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LMX2820: LMX2820怎么实现扫频?

Part Number: LMX2820

我设置为双缓冲模式  用tics_pro控制的时候可以实现锁频,然后对小数寄存器写值,在写R0寄存器,发现频率发生了改变。但是当我将这些操作搬到fpga的时候,在没扫描的时候是能锁频的,一旦快速更新小数寄存器和R0寄存器的值以后,就会无法锁定频率,没有输出。  怎么搞?