文件包括分频、计数、伪双口ram读些和数码管显示，将50MHz的时钟分频为1Hz并计数，然后将结果存储在RAM中，然后读取计数结果并显示。-File divider, counting, pseudo-dual port ram read digital display, 50MHz clock frequency of 1Hz and count, then the result is stored in RAM, and then read the count results and dis