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介绍了一种有线电视机项盒的信源发生方案。该方案采用可编程逻辑器件来完成计算机EISA总线输出数据的格式转换，从而提高数据输出速率，满足信源要求。而且，该方案采用了开放性的结构，可以通过软件修改来实现功能扩充。还详细叙述了采用VHDL来进行可编程逻辑器件的功能设计过程。
This paper introduces a source generating scheme of a cable TV box. The program uses programmable logic devices to complete the computer EISA bus output data format conversion, thereby increasing the data output rate to meet the source requirements. Moreover, the program uses an open structure that can be extended by software modifications. Also described in detail using VHDL for programmable logic device function design process.