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Logisim CPU Project

Logisim CPU Project. Erty Seidel Spring Term 2011. Logisim. Logic Simulation Program http://ozark.hendrix.edu/~burch/logisim/ Cross-platform ( > Java 5) Recent Update Plugins and mods FOSS (GPL) [Demonstration]. CPU Project. About one month 60-100 Hours 5 Versions (1 rebuild)

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Logisim CPU Project

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  1. Logisim CPU Project Erty Seidel Spring Term 2011

  2. Logisim • Logic Simulation Program • http://ozark.hendrix.edu/~burch/logisim/ • Cross-platform ( > Java 5) • Recent Update • Plugins and mods • FOSS (GPL) • [Demonstration]

  3. CPU Project • About one month • 60-100 Hours • 5 Versions (1 rebuild) • Still in development • SVN repository • Probably should have been doing homework

  4. Running a Program • Consult MIPS instruction set • Write out binary code • Use windows calculator to convert to hex • Write to a text document • Load into I-mem and D-mem • Run!

  5. What Works? • [See Excel spreadsheet]

  6. Big Problems? • No support for I-format arithmetic • Registers cannot write and read at the same time • Multiplication / Division are weird when working with highest-order bit • No branching • No exceptions • No forwarding / hazard detection

  7. The CPU • [Demonstration]

  8. Lessons Learned • CPUs are serious business • Simple pipelining is easy, anything more is very difficult • MIPS instructions are a bit arbitrary • The carry-in for signed subtraction must be 1

  9. Thanks • Prof. Evans • Helped talk through problems • Jorge Seidel • Solved subtraction, mult/div issues

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