This bit is set to one whenever the Base Address Register (BAR) is written.

This bit is set to one whenever the Base Address Register (BAR) is written.
This bit is set to one whenever the Base Address Register (BAR) is written.

This bit is set to one whenever the Base Address Register (BAR) is written.
每当基地址寄存器被写入时,这一位会被设置为1.
说明：
基址寄存器：寄存器BX称为基地址寄存器(Base Register),它可作为存储器指针来使用.它位于CPU中.如果学过编汇语言,这句话就好理解了.因为基址寄存器是专业术语,需要专业知识才能在计算机中看到它的存在,bit是计算机的位,值有0和1两种状态.