Stats

  • Locked Locked
  • Replies 5
  • Subscribers 91
  • Views 14141
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

dbgAutoCellFunction and RC scale factors

archive

 Dear All,

I have two questions regarding Encounter v6.2:

1) I read somewhere that before starting to work on a design in Encounter I should do: set dbgAutoCellFunction 1

Does anyone know why is that? What does this function do?

2) Does anyone know where to find or how to calculate the Capacitance/Resistance Scale Factors that are needed for RC extraction? These are filled in the Avanced> RC Extraction tab of Design Import window.

 Thanks in advance,

 Alex

Parents

  • Hi Alex,

    For 1: I think this was an old or beta way to enable the footprintless flow (meaning, you don't have to specify the buffer/inverter/delay cell footprints - FE can automatically tell what these cells are). In 6.2, the way to do this is: set dbgGPSAutoCellFunction 1. This is covered in the Timing Optimization chapter of the User Guide, under the section "Enabling the Footprintless Flow".

    For 2: Look at the RC Extraction chapter in the User Guide. There is a section called "Correlating SPEF Files Using the Ostrich Utility". This is what you need to do to get the RC scale factors. Basically, you give Ostrich an FE SPEF and a signoff SPEF, and it calculates the factors for you.

    - Kari

Reply

  • Hi Alex,

    For 1: I think this was an old or beta way to enable the footprintless flow (meaning, you don't have to specify the buffer/inverter/delay cell footprints - FE can automatically tell what these cells are). In 6.2, the way to do this is: set dbgGPSAutoCellFunction 1. This is covered in the Timing Optimization chapter of the User Guide, under the section "Enabling the Footprintless Flow".

    For 2: Look at the RC Extraction chapter in the User Guide. There is a section called "Correlating SPEF Files Using the Ostrich Utility". This is what you need to do to get the RC scale factors. Basically, you give Ostrich an FE SPEF and a signoff SPEF, and it calculates the factors for you.

    - Kari

Children
No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.