Verilog作业 ：自己写的源码输入，补码输出的，由状态机控制的四位加法器，为保证时序，加法器模块为超前近位加法器，包含测试台，通过 Modelsim 、Synplify仿真。-Verilog operation: the source code to write their own input, complementary code output by the state machine to control the four adder, in order to ensure timing