设计了一款基于Avalon总线的8051MCU IP核。它支持MCS-51指令集，优化内部的结构，通过采用流水线技术、指令映射技术、指令预取技术、微代码技术等极大的提高了IP核的工作速度，使IP核在100MHz时钟下，能够单周期执行一条指令。本设计使用Modelsim软件完成了功能仿真和时序仿真，并在以Altera 公司的Cyclone II FPGA芯片为核心的DE2开发板上完成了硬件验证。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000964s ]
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:0.070797s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001085s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001111s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004460s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000967s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003575s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016100s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001451s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 555516 [ RunTime:0.012567s ]
