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PROF. C. D. CANTRELL

MULTIPLEXORS

CMOS logic circuit simulations at the Technical University of Hamburg, Germany (requires a Java-aware browser)
Gate realization of a 2-to-1 multiplexor circuit with inputs labeled 0 and 1
  1. 0 selected, both inputs low
  2. 0 selected, input 0 high, input 1 low
  3. 0 selected, input 0 low, input 1 high
  4. 1 selected, input 0 high, input 1 low
  5. 1 selected, input 1 high, input 0 low
Gate realization of a 4-to-1 multiplexor circuit with inputs labeled 0, 1, 2 and 3 (as in Hennessy and Patterson, Chapter 3, Figs. 4.14 and 4.15). Note that to address 4 inputs, one needs two bits and therefore two control lines (labeled Ctrl 0 and Ctrl 1 here). For example, when Ctrl 1 is "on" and Ctrl 0 is "off", one is addressing input 2 = 10_two.
  1. 2 selected, input 2 low
  2. 2 selected, input 2 high
The above simulations use Arnaud Masson's Macintosh-based logic design and simulation program LogicSim. The shareware program Digital Simulator is a point-and-click schematic generator/logic simulator for Windows 95 or Windows 3.1. It's free to students and people who work for educational institutions.