Introduction - If you have any usage issues, please Google them yourself
Using VHDL language to design and implement a circuit, its function is 8 digital display digital 0-7. The first is the digital tube 0 display 0, other digital tube does not show; then digital tube 1 display 1, other digital tube does not show; and so on, digital tube 7 display after the display digital tube 0, so cycle. (hint: 0-7 cycles can be used 8 binary counter clock signal of the 1Hz count, the counter output to BCD to seven digital tube decoder, driven by digital display the corresponding number.)