设计一个可以顺计时和倒计时的秒表。要求计时的范围为00.0S~99.9S，用三位数码管显示。用VHDL语言-Designed to be a cis-timing and countdown stopwatch. Required time ranges from 00.0S ~ 99.9S, with three digital tube display.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001056s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.063835s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001018s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001138s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001008s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003098s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000879s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003778s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014469s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001192s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 174020 [ RunTime:0.018389s ]
