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03-内存介绍 #3

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HHuiHao opened this issue Apr 23, 2018 · 0 comments
Open

03-内存介绍 #3

HHuiHao opened this issue Apr 23, 2018 · 0 comments

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@HHuiHao
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HHuiHao commented Apr 23, 2018

03-内存介绍

  • 各类存储器的逻辑连接情况

  • 所有的内存单元都有唯一的地址，叫做物理地址

  • 各类存储器的物理地址情况

1.内存地址空间的大小受CPU地址总线宽度的限制。8086的地址总线宽度为20，可以定位2^20个不同的内存单元（内存地址范围0x00000-0xFFFFF），所以8086的内存空间大小为1MB
2.0x00000-0x9FFFF：主存储器。可读可写
3.0xA0000-0xBFFFF：向显存中写入数据，这些数据会被显卡输出到显示器。可读可写
4.0xC0000-0xFFFFF：存储各种硬件\系统信息。只读

  • 下图是各类存储器的逻辑连接-物理地址对应图
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