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What is the most important preparing for layout?

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jaylin

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Halo guys

I am begining for a layout, but I have no experience for it, I am afaind that if I didn't set up the supporting files properly for layout, I may have to restart again after I finish the first layout, so can anybody tell me that what I need to set up before the layout, mostly I need a techfile and display.drf DRC rule and LVS rule, right? Is there anythings that I must to set and notify?

And after I finish the layout, what I should handle to the foundry is only the layout database? or else, anything more?

Have nice days
Jay
 

sunking

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yes, techfile and display.drf DRC rule and LVS rule must have.
after layout, you give gds to the foundry. and the foundry will give your a form, such as process, die size and so on need to provide.
 

jaylin

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Dear Sunking,

Thank you so much, sholud I spec the layer rule(which includes a manufacture grid definition) in the techfile? And How can I set the minmum grip in the layout drawing?


Best Regards
Jay
 

holddreams

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You should have ERC rule, and rules about rc-extraction.
Before sending to the foundry, the designer must check the simulation results whether it is meet the specification or not.
 

YESH_23

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for the grid definition it will be mentioned in the pdk given by the fab

in the layout go to options in that display or just press 'e'

in that x snap spacing y snap spacing as given in the pdk

otherwise at the end of the design it will give a layout grid error.

ya while submitting the design to the fab guy we will give the layout database in GDS format

its a format which will be undrestood by the fab
 

jaylin

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Dear YESH_23,


Would you pls tell me what the "PDK" means?

And I can not find any minimum grid spec from thr foundry for our bipolar process.


Best Regards
Jay
 

p.sivakuamr

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Hi
this is sivakumar,for designing correct layouts first we have to concentrate on technologi file that is we should have good understanding knowledge on tech file and understanding of DRC & LVS rule files and Knowledge on processing layers in the fab.
 

YESH_23

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PDK is process design kit which is given by the fab . in that u can get the do's & dont's and the methodologies to be followed in that particulr process.

layout guide lines for drawing resistors & capacitors every thing will be mentioned.but it is confidential be carerfull.

the minimum grid spec will also be given in that
 

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