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core size.

gops
what is the criteria for selecting core utilization?? When i import a design into encounter , a core area comes by itself with a default core utilization.?On what basis the tool does this? How could i get an optimized value for my CORE AREA, CORE UTILIZATION?
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  •  It really depends on the technology, library, number of routing layers, etc. It can also depend on the timing and how much timing margin you want. For example, if you want to fix hold timing with 100ps extra margin, you will need more room for buffers. I typically start a block at about 65%. Sometimes we find we need a lower util, sometimes we find we can squeeze it tighter. It can also depend on how much of your design is std cells and how much is RAM or other IP.

     - Kari

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  •  It really depends on the technology, library, number of routing layers, etc. It can also depend on the timing and how much timing margin you want. For example, if you want to fix hold timing with 100ps extra margin, you will need more room for buffers. I typically start a block at about 65%. Sometimes we find we need a lower util, sometimes we find we can squeeze it tighter. It can also depend on how much of your design is std cells and how much is RAM or other IP.

     - Kari

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