Advanced Circuits -- the assignment

Assignment 1: An Equality tester

Construct a circuit that takes two 3-bit inputs and tests them for equality: the circuit should output 1 if the two 3-bit inputs are identical and 0 otherwise. You may use any of the basic gates provided by the Logic Design Tool.

In the example on the right, the first three inputs are the first number and the second three are the second number. When the first three match, the second three, the output is 1. Your circuit should have the same input to output behavior as this ``black box'' circuit (a ``black box'' circuit is one for which the details of the design are hidden and only the inputs and outputs are shown):

Follow the directions on page 3 for saving your work.

Assignment 2: A Selector

The ``black box'' circuit on the right has four regular inputs (the bottom four) and two control inputs (the top two). Depending on the values of the top two, the output will be equivalent to one of the other inputs. For example, if you set the first two inputs to 0 and 1 respectively, then the output will be the same as the fourth input down (the second non-control input).

The two control inputs (the first two inputs in the circuit to the right, labelled C1 and C2 in the truth table below) determine which of the four other inputs is "selected" in the following way:

Construct an equivalent circuit using any of the basic gates provided by the Logic Design Tool. You may want to refer back to Exercise 3, in which you created a 2-input selector.

Follow the directions on page 3 for saving your work.