看datasheet里有这样的叙述：
硬件复位时：This will reset the device such that all registers will be reinitialized to default values and the hardware configuration values will be re-latched into the device (similar to the power-up/reset operation).

软件复位时：The software reset will reset the device such that all registers will be reset to default values and the hardware configuration values will be maintained. Software driver code must wait 3 ?s following a software reset before allowing further serial MII operations with the DP83848C

区别在于the hardware configuration values will be re-latched 和the hardware configuration values will be maintained 。

首先我不太明白all registers和the hardware configuration values 的区别。然后maintain是保持，re-latched从字面上看是重新锁存？
为什么不把软件复位和硬件复位做成效果一样的呢？还是因为软件复位和硬件复位有本质的区别？