OpenROAD

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OpenROAD-pdn

This utility aims to simplify the process of adding a power grid into a floorplan. The aim is to specify a small set of power grid policies to be applied to the design, such as layers to use, stripe width and spacing, then have the utility generate the actual metal straps. Grid policies can be defined over the stdcell area, and over areas occupied by macros.

Installation and Setup

This package runs as a utility within the openraod application.

Usage

From inside the openroad application, the Power Delivery Network Generation utility can be invoked as follows:

% pdngen <configuration_file> [-verbose]

All inputs and power grid policies are specified in a TCL format in the configuration file.

% pdngen PDN.cfg -verbose

Configuration File

For further information on the configuration file, and to review an example configuration see the following:

• PDN configuration help

• Sample configuration - PDN.cfg

• Sample grid configuration - grid_strategy-M1-M4-M7.cfg

Assumptions and Limitations

Currently the following assumptions are made:

1. The design is rectangular

2. The input floorplan includes the stdcell rows, placement of all macro blocks and IO pins.

3. The stdcells rows will be cut around macro placements

Table Of Contents

• OpenROAD-pdn
  • Installation and Setup
  • Usage
  • Configuration File
  • Assumptions and Limitations

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Elements of a configuration file