说明：  本文件夹包含了16个VHDL 编程实例，仅供读者编程时学习参考。 一、四位可预置75MHz -BCD码（加/减）计数显示器（ADD-SUB）。 二、指示灯循环显示器（LED-CIRCLE) 三、七人表决器vote7 四、格雷码变换器graytobin 五、1位BCD码加法器bcdadder 六、四位全加器adder4 七、英语字母显示电路 alpher 八、74LS160计数器74ls160 九、可变步长加减计数器 multicount 十、可控脉冲发生器pluse 十一、正负脉宽数控调制信号发生器pluse width 十二、序列检测器string 十三、出租车计费器spend 十四、数字秒表selclk 十五、抢答器 first
(This folder contains 16 examples of VHDL programming, only for readers to learn programming reference. 1, 4 Preset 75MHz-BCD code (plus/minus) count display (ADD-SUB). Second, light cycle display (LED-CIRCLE) 3, seven voting machines vote7 4, Gray code converter graytobin 5, a BCD code adder bcdadder six, four full adder adder4 seven or eight English letter display circuit alpher , 74LS160 counter 74ls160 9, variable-step addition and subtraction counters multicount 10, controllable pulse generator pluse 11, positive and negative pulse width modulation signal generator pluse width of NC 12, sequence detector string 13, a taxi billing spend 14 devices, digital stopwatch selclk 15, Responder first)