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PDNSim

License

PDNSim is an open-source static IR analyzer.

Features:

  • Report worst IR drop.
  • Report worst current density over all nodes and wire segments in the power distribution network, given a placed and PDN-synthesized design.
  • Check for floating PDN stripes on the power and ground nets.
  • Spice netlist writer for power distribution network wire segments.

Commands

set_pdnsim_net_voltage -net <net_name> -voltage <voltage_value>
check_power_grid -net <net_name>
analyze_power_grid -vsrc <voltage_source_location_file> \
                   -net <net_name> \
                   [-outfile <filename>] \
                   [-enable_em] \
                   [-em_outfile <filename>]
                   [-dx]
                   [-dy]
                   [-em_outfile <filename>]
                   [-node_density <node_pitch>]
                   [-node_density_factor <factor>]
write_pg_spice -vsrc <voltage_source_location_file> -outfile <netlist.sp> -net <net_name>

Options description:

  • vsrc: (optional) file to set the location of the power C4 bumps/IO pins. Vsrc_aes.loc file for an example with a description specified here.
  • dx,dy: (optional) these arguments set the bump pitch to decide the voltage source location in the absence of a vsrc file. Default bump pitch of 140um used in absence of these arguments and vsrc.
  • net: (mandatory) is the name of the net to analyze, power or ground net name.
  • enable_em: (optional) is the flag to report current per power grid segment.
  • outfile: (optional) filename specified per-instance voltage written into file.
  • em_outfile: (optional) filename to write out the per segment current values into a file, can be specified only if enable_em is flag exists.
  • voltage: (optional) Sets the voltage on a specific net. If this command is not run, the voltage value is obtained from operating conditions in the liberty.
  • node_density: (optional) This value can be specfied by the user in um to determine the node density on the std. cell rails. Cannot be used together with node_density_factor.
  • node_density_factor: (optional) Integer value factor which is multiplied by standard cell height to determine the node density on the std. cell rails. Cannot be used together with node_density. Default value is 5.

Example scripts

See the file test/Vsrc_aes_vdd.loc for an example with a description specified here.

Regression tests

Limitations

FAQs

Check out GitHub discussion about this tool.

Cite this Work

If you find PDNSim useful, please use the following bibtex to cite it:

@misc{pdnsim,
author = "V. A. Chhabria and S. S. Sapatnekar",
title={{PDNSim}},
note= "\url{https://github.com/The-OpenROAD-Project/OpenROAD/tree/master/src/PDNSim}"
}

License

BSD 3-Clause License. See LICENSE file.