What configuration sequence using GPIO with XREADY pin?

I use 28335 with XINTF 512Kw RAM and also GPIO34/XREADY pin is used GPIO for aux power control pin with default pull down.

My code is:

// Make sure the XINTF clock is enabled

EALLOW;
SysCtrlRegs.PCLKCR3.bit.XINTFENCLK = 1;
EDIS;

// Configure the GPIO for XINTF with a 16-bit data bus
// This function is in DSP2833x_Xintf.c
InitXintf16Gpio();

EALLOW;
// All Zones---------------------------------
// Timing for all zones based on XTIMCLK = SYSCLKOUT
XintfRegs.XINTCNF2.bit.XTIMCLK = 0;
// Buffer up to 3 writes
XintfRegs.XINTCNF2.bit.WRBUFF = 3;
#if 0
// XCLKOUT is disabled
XintfRegs.XINTCNF2.bit.CLKOFF = 1; // Normal operation, disable it.
#else
// XCLKOUT is enabled
XintfRegs.XINTCNF2.bit.CLKOFF = 0; // for CLK Test
#endif
// XCLKOUT = XTIMCLK
XintfRegs.XINTCNF2.bit.CLKMODE = 0;

// Zone 7------------------------------------
// When using ready, ACTIVE must be 1 or greater
// Lead must always be 1 or greater
// Zone write timing
XintfRegs.XTIMING7.bit.XWRLEAD = 1;
XintfRegs.XTIMING7.bit.XWRACTIVE = 1;
XintfRegs.XTIMING7.bit.XWRTRAIL = 0;
// Zone read timing
XintfRegs.XTIMING7.bit.XRDLEAD = 1;
XintfRegs.XTIMING7.bit.XRDACTIVE = 1;
XintfRegs.XTIMING7.bit.XRDTRAIL = 0;

// don't double all Zone read/write lead/active/trail timing
XintfRegs.XTIMING7.bit.X2TIMING = 0;

// Zone will not sample XREADY signal
XintfRegs.XTIMING7.bit.USEREADY = 0;
//XintfRegs.XTIMING7.bit.READYMODE = 0;

// 1,1 = x16 data bus
// 0,1 = x32 data bus
// other values are reserved
XintfRegs.XTIMING7.bit.XSIZE = 3;
EDIS;

end of my code...

My board can not boot.

Let me know the correct XINTF configuration sequence.

Thanks in advance.

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