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parasitic extraction question on sub-blocks using top-level RCE

life

Hi,

If I have a RCE .spf file for a top level cell (for example Cell A) which is comprised of multiple sub-blocks, can I use this same RCE file on simulations where I am only using sub blocks in a test bench? 

To clarify in an example:
Assume the top level cell (Cell A) is comprised of sub-blocks X, Y, and Z, and I only have the parasitic extraction of Cell A (top level). Now let's say I have a new test bench that is only simulating sub-block Y and miscellaneous logic. Can I include this SAME RCE of the top-level Cell A in the .spf files and if so, will Cadence be able to pull the appropriate parasitic data on the nets that I have for sub-block Y? 

Parents

  • It rather depends on whether the DSPF is hierarchical. If it's flat, then no (for fairly obvious reasons). If it's hierarchical and the sub-blocks exist as separate .SUBCKT entries (DSPF is SPICE-like), then it should work, I think; Spectre should tell you if it has a problem finding a match or not.

Reply

  • It rather depends on whether the DSPF is hierarchical. If it's flat, then no (for fairly obvious reasons). If it's hierarchical and the sub-blocks exist as separate .SUBCKT entries (DSPF is SPICE-like), then it should work, I think; Spectre should tell you if it has a problem finding a match or not.

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