drc in semi-custom design

Hi,

I am doing a semi-custom design asic design. For the back end tool, i have used
First Encounter. Eventually, in this tool i only can see a black box of the standard cell of the design. So, I have import it to virtuoso, to see the transistor level of the design and do the DRC check. But when i do the DRC check in virtuoso, there is DRC error almost in every standard cell. From my view, every standard cell should be clean from DRC but i am not sure why there is a DRC error in standard cell. Can anyone give opinion on this?
Thank you.

Siva

hello Siva

Well i worked on layouts using cadene virtuoso some months ago and used Calibre for DRC. well as u said DRC resutls showed errors even for the standard cell which are supposed to be error free .... now comes wat errors does DRC report show .. because it is showing the density errors .. then wat u can do is in the DRC rules file .. comment the check for densities and same way keep commenting untill its shows no errors for the stardard cell .. this wat i did wen i had probs .. so please try this way and let me if i am wrong r if that appraoch is wrong .
as far my work was concerned .. it worked perfectly welll .........because according to me ., the density errors are just like any warnings ..... i made layouts using this and got the expected results ....

suresh

well.
1. use Calibre for DRC check instead;
2. Smash your design in Encounter, before you import it to Virtuoso, since the Virtuoso can't see standard cell hierarchy info.

regards

Added after 5 seconds:

well.
1. use Calibre for DRC check instead;
2. Smash your design in Encounter, before you import it to Virtuoso, since the Virtuoso can't see standard cell hierarchy info.

regards

Hi Siva,

While doing semi-custom design the last thing, you want to have is DRC inside standard cells, bcoz u cant do much to clear them. By the way which std cell library are you using. Contact the nendor and get it right

Hello guys ...

Well its a good idea to suggest to use Mentors calibre for DRC and LVS which is a industry standard method ... buy frinds wat if we dont have license to use mentors .. i am just curious coz i wuld like to know if it is easy to get mentors calibre for DRC and LVS ...please let me know

suresh