FPGA简易频率计

初学FPGA时编写的verilog代码，初学者可以看看，互相印证，大神路过就行

 属性            大小     日期    时间   名称
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     目录           0  2017-11-06 08:38  caiping\
     目录           0  2017-11-06 08:38  caiping\prj\
     文件        1280  2017-09-12 00:24  caiping\prj\caiping.qpf
     文件        3907  2017-09-12 00:24  caiping\prj\caiping.qsf
     文件        2085  2017-09-12 00:24  caiping\prj\caiping.qws
     文件         986  2017-09-12 00:24  caiping\prj\caiping_nativelink_simulation.rpt
     目录           0  2017-11-06 08:38  caiping\prj\db\
     文件        5888  2017-09-12 00:24  caiping\prj\db\caiping.（0）.cnf.cdb
     文件        2194  2017-09-12 00:24  caiping\prj\db\caiping.（0）.cnf.hdb
     文件          89  2017-09-12 00:24  caiping\prj\db\caiping.cbx.xml
     文件        5979  2017-09-12 00:24  caiping\prj\db\caiping.cmp.rdb
     文件         209  2017-09-12 00:24  caiping\prj\db\caiping.cmp_merge.kpt
     文件         140  2017-09-12 00:24  caiping\prj\db\caiping.db_info
     文件        4034  2017-09-12 00:24  caiping\prj\db\caiping.hier_info
     文件         443  2017-09-12 00:24  caiping\prj\db\caiping.hif
     文件         163  2017-09-12 00:24  caiping\prj\db\caiping.ipinfo
     文件         372  2017-09-12 00:24  caiping\prj\db\caiping.lpc.html
     文件         399  2017-09-12 00:24  caiping\prj\db\caiping.lpc.rdb
     文件        1060  2017-09-12 00:24  caiping\prj\db\caiping.lpc.txt
     文件         123  2017-09-12 00:24  caiping\prj\db\caiping.map.ammdb
     文件        1219  2017-09-12 00:24  caiping\prj\db\caiping.map.bpm
     文件        7463  2017-09-12 00:24  caiping\prj\db\caiping.map.cdb
     文件       13086  2017-09-12 00:24  caiping\prj\db\caiping.map.hdb
     文件         908  2017-09-12 00:24  caiping\prj\db\caiping.map.kpt
     文件           4  2017-09-12 00:24  caiping\prj\db\caiping.map.logdb
     文件       18073  2017-09-12 00:24  caiping\prj\db\caiping.map.qmsg
     文件        1310  2017-09-12 00:24  caiping\prj\db\caiping.map.rdb
     文件        2188  2017-09-12 00:24  caiping\prj\db\caiping.map_bb.cdb
     文件        9779  2017-09-12 00:24  caiping\prj\db\caiping.map_bb.hdb
     文件           4  2017-09-12 00:24  caiping\prj\db\caiping.map_bb.logdb
     文件         232  2017-09-12 00:24  caiping\prj\db\caiping.pplq.rdb
............此处省略64个文件信息