PLL36XX_SDIV_MASK
sdiv = (pll_con0 >> PLL36XX_SDIV_SHIFT) & PLL36XX_SDIV_MASK;
pll_con0 &= ~(PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT);
(PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT));