阅读:1218回复:3
9052之初级问题
小弟有几个关于9052的初级问题,还望各位大哥帮帮忙。
1.在计算机上电启动后,哪些部分(软件或硬件)设置过PCI的配置寄存器?具体到寄存器级,哪些配置寄存器被哪些部分设置过?因为我对配置寄存器的设置过程不太了解,所以有此一问。 2.Local configuration register can be mapped into memory space or I/O space,and fixed at 128 bytes or less than 128 bytes.Right? How can I set them less than 128 bytes? 3.In the databooks,\" NO SUPPORT\"means I needn\'t to care about the register bit.Right? 4.PCI expansion rom space is also mapped into Local address space,right? And what is the location? 5.In Interrupt control/status register: (1).The bit 2,Local interrupt status,can\'t be written,why? How can I know whether the PCI 9052 is in the interruption status during the operation? (2).无论是边沿触发,还是电平触发,中断都只能是高电平有效吗?Because in the description of bit 8,local interrupt 1 select enable,there is a NOTE pointing out :Operates only in high plarity mode.I don\'t know. 6.The direction of LLOCKo#?output? 7.The difference between PCI 9052 C mode and J mode lies in the use of LA[27:2].The cause of the difference is the MODE pin,Right? 希望各位大哥百忙之中回答小弟的几个初级问题,谢谢! |
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沙发#
发布于:2002-05-22 22:17
中断是高电平有效还是低电平有效,是可以配置的
模式的选择通过一个MODE管脚 你问的问题,在DATASHEET里面都有 既然你的外语不差,多啃啃就全明白了 |
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板凳#
发布于:2002-05-23 10:41
各位大哥,不好意思,初级问题太多了,不过我是真的想知道所列问题里第1与5题的答案。请各位大哥帮帮忙。
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地板#
发布于:2002-05-23 11:21
5.选择边沿触发时,必须选择高电平有效(即上升沿);选电平触发时,高低均可。
两个中断针的中断状态位是只读的。它和局部中断允许、pci中断允许同时有效时,产生中断。 |
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