数字电压表的实现，VHDL语言实现，AD采用TLC549，通过学习，了解AD采集过程,The realization of digital voltage meter, VHDL language, AD using TLC549, by learning to understand the acquisition process AD

TLC549的VHDL驱动源码 已测试通过的TLC549的驱动源码 有转换使能和转换完毕标志-TLC549 the VHDL source code has been test driving the driving source through the TLC549 has converted to energy and the conversion complete flag