这外部SRAM , 我用的也是10NS的, ISSI IS61LV25616 - 10T 下面的配置用了几年了一直好好的, 最近老出问题, 不知怎么回事
XintfRegs.XTIMING6.bit.XWRLEAD = 1;//1
XintfRegs.XTIMING6.bit.XWRACTIVE = 1;
XintfRegs.XTIMING6.bit.XWRTRAIL = 1;
// Zone read timing
XintfRegs.XTIMING6.bit.XRDLEAD = 1;//1
XintfRegs.XTIMING6.bit.XRDACTIVE = 1;
XintfRegs.XTIMING6.bit.XRDTRAIL = 0;
// double all Zone read/write lead/active/trail timing
XintfRegs.XTIMING6.bit.X2TIMING = 0;
// Zone will sample XREADY signal
XintfRegs.XTIMING6.bit.USEREADY = 0;
XintfRegs.XTIMING6.bit.READYMODE = 0; // sample asynchronous
// Size must be 1,1 - other values are reserved
XintfRegs.XTIMING6.bit.XSIZE = 3;
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