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vlsi Lecture06

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  • 1. Design and Implementation of VLSI Systems (EN1600) lecture06
  • 2. Computer-Aided Design (CAD) Tools • Early days were easy. The first IC-based microprocessor 4004 from Intel had only 2300 transistors (manufactured in 10 micron technology). Almost manual design. • Current chips has well about 1B transistors. To get the chip to market fast, CAD tools are needed.S. Reda EN160 SP’08
  • 3. A simple tool chain specifications Hardware if SEL == “00“ then Y elseif SEL == “01“ then Y = = A; B; elseif SEL == “10“ then Y = C; Description else end if; Y = D; Languages 2:1 MUX 2:1 MUX schematic entry D synthesis C 2:1 MUX B Y A SEL == 10 SEL == 01 SEL == 00 IC layout/ Layout and routing Cell library area simulation Verification and timing/ power resultsS. Reda EN160 SP’08
  • 4. Design Layout using Tanner L-EditS. Reda EN160 SP’08
  • 5. How to implement the layout for an inverter?S. Reda EN160 SP’08
  • 6. 1. First setup technology Use AMI 0.5μ submicron technology (λ=0.3μ)S. Reda EN160 SP’08
  • 7. Design rules are a bit different than book active polysilicon contacts metalS. Reda EN160 SP’08
  • 8. Adjust design in terms of lambdaS. Reda EN160 SP’08
  • 9. N well creationS. Reda EN160 SP’08
  • 10. Active regionS. Reda EN160 SP’08
  • 11. P-SelectS. Reda EN160 SP’08
  • 12. N-selectS. Reda EN160 SP’08
  • 13. Active well/substrate taps Had to adjust wellS. Reda EN160 SP’08
  • 14. Select for tapsS. Reda EN160 SP’08
  • 15. PolysiliconS. Reda EN160 SP’08
  • 16. Metal 1S. Reda EN160 SP’08
  • 17. Contacts (to active)S. Reda EN160 SP’08
  • 18. Contacts to polyS. Reda EN160 SP’08
  • 19. Contacts to polyS. Reda EN160 SP’08
  • 20. Piece of metal1 for input pinS. Reda EN160 SP’08
  • 21. Via1 from metal1 to metal2S. Reda EN160 SP’08
  • 22. Add little metal2 for output pinS. Reda EN160 SP’08
  • 23. Design Rule Checker (DRC) verifies that your layout does not violate any rules ignore density warnings if they show up errorS. Reda EN160 SP’08
  • 24. Design cosmetics Translate your design to the originS. Reda EN160 SP’08
  • 25. Label your inverter pins Make sure you are on the right layer When you label pin, you can select a region (not just point)S. Reda EN160 SP’08