XINTF - first time read or write Problem with F28335

Hello.

I designed custom board TMX320F28335. I have problem using XINTF.

I have an FPGA connected to the XINTF(ZONE7) and I am just accessing some FPGA registers.

when I do first write or read on the XINTF after a power cycle, sometimes my board is halted.

At this time, if not halt, it works very well.

so I make code for debug.

debug code sequence is as follows :

0. Disable Global Interrupt
1. Disable WatchDog
2. Init Pll
3. Init Peripheral Clocks with enabling XINTFENCLK
    {
        EALLOW;
        SysCtrlRegs.HISPCP.all = 0x0001;
        SysCtrlRegs.LOSPCP.all = 0x0002;
        SysCtrlRegs.PCLKCR3.bit.XINTFENCLK = 1;
        EDIS;
    }
4. Init GPIO
5. Init Xintf
    {
        EALLOW;
        XintfRegs.XINTCNF2.bit.XTIMCLK = 1;
        XintfRegs.XINTCNF2.bit.WRBUFF = 0;
        XintfRegs.XINTCNF2.bit.CLKOFF = 1;
        XintfRegs.XINTCNF2.bit.CLKMODE = 1;

        XintfRegs.XTIMING7.bit.X2TIMING= 1;
        XintfRegs.XTIMING7.bit.XWRLEAD = 3;
        XintfRegs.XTIMING7.bit.XWRACTIVE = 7;
        XintfRegs.XTIMING7.bit.XWRTRAIL = 3;

        XintfRegs.XTIMING7.bit.XRDLEAD = 3;
        XintfRegs.XTIMING7.bit.XRDACTIVE = 7;
        XintfRegs.XTIMING7.bit.XRDTRAIL = 3;

        XintfRegs.XTIMING7.bit.X2TIMING = 1;

        XintfRegs.XTIMING7.bit.USEREADY = 0;
        XintfRegs.XTIMING7.bit.READYMODE = 1;

        XintfRegs.XTIMING7.bit.XSIZE = 3;
        EDIS;
    }
6. Some delay
7. Debug LED1, LED2 OFF
8. read register from FPGA via XINTF(ZONE7) <= this point is problem!

    {
        if( (*(volatile Uint16 *)0x203300) %2 == 1) {
        Debug LED2 ON;
        }

   }

9. Debug LED1 ON
10. while(1);

=> when I turn on power for my custom board, sometimes I can't see light of LED1 and LED2.

Does anybody know this problem?
Thank you.

Best regards,

Lee.