関連ワード:  4 bit adder subtractor code    4 bit adder subtractor verilog code    4 bit adder subtractor vhdl code    4 bit adder subtractor verilog code behavioral    4 bit adder subtractor verilog code testbench    4 bit adder subtractor verilog code structural    4 bit binary adder subtractor verilog code    4 bit parallel adder subtractor verilog code    4 bit full adder subtractor verilog code    4 bit ripple carry adder subtractor verilog code