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DAC38J82 PLL



大家好:请教个问题

DACCLKP时钟脚输入为125M时钟,配置serdes_clk_sel = 1,serder_refclk_div=0,mpy=20X,lb==00,vrange=0,理论上pll_out=2.5G输出,但是实际读取config108寄存器的值时钟为000f,只是serdes_pll未锁定,不知道为什么?其中serdes_refclk要求在100M-800M范围,输出在1.5G-3.2G范围即可。

config108寄存器为write to clear,即只有写入才能清除,是否和这有关系?