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急,请问TI的DSP怎样控制TI的并行DAC(附型号和时序图)?

Other Parts Discussed in Thread: TMS320VC5509A, DAC904

DSP型号:TI的 TMS320VC5509A(DSP5509)
ADC型号:TI 的 DAC904(14位,时序图如图)
    时序很简单,但问题是需要15个GPIO口,而该DSP的GPIO口才有7个,请问怎样控制? 
    我想到的是,想办法把数据传到D0-D13(应该是数据总线吧?我是新手),然后时钟用一个GPIO口控制时钟。不知是否可行?
    HPI和EHPI还不会用……
    不知针对存储器设计的时序是否可行?
    谢谢您的回答!