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Sec 01: Logisim

Sec 01: Logisim. Why Logisim?. Most real-world hardware design is done using a text-based hardware description language – VHDL, AHDL, etc. Schematics can be "compiled" into a text description Can use a simulator to test the circuit

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Sec 01: Logisim

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  1. Sec 01: Logisim

  2. Why Logisim? • Most real-world hardware design is done using a text-based hardware description language – VHDL, AHDL, etc. • Schematics can be "compiled" into a text description • Can use a simulator to test the circuit • Other back-end tools optimize, perform layout and wire routing, floorplan, etc. • Final spec is either downloaded onto a programmable device, or etched into silicon • We will be using Logisim for all hardware design • interactive, graphical schematic editor • educational use mainly (makes it user-friendly)

  3. VHDL Example: Signed Adder

  4. Why Logisim? • Most real-world hardware design is done using a text-based hardware description language – VHDL, AHDL, etc. • Schematics can be "compiled" into a text description • Can use a simulator to test the circuit • Other back-end tools optimize, perform layout and wire routing, floorplan, etc. • Final spec is either downloaded onto a programmable device, or etched into silicon • We will be using Logisim for all hardware design • interactive, graphical schematic editor • educational use mainly (makes it user-friendly)

  5. What are we going to talk about? • Using Logisim: • pins and subcircuits • probes for debugging • bundles/splitters (with labels!) • logging • test vectors • Example Circuits: 1-bit & 32-bit 2:1 Mux • Using Subcircuits: 2:1 Mux and Controller • Logging & Test Vectors • Logisim Don’ts

  6. Example Circuit: 1-bit 2:1 Mux S = P if R == 0 S = Q if R == 1

  7. Example Circuit: 32-bit 2:1 Mux

  8. Using Subcircuits:2:1 Mux and Controller S = Q if R == 010 S = P otherwise

  9. Logging & Test Vectors Test Vector Truth Table Log File

  10. Logisim Don’ts

  11. Logisim Don’ts

  12. Logisim Don’ts

  13. Logisim Don’ts

  14. Logisim Don’ts

  15. Logisim Don’ts

  16. Some more information • MIPS Assignments: • 32-bit ALU • 32-bit Processor • 32-bit Pipelined Processor • Webpage: http://www.cs.cornell.edu/courses/cs3410/2010sp/

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