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Finding pins on side of the given cell

ssuhas

Hi,

I just wanted to know how do we find the pins on each side of the given cell in SOCE.

 

Thanks

Parents

  • The way I'd go about it is calculating how many signals you can fit in a micron.  Estimate it for 10 or 100 microns for example.  Look at the pitch to determine how many signals can fit without the power grid, then subtract what the power grid consums.  Add up layers and it tells you how many signals you can fit per micron.  An aside here is that you'll find yourself considering whether your power grid is efficiently alligned with respect to your signal tracks -- often the power grid isn't designed so considerately.

    Then, sum the pins on both sides of hard macro facing each other since all of the signals will need to escape on one side or the other.  Then multiply the number of signals by the signals per micron number you calculated to determine the channel width.

    Let us know what you think and how it goes.  It sounds like there may be some room for tool enhancement in this area beyond what estimatePtnChannel does if it is indeed not delivering efficient clarity into the situation.

    Hope this helps,
    Bob

Reply

  • The way I'd go about it is calculating how many signals you can fit in a micron.  Estimate it for 10 or 100 microns for example.  Look at the pitch to determine how many signals can fit without the power grid, then subtract what the power grid consums.  Add up layers and it tells you how many signals you can fit per micron.  An aside here is that you'll find yourself considering whether your power grid is efficiently alligned with respect to your signal tracks -- often the power grid isn't designed so considerately.

    Then, sum the pins on both sides of hard macro facing each other since all of the signals will need to escape on one side or the other.  Then multiply the number of signals by the signals per micron number you calculated to determine the channel width.

    Let us know what you think and how it goes.  It sounds like there may be some room for tool enhancement in this area beyond what estimatePtnChannel does if it is indeed not delivering efficient clarity into the situation.

    Hope this helps,
    Bob

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