for the first couple of items, could you please do...
# ieee-sscs-dc-21q3j
jeffdi
11/29/2021, 4:50 PM
for the first couple of items, could you please do a ‘Git Pull’ from the Workspace tab on the Project Details View? Looks like you are missing the caravel directory under the project root. Please add that to your repo.
l
Luis Henrique Rodovalho
11/29/2021, 4:54 PMhttps://github.com/efabless/caravel_user_project_analog
I'm using this as basis for the project. I didn't properly install it. I'll try making the git project.
j
jeffdi
12/01/2021, 4:18 PM
@User any progress?
l
Luis Henrique Rodovalho
12/01/2021, 4:20 PMNo progress... The first try had some KLayout issues and no Magic DRC issues. After fixing the KLayout, XOR, and Manifest issues, close to 2000 Magic DRC violations appeared. I don't know why the precheck didn't show any Magic DRC failure before fixing the KLayout issues.
Luis Henrique Rodovalho
12/01/2021, 4:25 PMI was using the default Magic DRC check and my design was clean. After switching to full DRC, it showed some errors for nwell spacing for every cell I made. It seems that 5.0 V MVT devices have different nwell spacing than standard ones. I would need to convert all my devices to standard 1.8 V ones or to remake my design. I would need at least a week to finish it and the deadline was last Friday. More than that, the other teams on this chip didn't send me their designs and this chip had only my design. I think it's better to try MPW4, if it is still available, of course.
j
jeffdi
12/01/2021, 4:49 PM
what do you mean by full DRC ? you really only need to pass the MR DRC deck to submit on the shuttle.
jeffdi
12/01/2021, 4:50 PM
we would really like to get you on this shuttle. perhaps we can take a look?
l
Luis Henrique Rodovalho
12/01/2021, 4:50 PMOf course. I'll provide some info. Just a sec.
j
jeffdi
12/01/2021, 4:50 PM
is your repo current?
l
Luis Henrique Rodovalho
12/01/2021, 4:54 PMFirst mpw precheck:
Copy code
STDOUT: {{FAILURE}} 4 Check(s) Failed: ['Manifest', 'Consistency', 'XOR', 'Klayout FEOL'] !!! Copy code
[11/29/21 09:45:15 PST] FAILURE
1 Check(s) Failed: ['XOR'] !!! Copy code
[11/29/21 12:24:25 PST] FAILURE
1 Check(s) Failed: ['Magic DRC'] !!!Luis Henrique Rodovalho
12/01/2021, 4:57 PMThe Manifest, consistency and Klayout precheck failures I fixed by updating the caravel folder. Later, I used the caravel lite empty wrapper, placed my design there and rerouted its top level. So, the XOR precheck failure was solved. Then the Magic DRC violations appeared.
Luis Henrique Rodovalho
12/01/2021, 5:06 PMMy design is really simple. It is a low noise amplifier made with pseudo-resistors and capacitive feedback, such as this.
Luis Henrique Rodovalho
12/01/2021, 5:08 PMBut I replaced the single ended OTA by a fully differential OTA made with inverters, like this one.
Luis Henrique Rodovalho
12/01/2021, 5:12 PMEach inverter block layout is like this. It didn't have any DRC issue using the default Magic DRC settings. But, after I had problems with the MPW precheck, I switched to the complete DRC option in Magic and those violations appeared.
j
jeffdi
12/01/2021, 5:12 PM
can you do a ‘Git Pull’ on the Project Detail tab on the EF platform?
l
Luis Henrique Rodovalho
12/01/2021, 5:13 PMAgain?
Luis Henrique Rodovalho
12/01/2021, 5:14 PMDone.
Luis Henrique Rodovalho
12/01/2021, 5:25 PM@User, if you give me some time, I think I can fix these DRC issues. How much time can you give me? We're already past the deadline by almost a week.
Luis Henrique Rodovalho
12/01/2021, 11:22 PM@User MPW precheck succeeded!
Copy code
[12/01/21 15:20:39 PST] SUCCESS
All Checks Passed !!!