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how to pass CDF parameter's value of an instance in schematic pcell to CDF parameter of schematic pcell

patwardg

An explanation of the problem I am facing is in order -

I have created a schematic pcell (A) in which I am instantiating the instance of a foundry delivered pcell (B). There are some independent (e.g. Bp, Bq ) and some dependent CDF parameters (e.g. Bx) defined for the CDF  of the pcell B.

So, Bx = FB_callback(Bp Bq)

Bx is calculated whenever I change Bp or Bq, using a call back function which I have absolutely no access to.

I have created 2 independent CDF  parameters for A (which is the pcell I created) - Ap and Aq. In the code for my schematic pcell I pass these values Ap and Aq to Bp and Bq respectively. Something like this -

master_b = dbOpenCellViewByType( "foundry_library" "foundry_cell_B" "symbol" )
inst_b = dbCreateInst( pcCellView master_b "I_B" list( 0.0 0.0 ) "R0")
inst_b~>Bp = Ap
inst_b~>Bq = Aq

However, after this when I print out the inst_b~>Bx then I see that it is not getting changed and is always the default.

How do I make sure that the callback routine for the foudry cell gets called? Also how do I pass the new value of Bx back into my pcell's CDF Ax?

Thanks,

Parents

  •  Hi Andrew,

    Thanks for the quick reply.

    The solution worked and I was able to update the CDF values of the foundry instances.

    Although how do I pass them into the CDF values of the schematic pcell, from the schematic pcell code? When I use cdfgData variable in the pcell code, it's giving me an unbound variable error.

    Thanks,

Reply

  •  Hi Andrew,

    Thanks for the quick reply.

    The solution worked and I was able to update the CDF values of the foundry instances.

    Although how do I pass them into the CDF values of the schematic pcell, from the schematic pcell code? When I use cdfgData variable in the pcell code, it's giving me an unbound variable error.

    Thanks,

Children
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