--- write_timing_model propagated clock ---
--- read back clktree model ---
--- write_timing_model with latency + uncertainty ---
--- read back clktree2 model ---
--- write_timing_model latch with min/max ---
--- read back latch model ---
--- write_timing_model multicorner propagated ---
--- read back multicorner propagated model ---
--- write_timing_model with clock transition ---
--- read back clock transition model ---