pin location

Hi Boris,

We've got a procedure we use that incorporates the dbTermLoc that you've already identified. After sourcing this proc, you'd just have to type "queryInstPin_loc myInstance/pin"

proc queryInstPin_loc { { instPin "" } } {
  loguse procedures queryInstPin_loc
# queryInstPin_loc: returns the location of the <inst>/<pin>
  if { $instPin == "" } {
    puts ""
    puts "   Usage:  queryInstPin_loc  <inst>/<pin>"
    puts ""
    puts "      returns the location of pin <inst>/<pin>"
    puts ""
  } else {
    set scale [pdsDBU2Micron 1]
    set numbFields [regsub -all "/" $instPin " " inst_pin]
    set pin [lindex $inst_pin $numbFields]
    regsub -all {[[$^?+*()|\\]} $pin {\\&} escPin
    regsub -all "/${escPin}$" $instPin "" inst
    set instPtr [dbGetInstByName $inst]
    if { $instPtr == "0x0" } {
      puts "Didn't find inst $inst"
    } else {
      set termPGPtr "0x0"
      set termPtr [dbGetTermByName $instPtr $pin]
      if { $termPtr == "0x0" } {
        set termPGPtr [dbGetPGTermByName $instPtr $pin]
      }
      if { $termPtr == "0x0"  &&  $termPGPtr == "0x0" } {
        puts "Didn't find signal or power pin named $pin on inst $inst"
      } else {
        if { $termPGPtr == "0x0" } {
          set pinLoc [dbTermLoc $termPtr]
          set dbXY  [dbTermLoc $termPtr]
         } else {
          set pinLoc [dbTermLoc $termPGPtr]
          set dbXY  [dbTermLoc $termPGPtr]
        }
        set dbX [lindex $dbXY 0]
        set dbY [lindex $dbXY 1]
        set x [expr $dbX * $scale]
        set y [expr $dbY * $scale]
        return "$x $y"
        return $pinLoc
      }
    }
  }
}

Thanks!

Hi,

Can I get Power ground pins metal gemoetries specified in lef using any command?

I want to put Metal1 stripe over Metal1 Power ground Pins over each Instance of desig.

Not able to get any command to get the geometries . 

Appricate your help. 

Thanks,

Pradeep

Although signal pins are made up of multiple geometries they are additionally stored in the db as "dbGet top.insts.instTerms.pt". When we want to get just a rough idea of where the pins are for troubleshooting distances between pins this simple xy is useful.

However, if you want to access the detailed geometries that make up a pin - whether it's a signal pin or a pg pin - the key is querying the geometries off the cell master and then transforming it to the location the instance resides at with dbTransform.

Have a look at this solution which can be discovered on support.cadence.com with a search for "pg pin coordinates":
http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11723882

The key is to query the geometries off the cell master then use dbTransform to simplify translation of those coordinates to the chip-level.

Here is a script to do just that :

set inst [dbGetInstByName i0]

foreach pgCellTerm [dbGet $inst.pgCellTerms] {

  puts "[dbGet $pgCellTerm.name]"

  foreach pin [dbGet $pgCellTerm.pins] {

    puts "[dbGet $pin.allShapes.layer.name] [dbTransform -localPt [dbGet $pin.allShapes.shapes.rect] -inst $inst]"

  }

}

Hope this helps,
Bob

Perfact Bob, was looking for exactly same soulution you mentioned. 

Thanks a bunch. 

Regards,

Pradeep

 Hi Pradeep,

Just wanted to chime in - sounds like you're trying to route the std cell pwr/gnd rails? Any reason you don't want to use sroute for that? Just curious, and thought I might be able to save you some work if that's what you were trying to do.

- Kari

 Hi Kari,

Partially yes, I am doing it to do connection of power ground pin to my global Power mesh , but instead of using sroute I am doing Power grid aware placement of few cells such that they come exactly under power grid and and the power pins wil get allign to middle of power mesh stripes to avoid any IR issues on these cells. These are Low power cells which has dual power rail. 

 Hope this will clearify my implementation requirements. 

Thanks,

Pradeep