J T AG 接口插座与DSP芯片的距离:为了保证JTAG信号不受干扰，需
要注意两者之间的距离不超过六英寸(15甲24厘米)，超过这个距离，就需要在中
间加缓冲芯片。本设计中使用了244作为缓冲芯片，但其原因不是由于器件之间
距离过长，而是考虑到仿真器工作在5V电压，DSP引脚为3.3V，为了电平兼容
性而进行的电压转换功能。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001075s ]
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:0.070426s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000968s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001134s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000932s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.002950s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000790s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003399s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014601s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001127s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 485843 [ RunTime:0.014521s ]
