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HPI读写DSP内部RAM,型号TMS320VC5416

我在手册上看到,HPI可以访问全部的RAM空间。但是我用HPI读写DSP内容DARAM,OX80~0X7FFF地址范围内能够进行正确的读写,超过0X8000读出错,PMST配置的0x7fa8,DROM=1,OVLY=1,MP/MC=0.请大家指点