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IRQ全称为Interrupt Request
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IRQ全称为Interrupt Request_PHP教程

Jul 12, 2016 am 08:58 AM
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IRQ全称为Interrupt Request

IRQ全称为Interrupt Request,即是“中断请求”的意思,IRQ的作用就是在我们所用的电脑中,执行硬件中断请求的动作,比如我们需要读取硬盘中的一段数据时,当数据读取完毕,硬盘就通过IRQ来通知系统,相应的数据已经写到指定的内存中了。在每台电脑的系统中,是由一个中断控制器8259或是8259A的芯片(现在此芯片大都集成到其它的芯片内)来控制系统中每个硬件的中断控制。目前共有16组IRQ,去掉其中用来作桥接的一组IRQ,实际上只有15组IRQ可供硬件调用。

这16组IRQ的主要用途如下表:
IRQ编号 设备名称 用途
IRQ0 Time 电脑系统计时器
IRQ1 KeyBoard 键盘
IRQ2 Redirect IRQ9 与IRQ9相接,MPU-401 MDI使用该IRQ
IRQ3 COM2 串口设备
IRQ4 COM1 串口设备
IRQ5 LPT2 建议声卡使用该IRQ
IRQ6 FDD 软驱传输控制用
IRQ7 LPT1 打印机传输控制用
IRQ8 CMOS Alert 即时时钟
IRQ9 Redirect IRQ2 与IRQ2相接;可设定给其它硬件使用
IRQ10 Reversed 建议保留给网卡使用该IRQ
IRQ11 Reversed 建议保留给AGP显卡使用
IRQ12 PS/2Mouse 接PS/2鼠标,若无也可设定给其他硬件使用
IRQ13 FPU 协处理器用,例如FPU(浮点运算器)
IRQ14 Primary IDE IDE0传输控制用
IRQ15 Secondary Ide IDE1传输控制用
IRQ 信息反馈 Information Repeat Request

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