IRQ全称为Interrupt Request_PHP教程
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 |

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