Assura post-layout sim with standard cells

Discussion in 'Cadence' started by S. Badel, May 19, 2004.

  1. S. Badel

    S. Badel Guest

    In Diva it is possible to do a macro-mode extraction, so as
    to extract only the top-level of the hierarchy and keeping
    instances in the extracted view. This allows to run
    top-level LVS and to run post-layout simulation with
    standard cells for which layout is not provided and so
    full extraction is not possible.

    In such a flow one can use the schematic of the standard
    cell for simulating, while introducing the parasitics due
    to interconnects on higher levels of hierarchy. In essence
    the extracted view contains the same hierarchy as the
    layout view with added parasitics.

    I found the same is possible in assura LVS with the
    ?blackBox parameter, which allows not to compare
    the cell itself but its connections only. This works, however
    when using RCX after such a LVS pass, the black box
    cells do not appear as instances in the av_extracted
    view, thus making it impossible to simulate post-layout.

    I couldn't be able to get the same behavior as in diva,
    nor find a different flow to allow parasitics simulation
    with cells whose full layout is not available.
    Is it possible ?


    S. Badel, May 19, 2004
  2. S. Badel

    Erik Wanta Guest

    You can generate a dspf file. You can specify all the standard cells
    with a property called dspfcells I think.
    Erik Wanta, May 20, 2004
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