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Restrict buffer use for a particular sub block while routing using INNOVUS

RohithSivakumar

Is it possible to route clock tree with up to 8x buffers for everything except one particular sub block where buffers larger than 4x are not used? 

  • Hi Rohith,
    you cannot define CTS buffers on submodule basis. You can, however, define buffer cells for clock trees and power domains.
    So if you define a separate power domain for this hierarchical instance, you can control the CTS buffers within the hierarchy. You might want to define the clock ports
    as dont_touch, so that CTS does not clone it.
    Alternatively, you can define a clock tree for this subhierarchy, but for this you will have to add a buffer to serve as a source for the new clock tree.
    You can use the root attribute cts_buffer_cells / cts_inverter_cells (In legacy UI: set_ccopt_property buffer_cells) to define the buffer cells for the different power domains.
    Please refer to the Innovus user guide and Text command reference for further information about the usage of these attributes.

    Dimo

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