BeGAN Power Grid Benchmarks

This is a anonymous public repository which contains thousands of PDN benchmarks in the form of SPICE circuit netlist files for three different technologies:

• SkyWater130 HD
• FreePDK45 with Open Cell Library (NanGate 45nm)
• ASAP7

Contents

• real-circuit-benchmarks: These benchmarks are generated using current maps OpenROAD flow with PDN from the OpenROAD flow (regular) and OpeNPDN (irregular).
• BeGAN-circuit-benchmarks: These benchmarks current maps are generated using the GANs. The PDNs are generated by both the OpenROAD flow (uniform) and OpeNPDN (non-uniform).

Each benchmark folder contains the following data:

• BeGAN_*_current_map.csv.gz (matrix representation of the current values)
• BeGAN_*_reg_grid.sp.gz (SPICE netlist files for regular PDN)
• BeGAN_*_irreg_grid.sp.gz (SPICE netlist files for irregular PDN)
• BeGAN_*_voltage_map_regular.csv.gz (matrix representation of the IR drop across the chip for regular PDN)
• BeGAN_*_voltage_map_irregular.csv.gz (matrix representation of the IR drop across the chip for irregular PDN)

Each benchmark folder also contains image representation for the above data and histogram representation for the following:

• BeGAN_*_voltage_map_regular_hist.png (per-PDN node IR drop distributions for regular PDN)
• BeGAN_*_voltage_map_irregular_hist.png (per-PDN node IR drop distributions for irregular PDN)
• BeGAN_*_voltage_map_regular_cdf.png (per-PDN node cumulative IR drop distributions for regular PDN)
• BeGAN_*_voltage_map_irregular_cdf.png (per-PDN node cumulative IR drop distributions for irregular PDN)

Note that for ASAP7 technology we do not generate the irregular PDNs due to the small die areas of the benchmark.

Gallery

Sample images from both real circuit and BeGAN benchmarks displayed below for 45nm technology as an example.

Real benchmark current maps

Set1 (without macros)

Set2 (with macros)

BeGAN benchmark current images

Set1 (without macros)

Set2 (with macros)

Real benchmark IR drop heatmaps

Set1 (without macros)

Set2 (with macros)

BeGAN benchmark IR drop heatmaps

Set1 (without macros)

Set2 (with macros)

Benchmark description

We use a SPICE format for releasing out benchmarks. An example is listed below

R645 n1_108000_179200_1 n1_102600_179200_1 0.14
R646 n1_113400_179200_1 n1_113400_179200_3 4.23
I7 n1_113400_179200_1 0 4.24901e-08
V0 n1_81000_106230_7 0 1.1

The generic convention is: <electric component> <node1> <node2> <value>

The node is defined using the following convention: <netname>_<x-cordinate>_<y-cordinate>_<layer-idx> In the above example R645 is via since they share the same x and y coordinate but the layer changes.

Benchmark examples summary

The table below summarizes the components for randomly sampled BeGAN benchmarks for NanGate 45nm technology.

BeGAN id	#nodes	#resistors	#voltage sources	#current sources
1	18409	19903	4	15750
2	50924	55332	9	43472
3	455112	493695	64	391220
4	112546	122641	12	95934
5	178555	193018	24	153738
6	179730	195360	24	153738
7	82389	89254	12	70738

Cite

Please cite our paper if you use our benchmarks in your own work:

@inproceedings{BeGAN,
  title={BeGAN: Power Grid Benchmark Generation Using a Process-portable GAN-based Methodology},
  author={Chhabria, Vidya A. and Kunal, Kishor and Zabihi, Masoud and Sapatnekar, Sachin S.},
  booktitle={IEEE/ACM International Conference On Computer Aided Design (ICCAD)},
  year={2021},
  pages={1-8}
}