将此文件解压缩，会得到一个"ip"目录，将此目录放入你的项目中，就可以在sopc中import到一个叫pwm的组建了。解压缩还会得到一个C语言文件，它是与硬件配合的Nios2_C代码 -Extract this file will get an " ip" directory into this directory in your project, you can import into the sopc in the formation of a called pwm.

超声波流量计的部分设计程序，此部分为控制芯片ACEX1K系列的EP1K50QC208-3中的代码，采用的是VHDL语言，里面包括LCD12864的读写代码、流量的处理等-Ultrasonic flowmeter in which the design process, this part of the control chip ACEX1K series EP1K50QC208-3 in the code, using the VHDL language, which includes LCD1

四位加法器的verilog实现，用VHDL语言，附tb.v。-Verilog achieve four adder, using VHDL language, with tb.v.