while we running caravel_user_project_analog we got some errors in precheck. cvc.oeb.log is attached here for reference. How i rectify this error.

@Saranya P U Errors or warnings? Can you share the

precheck_results/<tag>/tmp/cvc.oeb.report

?

It is showing error.

Can you share

precheck_results/<tag>/tmp/cvc.errors.gz

?

Ok ..lll try nw and update

@Saranya P U I think you can ignore those errors. CVC does ERC rule checking and there are usually false positives on analog designs. BTW, this looks like the default

user_analog_project_wrapper

. Are you just doing a test run?

yes this is a test run before integrating our design...now oeb eerror is not there but having lvs error

I’m not sure how much effort you want to put into making the example project pass LVS. You’ll need to look at the

precheck_results/<tag>/tmp/lvs.report

file and modify

lvs/user_analog_project_wrapper/lvs_config.json

accordingly. To integrate into the

user_analog_project_wrapper

, I’d start with

user_analog_project_wrapper_empty

, rename it to

user_analog_project_wrapper

, place your macro in there and connect the pins. Save the final design to gds and submit to efabless. This might help.

Thank you very much for your valuable suggestions.

How did you create the original gds? I think klayout might be easier, but that’s probably a personal preference.

Ok. Thank you.

@Saranya P U @Mitch Bailey Following steps can be used to integrate your layout inside caravan wrapper layout in magic : • Instantiate your magic layout inside

caravel_user_project_analog/mag/user_analog_project_wrapper.mag

• Manually connect pins of your user layout to pins of wrapper layout • Instantiate user design symbol in schematic

xschem/user_analog_project_wrapper.sch

and export its netlist as

xschem/user_analog_project_wrapper.spice

. During export netlist, select following option in xschem

"LVS Netlist: top level is .subckt"

And copy that netlist to the

netgen

folder so the precheck consistency check passes.

Here are remaining steps in sequence. @Mitch Bailey Please complete if missing any. • Run spice extraction on top level layout

mag/user_analog_project_wrapper.mag

to generate layout netlist

mag/user_analog_project_wrapper.spice

for LVS • Copy this

mag/user_analog_project_wrapper.spice

to

netgen/user_analog_project_wrapper.spice

for running LVS using

netgen/run_lvs.sh

script. • Export GDS for

mag/user_analog_project_wrapper.mag

layout to

/gds/user_analog_project_wrapper.gds

@vks copying

mag/user_analog_project_wrapper.spice

to

netgen/user_analog_project_wrapper.spice

doesn’t really do anything besides allowing the precheck consistency check to pass. The

xschem/user_analog_project_wrapper.spice

file, if available, should probably be used instead.

Ok. We are working on this. Will be moving on to LVS check after the integartion to wrapper is complete.