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create a pCell with m-factor

DavidLou

hello experts,

I guess this could be very silly/easy question but puzzles me a couple days now. 

I have a customized cell and want to duplicate its instances. if I just make them as instance array (e.g., cell<1000:1>), it'll slow down my simulation dramatically. So I wonder if I can make it pCell with m-factor so that it'll be seen as single instance for the simulator. but I haven't done any pCell work yet. 

I came up following code from some examples I can find but still compliant there's something wrong. any idea or any better ways to achieve this would be greatly appreciated. 

pcDefinePCell(
list( ddGetObj("cell") "cell" "layout"
) ; end of list for first argument

(
( m "int" 1 )
) ; end of parameter list

prog(
let( lp )

; check parameters
m = if( (m<1) 1 m )

for( lp 0 count-1
  inst = dbCreateInst( d_cellView d_master nil 0:lp*1 "R0" 1 )

return(t)

) ; end of body-of-SKILL-code prog

) ; ; end of pcDefinePCell

thanks,

David

Parents

  • Hi David,

    If you're using VLS XL, you don't really need to do anything. You can have the parameter m in the CDF (and passed to the simulator as an m-factor) and VLS XL will automatically generate that number of instances in parallel. You can then place them, abut them, use them in modgens as you see fit. There are controls in VLS XL to define the parameter used to represent m, but the default includes the parameter name m.

    Coding inside the PCell itself is probably not the best option as then it removes the flexibility to place or interleave devices to improve matching.

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    wow, so straightforward. almost too good to believe. thanks a lot. 

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