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core to io distance

gops
What is the criteria for choosing CORE TO IO DISTANCE??How should i select the core to IO distance
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  •  Hi Gops,

    You're on the right track! You definitely want enough space for your VDD and VSS ring plus the space between them (5u+5u+2.5u), but also add some space for the distance from the edge of your IO cells to the start of the pwr/gnd ring and from the other side of the pwr/gnd ring to the core, so that you don't have metal spacing violations in these areas. You could look in your LEF file for the largest spacing rule for the metals and use that value (use the spacing rule for the widest metal on the IO side, since there may be wide metal busses inside the IO).

     Hope that helps,

     - Kari

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  •  Hi Gops,

    You're on the right track! You definitely want enough space for your VDD and VSS ring plus the space between them (5u+5u+2.5u), but also add some space for the distance from the edge of your IO cells to the start of the pwr/gnd ring and from the other side of the pwr/gnd ring to the core, so that you don't have metal spacing violations in these areas. You could look in your LEF file for the largest spacing rule for the metals and use that value (use the spacing rule for the widest metal on the IO side, since there may be wide metal busses inside the IO).

     Hope that helps,

     - Kari

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