1 / 23

Routing of Analog Busses with Parasitic Symmetry

Routing of Analog Busses with Parasitic Symmetry. Lars Schreiner , Markus Olbrich, Erich Barke, Volker Meyer zu Bexten. Contents. Motivation Net Bundle Routing Trapezoid Methodology Results Conclusions/Future Work. Contents. Motivation Net Bundle Routing Trapezoid Methodology Results

Leo
Télécharger la présentation

Routing of Analog Busses with Parasitic Symmetry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Routing of Analog Busses with Parasitic Symmetry Lars Schreiner, Markus Olbrich, Erich Barke, Volker Meyer zu Bexten

  2. Contents • Motivation • Net Bundle Routing • Trapezoid Methodology • Results • Conclusions/Future Work Lars Schreiner: ISPD 2005

  3. Contents • Motivation • Net Bundle Routing • Trapezoid Methodology • Results • Conclusions/Future Work Lars Schreiner: ISPD 2005

  4. Motivation • Groups of wires (net bundles) have to be routed symmetrically • Symmetry = equal capacitive coupling and resistance for each wire • Automatic balancing of wire length • Automatic generation of shielding patterns • Automatic generation of slotted/split wires Lars Schreiner: ISPD 2005

  5. Example of a Net Bundle with Parasitic Symmetry Lars Schreiner: ISPD 2005

  6. Contents • Motivation • Net Bundle Routing • Trapezoid Methodology • Results • Conclusions/Future Work Lars Schreiner: ISPD 2005

  7. Steps of Net Bundle Routing 1 Calculation of virtual terminals and net order Path search for net bundle Routing of the net bundle to the terminals Calculation of wire length differences and adjustment area search Use of Module generator for wire implementation 2 3 4 Lars Schreiner: ISPD 2005

  8. Basic Procedure = Virtual Terminal T1a = Terminal T2a 1 2 3 4 T1b T2b Lars Schreiner: ISPD 2005

  9. Separation of Terminal/Net Bundle Routing • Nets are treated and routed together as bundles. • Technology independent module generators can be used. • Problem complexity is reduced. • Keeping symmetry is easier. Lars Schreiner: ISPD 2005

  10. 1 3 2 2 3 1 BUS-module from Module generator 3 2 1 virtual terminal terminal bundle Net Ordering During Path Search (1) • „False“ net order of the right terminal bundle • Consideration during path search necessary Lars Schreiner: ISPD 2005

  11. 1 3 2 2 3 1 3 2 1 Net Ordering During Path Search (2) Possible solution of example Lars Schreiner: ISPD 2005

  12. Contents • Motivation • Net Bundle Routing • Trapezoid Methodology • Results • Conclusions/Future Work Lars Schreiner: ISPD 2005

  13. -45° 0° T- and L-Structures of Trapezoid Methodology = = Generator call: BUS N=3 LENGTH=4e-5 WIDTH=5e-6 LAYER=2 BEVELSTART=45 BEVELEND=0 Lars Schreiner: ISPD 2005

  14. Benefits of Trapezoid Methodology • Universal use for many geometries • Lines, T- and L-structures are implemented by the same module generator • Technology information hidden in module generator • Router gets only necessary technology information • Shielding and Slotting are hidden in the generator • Easy maintainability and adaptation to new technologies Lars Schreiner: ISPD 2005

  15. Adjustment Modules • Shorter wires have to be stretched • Two cases: • Adjustment to the favorable site • Adjustment to the unfavorable site Problem: Bent or terminal connection Solution: Adjustment modules Lars Schreiner: ISPD 2005

  16. Examples of Adjustment Modules Lars Schreiner: ISPD 2005

  17. Benefits of Adjustment Modules • Wire length balancing is done by module generator. • Different net bundle modules are generated for balancing bents, asymmetries, etc. • Resistive differences are adjusted. • Capacitive balancing is possible. Lars Schreiner: ISPD 2005

  18. Contents • Motivation • Net Bundle Routing • Trapezoid Methodology • Results • Conclusions/Future Work Lars Schreiner: ISPD 2005

  19. Hand Made vs. Router Lars Schreiner: ISPD 2005

  20. Symmetric Coupling Consideration During Path Search Lars Schreiner: ISPD 2005

  21. Contents • Motivation • Net Bundle Routing • Trapezoid Methodology • Results • Conclusions/Future Work Lars Schreiner: ISPD 2005

  22. Conclusion • Routing of net bundles • Consideration of routing constraints • Parallel wires • Symmetric capacitive coupling • Wire length difference calculation • Symmetric terminal connection • Module generators • Trapezoid methodology • Adjustment modules Lars Schreiner: ISPD 2005

  23. Future Work • 45° Routing • Twisted wires • Inductances Lars Schreiner: ISPD 2005

More Related