E1000_FEXTNVM6_REQ_PLL_CLK
ew32(FEXTNVM6, fextnvm6 | E1000_FEXTNVM6_REQ_PLL_CLK);
fextnvm6 &= ~E1000_FEXTNVM6_REQ_PLL_CLK;
ew32(FEXTNVM6, fextnvm6 & ~E1000_FEXTNVM6_REQ_PLL_CLK);