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CDCE62005无法锁定

Other Parts Discussed in Thread: CDCE62005

您好!

         板子上用到了3个CDCE62005,其中两个一直能稳定工作,第三个输出无法锁定,pll_lock一直是脉冲波形,输入AUX_in  25M,输出只有了第5路,125M,配置参数如下:          

cdce62005_cfg_data[0] <=32'h68860320; 
cdce62005_cfg_data[1] <=32'h68060301;
cdce62005_cfg_data[2] <=32'h68040302;
cdce62005_cfg_data[3] <=32'h68040303;
cdce62005_cfg_data[4] <=32'hE9040314;
cdce62005_cfg_data[5] <=32'h10000BF5;
cdce62005_cfg_data[6] <=32'h04BE03E6;
cdce62005_cfg_data[7] <=32'hFD0037F7;
cdce62005_cfg_data[8] <=32'h80BE03E6;
cdce62005_cfg_data[9] <=32'h84BE03E6;
cdce62005_cfg_data[10] <=32'h20008D98;
cdce62005_cfg_data[11] <=32'h20009D98;

但是如果把输出改成156.25或者别的频率(我试过几个)就能锁定。请问这个125M有什么特殊的吗?

在125M的时候VCO是2000,是不是因为这个太高了?或者需要设置什么地方?求指点,谢谢!