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lvds芯片SN65LV1224BDB没有lock,同时也没有任何数据输出



hi 

我使用SN65LV1224BDB这个芯片时发现,lock信号一直是高电平,ROUT0到9也一直是0,我测量了REFCLK是40.0002MHz,供电电压测量为3.3V,PWRDN,REN都是3.3V,原理图如附件所示,麻烦能帮我分析下哪里出了问题,导致这个芯片不工作吗?