On-Chip Variation in VLSI | OCV | Why OCV occur | How to take care of OCV | AOCV | POCV

On-Chip Variation - OCV is an Important issue in VLSI Design. What is OCV, How OCV occurs, Why OCV occurs, What could be the effect of OCV and How to take care of OCV, All these things have been explained in this tutorial in details. AOCV and POCV have just introduced in this session.
There are various factors which could occur while fabricating the chip and it affects the delay and transition of a cell. Since these variations are very unpredictable and could vary dia to dia or lot to lot so we need to take care of these variations.
Some main sources of these variations are local process variation (like Random Dopant Fluctuations RDF, Line Edge Roughness - LER , Oxide Thickness Variations - OTV and Width and Length variation of Channel )mInternal voltage and temperature variations.
If These variations are not taken care in STA, This may cause post-silicon failure.
To take care of these variations we apply derates over the standard cells delay. Derate factor actually adds some timing pessimism on standard cell's delay.
AOCV is advance OCV and POCV is Parametric OCV which are latest techniques to take care of OCV.
If you feel this video is relevant to your domain and useful, please like the video and subscribe to this channel.
Your queries/suggestions are most welcome in the comment section.
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#OnChipVariation #OCV #Derate

[@tamilselvanselvaraj1798]

Thanks for making such wonderful lecture.... Please continue your videos....VLSI needs you

[@TeamVLSI]

Thanks, sure will continue...

[@sudhirkambhampati9027]

The video which is comparing AOCV , POCV is brilliant . A lot of STA engineers are in execution mode these days and they really cant get the feel of why they are fixing so many paths. whether they are real paths or are we just squeezing the design by signing off with AOCV derates at 7nm. apart from this video i found a couple of similar videos in youtube which were very helpful. This selfless nature of sharing knowledge in public platform should be applauded and i really hope this video series will get more views over the course of time. One feedback that i can think of is improving the english pronunciation , but again that is very minor drawback . as long as people are understanding the concept its good enough! CHeers!

[@TeamVLSI]

Hi Sudhir,
Thank you so much for your kind appreciation. Your appreciation give me a boost to work in more better way, Keep it up, and keep supporting us.
Yes, I accept the drawback you pointed, Its natural but it can be improved and I am focusing on that.
I would like to hear more from you, keep supporting , keep suggesting, and keep learning!!
Happy learning and happy sharing :)

[@str2237]

Hi Sudhir can u plz share the other video links here.....thankyou....

[@sidduprince12345]

Very interesting and nice to hear your videos on vlsi , tks for ur explanations

[@TeamVLSI]

Thanks Siddeshm, for your kind appreciation. Keep supporting and keep watching this space for more such videos.

[@tamilselvanselvaraj1798]

Very simple and clear explanation sir.. Thanks

[@TeamVLSI]

Keep watching, Thanks Selvan!

[@maihuonglethi1674]

The video sound is pretty good, beyond my imagination

[@sumanthreddyvanga2939]

Simply Superb. Continue uploading these PD topics and also try to upload IR, LEC, DFT topics too. So that it will be helpful for non-PD guys as they will get exposure.

[@TeamVLSI]

Thanks Sumanth,
We will try to cover the suggested domains as well.

[@anoopvgopi4091]

Nice explanation.. thanku Sir 👍

[@TeamVLSI]

Thanks, Anoop.

[@kumudsingh5067]

Nice explanation!!

[@TeamVLSI]

Thanks Kumud,
Glad you liked it!

[@habibakhatunnesaragi6259]

Nicely explained...sir excepting many more videos on icc2

[@TeamVLSI]

Thanks @Habibakhatun

[@habibakhatunnesaragi6259]

Sir do not forget to explain the details on AOCV POCV .

[@TeamVLSI]

Sure.

[@praveenkandi2427]

Very good lecture. Sir please try to give a lecture on OCV, AOCV, POCV and LVF. Also how we are using them in stf file

[@TeamVLSI]

sure @Praveen, but wait for some time. I need to prepare...

[@vinodkumarck1919]

Good video, thanks

[@TeamVLSI]

You're welcome.

[@MrBabajikijai]

good video

[@varaprasadvlsi7549]

Hello please do one session related to POCV detailed thanks in advance

[@TeamVLSI]

Hi @Varaprasad,
We will do this soon.

[@TeamVLSI]

Now a video on comparative analysis of OCV, AOCV and POCV has been published.

[@shivaramporika2189]

super

[@TeamVLSI]

Thank you Shivaram.

[@gayathrilasyamarkapuram2160]

thank u so much sir

[@TeamVLSI]

Most welcome.

[@gangadharguptakvs1581]

Sir Nice lecture @OCV👌 , Waiting for a session on AOCV & POCV.

[@TeamVLSI]

Thanks, dear. I am planning to do that.

[@roopalig3677]

@@TeamVLSI sir, waiting for session on AOCV & POCV

[@TeamVLSI]

Now a video on comparative analysis of OCV, AOCV and POCV has been published.

[@gowthampk100]

Hi Sir, your explanation is quite useful.. Thank you for your effort.. can you please name the books to have a better knowledge on these topics.. That would be of great help..

[@TeamVLSI]

Hi, There are many books which I have followed in past. Check in the description of video, I will update the list of books . But honestly while preparing the video, I don't refer them now.

[@wescose1]

very well explained. Just a query.
5% of cell delay is the derate? Or 5% of what value is the derate?

[@TeamVLSI]

Thanks Nitin.
5% of cell delay like if any cell has delay = D then new delay will be considered 0.95D or 1.05D.

[@wescose1]

@@TeamVLSI thanks for the clarity

[@hungvoquoc1761]

hi sir, i would like to ask that: AT 11:24 in video, Does OCV include process system variation ?
Thank you, sir

[@ManjuSharma-ee5mc]

Hello Sir , your explanation of the concept was very helpful. Great work sir !!!!! Sir can you please explain more about systematic process variations.

[@TeamVLSI]

Thanks a lot Manju!
Yes I could have done this in much details but I didn't because I had the maintain the length of video.
But Yes If will get time, I will come to this topic in future.

[@arunpandiyananbarasu1455]

please upload aocv,pocv,socv

[@TeamVLSI]

Okay Arun. I will do that.

[@roopalig3677]

@@TeamVLSI Hello Sir, Waiting for session on AOCV & POCV

[@TeamVLSI]

Now a video on comparative analysis of OCV, AOCV and POCV has been published.