Description: Use DIP switches to enter two four binary numbers, press the operation button to display the results led the operation. Expand 1. In the realization of the basic functions of the premise, to add a clear function. 2 . Replacing the display, the results with a digital tube display. 3. Consider the value of the overflow. If an overflow occurs, the digital display " E" .
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addersub4
.........\addersub4.v
.........\btn_shift.v