eda课程，包括数码管显示，可变步长计数器的编写-eda courses, including digital display, variable-step preparation of counter

找到的一个自动售货机的vhdl程序，关于eda的设计有没有最新的一些说明之类的饿-The vendor 1 of source code ． vendor can sell 3 kinds of merchandise: The Hamburg and 1 Yuan of hot dog wrap 2 Yuan and double-deck Hamburg 3 Yuan. It is infinite to set up quantity. 2 ． vendor promise input 1