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Open ports in special route summary

Greatrebel

Hi All,

I got a summary after special routing below. It shows there are some ports open for stripe and core. But when I use verifyConnectivity to check, there are no violations. Is that a serious issue for PnR. How can I locate these open ports. Thanks in advanced

  Number of IO ports routed: 4
  Number of Block ports routed: 6
  Number of Stripe ports routed: 80  open: 2
  Number of Core ports routed: 185  open: 399
  Number of Power Bump ports routed: 0
  Number of Followpin connections: 292
  4 ports open due to poor power planning

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  • Kari

     You should do a visual check of your design. Highlight all the pwr/gnd IO pads, and make sure they all connect into the pwr grid. Take a look at each macro and make sure there are pwr/gnd connections to each. The std cells should all be connected to the followpin rails, but you may want to make sure each rail vias up to a stripe. You can run verifyPowerVia to make sure you have no missing vias in your pwr/gnd grid. Make sure you run an IR-drop analysis as soon as you can to point out any weaknesses in the grid.

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  • Kari

     You should do a visual check of your design. Highlight all the pwr/gnd IO pads, and make sure they all connect into the pwr grid. Take a look at each macro and make sure there are pwr/gnd connections to each. The std cells should all be connected to the followpin rails, but you may want to make sure each rail vias up to a stripe. You can run verifyPowerVia to make sure you have no missing vias in your pwr/gnd grid. Make sure you run an IR-drop analysis as soon as you can to point out any weaknesses in the grid.

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