Chanraksmey Ly. 04. Published on Feb 1. International Journal of Engineering Research and Applications IJERA is an open access online peer reviewed international journal that publishes research. FPGA PROTOTYPING BY VHDL EXAMPLES Xilinx SpartanTM3Version. Pong P. Chu Cleveland State University. WILEYINTERSCIENCE A JOHN WILEY SONS, INC., PUBLICATION. The interactive 4 to 1 Line Multiplexer digital logic circuit, with Boolean function and Truth Table. University Of Columbia New York Summer Programs. Addersubtractor is a digital circuit that can do both addition and subtraction signed, unsigned, 2s complement, with overflow. The circuit has a Mode switch that.