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6657 I2C NAND BOOT问题

ALLEN  您好:

在6657  i2c  boot上还有一个问题,就是评估板EVM上的6657核输入时钟也是100M,但是在boot的时候可以把bootmode[12:10]设置为001(I2C 地址0x51),而根据手册PLL设置部分应该设置为011,这个是什么原因呢,多谢