这是基于lattice fpga 做的spi slave模块。简单易懂，适合初学者。代码使用状态机描述。整个工程在diamond2.0版本编译运行。-This is based on lattice fpga do spi slave module. Easy to understand for beginners. The code using a state machine descr iption. The whole project is run diamond2.0 version o