Digital-Soc-Design

Day 1

The LAB for day 1 gives the complete flow about using the SKYWATER 130nm PDK, Openlane EDA

Open the working Directory

  cd Desktop
  cd work/tools
  cd openlane_working_dir
  cd openlane

To open the Openlane

After getting into the directory, enter the commands

  docker
  pwd
  ls -ltr

To open the openlane in interactive mode,

 ./flow.tcl -interactive

To prepare the openlane,

  package require openlane 0.9
  prep - design picorv32a

Synthesis

To run the Synthesis

 run_synthesis

-> After Synthesis is completed, the message is shown that the "Synthesis was successful"

-> This contains all the details about the synthesis of the picorv32a

• The Chip Area of the module 147712.918400

• Number of cells: 14876

• Number of FF: 1613

-> Particularly we are interested in finding the Flop ratio. This can be calculated by using the formula:

         Flop ratio in (%) = Total No of D-FF
                           --------------------  X 100
                            Total No of Cells

                          = 1613
                          --------   X 100
                            14876 

                          = 10.8429685

Synthesis Report

The Synthesis Report are found in the directory

   ~/Desktop/work/tools/openlane_working_dir/openlane/designs/picorv32a/runs/29-03_15-37/reports/synthesis/1-yosys_4.stat.rpt

The synthesis Results are found in the directory

   ~/Desktop/work/tools/openlane_working_dir/openlane/designs/picorv32a/runs/29-03_15-37/results/synthesis/picorv32a.synthesis.v

Day 2

Floorplanning

The LAB for day 2 gives the complete flow of the Floorplanning and the placement process

After the Synthesis process, type the command for running the Floor planning

The configuration files are inside the location

  /Desktop/work/tools/openlane_working_dir/openlane/configurations/README.md

To run floorplan

  run_floorplan

we will be getting a success message like this

In this particular location from the floorplan.def file, we can able to see the area of the chip

         1000 unit distance = 1 Micron

         Distance in micron = value
                            ----------
                               1000

        Die width in micron = 660685 
                             ---------
                               1000
                            
       Die height in micron =  671405 
                              ---------
                                1000

      Area of die in micron = 660.685*671.405 Square micron 

Open this directory to initiate the Magic Tool

Locate to this directory

  ~/Desktop/work/tools/openlane_working_dir/openlane/designs/picorv32a/runs/29-03_15-37/results/floorplan

 magic -T /home/vsduser/Desktop/work/tools/openlane_working_dir/pdks/sky130A/libs.tech/magic/sky130A.tech lef read ../../tmp/merged.lef def read picorv32a.floorplan.def &

• Floorplan def in Magic

• Horizontal metal layer

• Vertical metal layer

• Standard cells

Placement

To run the Placement, the command is

    run_placement

Commands to load placement def in magic

    magic -T /home/vsduser/Desktop/work/tools/openlane_working_dir/pdks/sky130A/libs.tech/magic/sky130A.tech lef read ../../tmp/merged.lef def read picorv32a.placement.def &

• Floorplan def in magic

• Standard cell placement