1、用 VHDL 语言的不同语句分别描述任务选择器，并通过编译仿真比较不同语 句描述的区别。 2、通过仿真下载并通过硬件验证实验结果。-1, different statements are described in VHDL language task selector, and distinguished by comparing different statements compiled simulation described. 2, and verify the results