7段数码管译码器和8421码十进制计数器的程序-7 segment digital tube, and 8421 yards decimal decoder program counter

用VHDL语言实现8421码的十进制计数器，状态变化0000->0001->0010->0011->0100->0101->0110->0111->1000->0000.循环往复。 -VHDL language with 8421 yards of the decimal counter, a state of change 0000-> 0001-> 0010-> 0011-> 0100-> 0101-&g

1.8421码十进制计数器 2.分频系数为8，占空比为0.5的分频器 3.控制8个二极管的电路-Counter 2 decimal 1.8421 yards. Sub-frequency coefficient of 8, duty cycle of the divider 3 for the 0.5. 8 diode control circuit

1.7段数码译码器 2.4人表决器 3.8421码十进制计数器 4.9秒减计数器-1.7 Section 2.4 digital decoder person voting 3.8421 yards in 4.9 seconds by a decimal counter counter