TMS320F28377S - configure 50 MHz frequency

I am trying to configure system clock frequency to 50MHz for the TMS320F28377S controller. But it is not come out from the below while loop.

but it is working for 60 MHz frequency.

if i change to software library 1.0.0.0 version, does not have slip bit check. So it is come out from InitSysPll, but USB device is not recognized.

50MHz PLL configuration.

InitSysPll(XTAL_OSC,IMULT_10,FMULT_0,PLLCLK_BY_4);
InitAuxPll(XTAL_OSC,IMULT_10,FMULT_0,PLLCLK_BY_4);

function : void InitSysPll(Uint16 clock_source, Uint16 imult, Uint16 fmult, Uint16 divsel)

//
// Stop timers if either timer1 or timer2 counters overflow
//
while((CpuTimer2Regs.TCR.bit.TIF == 0) && (CpuTimer2Regs.TCR.bit.TIF == 0));

Is there any problem with 50MHz clock configuration.

Thanks in advance.