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 Yuan, 2 Yuan and the coin of 5 Yuan. When total currency value is equal to the merchandise unit price of customer needs machine send the merchandise of needs, if is larger than , machine will remain currency except offering the merchandise needed to quit　Quit the coin of customer input if being smaller than , design it 1 Yuan and 2 Yuan seek 0 coins infinite.