ABB机器人主计算机单元型号:DSQC639 3HAC041443-003
报价单位:厦门航拓电气有限公司
联系人:戴先生
手机:18006003561(微信同号)
座机:0592-5072089
***:565167042
PCI总线的主要性能
(1)总线时钟频率33.3MHz/66.6MHz。
(2)总线宽度32位/64位。
(3)!大数据传输率132MB/s(264MB/s)。
(4)支持64位寻址。
(5)适应5V和3.3V电源环境。
即插即用的实现
所谓即插即用,是指当板卡插入系统时,系统会自动对板卡所需资源进行分配,如基地址、中断号等,并自动寻找相应的驱动程序。而不象旧的ISA板卡,需要进行复杂的手动配置。
实际的实现远比说起来要复杂。在PCI板卡中,有一组寄存器,叫"配置空间"(Configuration Space),用来存放基地址与内存地址,以及中断等信息。
以内存地址为例。当上电时,板卡从ROM里读取固定的值放到寄存器中,对应内存的地方放置的是需要分配的内存字节数等信息。操作系统要跟据这个信息分配内存,并在分配成功后把相应的寄存器中填入内存的起始地址。这样就不!手工设置开关来分配内存或基地址了。对于中断的分配也与此类似。
中断共享的实现
ISA卡的一个重要局限在于中断是独占的,而我们知道计算机的中断号只有16个,系统又用掉了一些,这样当有多块ISA卡要用中断时就会有问题了。
PCI总线的中断共享由硬件与软件两部分组成。
硬件上,采用电平触发的办法:中断信号在系统一侧用电阻接高,而要产生中断的板卡上利用三!管的集电!将信号拉低。这样不管有几块板产生中断,中断信号都是低;而只有当所有板卡的中断都得到处理后,中断信号才会***高电平。
软件上,采用中断链的方法:假设系统启动时,发现板卡A用了中断7,就会将中断7对应的内存区指向A卡对应的中断服务程序入口ISR_A;然后系统发现板卡B也用中断7,这时就会将中断7对应的内存区指向ISR_B,同时将ISR_B的结束指向ISR_A。以此类推,就会形成一个中断链。而当有中断发生时,系统跳转到中断7对应的内存,也就是ISR_B。ISR_B就要检查是不是B卡的中断,如果是,要处理,并将板卡上的拉低电路放开;如果不是,则呼叫ISR_A。这样就完成了中断的共享。
通过以上讨论,我们不难看出,PCI总线有着!大的的优势。而近年来的市场情况也证实了这一点。
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