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Starting with skill

Inas

Hello,

Now i have a simply skill code to generate a layout having a transistor, and i entered the parameters in a list.

one of the parameters i want o write is the SDshrink but i can't find out how to use it (write it).

ALso i confusde about the CDF parameter types and values, how can i know what should i write?

Thanks alot

  • Hi Inas Mostafa

    I think you will need to check the PDK manuals for more info on sdShrink parameter because this question is specific to your PDK. I google a little and found the following info. Hope that it will be useful for you:

    http://newsgroups.derkeiler.com/Archive/Comp/comp.cad.cadence/2010-12/msg00023.html

    /*****************************************************/
    ;SDshrink ( 1 2 3 4 5 )
    ; 1 = finger #
    ; 2 = start top
    ; 3 = start bottom
    ; 4 = width
    ; 5 = contact spacing

    /*****************************************************/

    and the code if used in the pcell.

    instNTL=dbCreateParamInst(cv tranId
    "ntranl" 0:0 "R180" 1 list(
    list("w" "string" w_n_b )
    list("l" "string" l_n_b )
    list("fingers" "string" sprintf(nil "%d" f_n_b))
    list("m" "string" sprintf(nil "%d" m_n_b))
    stuff deleted.....
    list("SDshrink" "string" "(0 0 0 0 0)")


    Best regards
    Quek

  • Thanks Quek for you fast reply.

    But i have another question please, is there a way to convert a layout done by hand to a skill code just to have an example to me.

    i found on google that in the layout GUI there is a Pcell menu from which we can compile to skill but i couldn't find that on cadence version i'm wrking on 6.1.6.

    Do you know is that available or not?

  • Hi Inas Mostafa

    It is indeed possible to convert a drawn layout into a pcell using graphical pcells feature. This feature is still available in IC616. You can display the "Pcell" menu using "Launch->Plugins->Pcell".

    Please refer to $CDSHOME/doc/pcellref/pcellref.pdf for more details on creating a graphical pcell.


    Best regards
    Quek

  • ok when i do compile he tells me that there is no parameter what does it mean?

  • Hi Inas Mostafa

    Since you are creating a pcell, the tool expects at least 1 parameter. IC5141 package contains a tutorial on graphical pcell ($CDSHOME/doc/celltut/celltut.pdf). You can get a copy of this tutorial from COS.

    Best regards
    Quek

  • sorry but can you tell me what does you mean by a parameter here?
  • sorry for the wrong grammer " what do you mean with parameter?" :D

  • Hi Inas Mostafa

    Parameter refers to the usual parameters (e.g. W, L, etc) that you can find on any regular pcell. You have to parameterize something in your layout (e.g. draw a rectangle and assign "w" as the width parameter).

    The cell tutorial in IC5141 package gives you step-by-step guide on creating a graphical pcell. It would be better for you to look through it.

    Best regards
    Quek

  • I have another question away from skill please. Is there a way to connect to internal nets virtually without putting pins to them?

  • Hi Inas Mostafa

    It would help other forum readers a lot if you can start a new thread for a new topic. This will allow the other readers to follow your issues more easily. It would also be good if you can provide more details in your questions. : )

    Please allow me to re-phrase your question and correct me if I am wrong:

    In layoutXL, it is possible to create virtual connections for top level  pin-to-pins or pin-to-shape by appending a colon to the pin/net name (E.g. ABC:) but it is not possible to create a virtual connection from a top level pin to a lower level pin/non-pin shape.


    Best regards
    Quek

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