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网口程序求解释



一个5509开发板,例程里有一个中断:
程序如下:

//External INT1(8019)中断,响应ICMP数据包
interrupt void int1()
{
              temp = RecFrame();
           if(temp)         DoNetworkStuff();
           page(0);
           delay(10);
           deminaddr = (int *)0x200007;
           *deminaddr = 0x00FF;
}

其中deminaddr = (int *)0x200007;           *deminaddr = 0x00FF;

这两句是什么意思?谢谢!

补充:我知道是往0x200007里写0xff,
我是想问这句话实现什么功能?如何跟网口联系起来?