FIFO电路(first in，first out)，内部藏有１６ｂｉｔ×１６ｗｏｒｄ的Dual port RAM，依次读出已经写入的数据。因为不存在Address输入，所以请自行设计内藏的读写指针。由FIFO电路输出的EF信号(表示RAM内部的数据为空)和FF信号(表示RAM内部的数据为满)来表示RAM内部的状态，并且控制FIFO的输入信号WEN(写使能)和REN(读使能)。以及为了更好得控制FIFO电路，AEF(表示RAM内部的数据即将空)信号也同时输出。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001172s ]
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:0.077947s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000993s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001264s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000944s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003088s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000794s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003605s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015789s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001079s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 405200 [ RunTime:0.013404s ]
