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design compiler ungroup
the ungroup command removes the hierarchy in the design (netlist) and make it flat..
you can use set_flatten command (options are true and false) to enable and disable this behavior during logic optimization (during compile)...
By default it is set to be false...
when you diffuse drain and diffusion areas,they automatically aligns beneath the polysilicon(as polysilicon acts as a mask)..This is called self aligned structure..
Re: STI
STI(Shallow Trench Isolation) is the process used for physical separation of devices in the Chip.It had replaced the older LOCOS process as it offer more planar surface than LOCOS.Also it is free of undesired phenomena like Birdbeak
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