Summary

And in Conclusion$\dots$

• Use muxes to select among input
  • S input bits selects 2{sup}S inputs
  • Each input can be n-bits wide, indep of S
  • Can implement muxes hierarchically
• ALU can be implemented using a mux
  • Coupled with basic block elements
• N-bit adder-subtractor done using N 1-bit adders with XOR gates on input
  • XOR serves as conditional inverter

Additional References

These notes would not be possible without Professor John Wawrzynek’s CS 61C handouts:

• Blocks Handout