Simulation of the 4-bit Adder

Simulate and test your 4-bit adder.

1.: Open the Logic Simulator.
2.: Add the input and output signals to the waveform viewer.
3.: Associate the inputs with keys on the keyboard, and initialize inputs to LOW.
4.: You can combine inputs A3, A2, A1, A0 into a bus for display on the viewer. Select these inputs in the viewer and use Signal $\to$ Bus $\to$ Combine. Repeat for B and SUM, Figure 23. Reverse the bit order to get it correct if necessary.

**Figure 23:** 4-bit adder waveforms.
$\begin{figure} \begin{center} \epsfig{file=images/addersim3.eps}\end{center}\end{figure}$

ANU Engineering - ENGN3213