COMP 273 Lecture Notes - Lecture 4: Combinational Logic, Logic Gate, Memory Address
27 Feb 2016
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The truth tables are de ned by input variables and output variables , and we have been thinking of them as evaluating logical expressions. Another way to think of a combinational circuit is as a. The outputs encode the value stored at the address. We say such a memory is read-only because the gates of the circuit are xed. For example, suppose the memory address is speci ed by the two input variables a1, a0, and the contents at each address are speci ed by the bits y2y1y0. 0 and here is the corresponding memory. (note that the address is not stored in the memory!) input output (address) (contents of memory) You now have to think of the input and output variables in a di erent way than you did before. Before, you thought of the input variables as having true or false values, and you did not associate any particular signi cance to their order.
