C6678 SRIO reset function

I'm using the C6678 SRIO to communicate with Altera stritix IV，Program can run successfully after being loaded。

Well，I add a reset function in this program like this:

         srioRegs->RIO_PLM_EN = 0;

         while(srioRegs->RIO_GBL_EN_STAT&1);

         srioRegs->RIO_PLM_EN = 1;

         while(srioRegs->RIO_GBL_EN_STAT&1 == 0);

         srioRegs->PLM[0].RIO_PLM_SP_LONG_CS_TX1 = 0x2003F044;

After this reset program execute ,the SRIO will nolonger link up.

Any mistake did I make?