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DSP TMS320F2812 如何控制 CPLD EPM3128A I/O口

如题,本人处在DSP入门阶段,资料上讲DSP可以通过总线控制CPLD 的I/O口,前提是知道要控制的I/O口的地址。我疑惑的是怎么知道地址?又是如何进行控制的。附件是原理图,比如我想控制LCD显示,但是LCD数据PIN没有和DSP相接,而是连接到CPLD EPM3128上。请帮忙释义一下。谢谢!

Protel Schematic.pdf