes but can't find too much

Tim will be able to give you a more thorough answer. Deep nwell needs to be surrounded by an nwell ring. The nwell ring extends at least 0.4um beyond the deep nwell, and the deep nwell and nwell overlap at least 1.03um. I believe an abutment box is used for tiling. See this link about how to set it https://open-source-silicon.slack.com/archives/C016H8WJMBR/p1662904893242129?thread_ts=1662662701.454629&cid=C016H8WJMBR

Figured out the N ring. Thanks! I added

FIXED_BBOX

to the single SONOS cell. That error is clear in the cell, but still present in

user_analog_wrapper.mag

.

I don't remember offhand why I had the requirement for an abutment box around SONOS, but I think it has to do with using the abutment box to generate one of the mask layers. It is probably just an oversight that it is missing from the generated cell. It is okay to manually edit the generated cells---just be aware that if you change any parameters from the parameterized cell properties window, those changes will get overwritten.