What inputs are needed at CTS for sub-blocks?

o   The top-level SDC must correctly define the clocks reaching the input clock ports of the sub-blocks.

o   If a sub-block generates clocks that are used by other blocks or the top level, these generated clocks must also be properly defined (e.g., using create_generated_clock sourced from a sub-block's output pin).

o   Sub-Block Timing Model (.lib) and Physical Abstract (LEF):

o   CTS Exceptions for Sub-Block Pins: