数字通信原理 曹志刚版的SPI总线硬件描述语言Verilog下的实现，含主模式和从模式的实现，经过仿真验证，可作为一个单独的模块使用--Digital Communication Principles of CAO Zhi-gang version of the SPI bus, under the Verilog hardware descr iption language implementation, including Master mode and slave mode of implementation, through the simulation can be used as a separate module--