The thesis discusses on how to research and then design the LED video panel system, which is a typical product of computer digital video system, by using the PLD chip as the main control logic.

本论文讨论用PLD芯片作为主要控制逻辑来设计计算机数字视频系统的一个典型应用型产品——LED视频电子显示屏系统的研制方法。

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Finally, it detailed described the basic logic structure and function module design of the automatic test of the computer interlocking system, and makes a summary and outlook to the full text.

最后，详细地描述了铁路信号计算机联锁系统自动测试系统的基本逻辑结构及其功能模块设计，并对全文的研究工作进行了总结和展望。

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Now, many digital logic systems cannot do without computer aided design CAD, especially the VHDL Hardware Description Language.

数字逻辑系统的设计离不开计算机辅助设计CAD工具的帮助，尤其是VHDL硬件描述语言。

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