Mach64_GetPLLReg
uint8 ioValue = Mach64_GetPLLReg(PLL_XCLK_CNTL);
uint8 vclkCntl = Mach64_GetPLLReg(PLL_VCLK_CNTL);
uint8 tmp = Mach64_GetPLLReg(PLL_VCLK_POST_DIV);
tmp = Mach64_GetPLLReg(PLL_XCLK_CNTL);
uint8 mClkFeedbackDivider = Mach64_GetPLLReg(PLL_MCLK_FB_DIV);