VHDL代码，一些课本的小程序。包含3线-8线译码器，4选1选择器，6层电梯，8线-3线编码器，8线-3线优先编码器，8选1，BCD-7段显示译码器真值表，半加器，摩尔状态机，数字频率计，数字时钟，序列检测器的设计，一般状态机等等。(VHDL code, some textbooks for small programs. Includes 3 -8 decoder, 4 1 selector, 6 elevator, line 8 Line 8 line -3 encoder, -3 priority encoder, 8 choose 1, BCD-7 segment display decoder truth table, half adder, Moore state machine, digital frequency meter, digital clock, sequence detector design, general state machine etc..)