Physical Limits of Computing Dr. Mike Frank CIS 6930, Sec Physical Limits of Computing Dr. Mike Frank CIS 6930, Sec. #3753X Spring 2002 Lecture #32 Reversible Architectures, cont.; Reversible Programming Langs. Mon., Apr. 1

Administrivia & Overview Don’t forget to keep up with homework! We are 10 out of 14 weeks into the course. You should have earned ~71 points by now. Course outline: Part I&II, Background, Fundamental Limits - done Part III, Future of Semiconductor Technology - done Part IV, Potential Future Computing Technologies - done Part V, Classical Reversible Computing Fri. 3/22: RevComp theory II: Emulating Irreversible Machines RevComp theory II: Bounds on Space-Time Overheads Mon. 3/25: RevComp scaling analysis I: Cost, energy, area-time. Wed. 3/27: RevComp scaling analysis II: Spacetime and time. Fri. 3/29: Reversible processor architectures. Mon. 4/1: Reversible programming languages. Wed. 4/3: Reversible algorithms. Part VI, Quantum Computing - starts Fri. 4/5 Part VII, Cosmological Limits, Wrap-Up First we presented the fundamental limits, because we need to keep these in mind as bounds on what any possible future computing technology is going to be able to do. Next, we will survey the future of semiconductor technology, because this has near-term importance and will help to ground our later studies on things like nanoelectronics, molecular electronics, and other alternative technologies, as well as our discussions of reversible semiconductor circuits in part V and some semiconductor-based approaches to quantum computing in Part VI.

Reversible von Neumann Architectures Cont.

Pendulum - packaged die photo