report_power -instances does not support hierarchical instances

[rbarzic]

Hello,

I'm trying to evaluate the power reporting capabilities of OpenSTA on a hierarchical netlist and spef generated by Cadence (Innovus).

After readling the libraries, netlist and the spef file for the design, I do : read_power_activities -vcd waves.vcd -scope tb/U_CHIP/U_CPU then report_power -instances { U_CPU/U_RF/FE_COEC10229_n_1608 U_CPU/U_RF }

and I get :

Internal Switching Leakage Total Power Power Power Power (Watts)

3.32e-15 3.45e-15 0.00e+00 6.77e-15 U_CPU/U_RF/FE_COEC10229_n_1608 0.00e+00 0.00e+00 0.00e+00 0.00e+00 U_CPU/U_RF

I would expect the report for the U_CPU/U_RF to include at least the number for the instances below its level

(I'm using the master branch, commit 6b8ab8aa)

[jjcherry56]

That is because the instances arg does not support hierarchical instances (which would be a good enhancement). The instances arg is mostly used for debugging. If you use [get_cells U_CPU/U_RF/*] the totals will show you the power in the hierarchical instance.

[rbarzic]

Ok thank you, But what about the command report_power without option? Will this report the power for the top-level without the contribution of the subblocks?

[jjcherry56]

yes

[jjcherry56]

commit 4b009e5 report_power -instance hierarchical