Does Boot Order Matter with MXI-3 For VXI Systems?Hardware: VXI/VME/MXI>>MXI Interfaces>>VXI-8340
Problem: I have a VXI-834x series controller that uses MXI-3 to connect to the PCI bus of my computer. Are there any considerations regarding the boot order? Solution: Yes, there is a specific boot order. The VXI-834x series uses MXI-3 technology to extend the PCI bus of a host computer to a VXI chassis transparently, so your host computer can function as an embedded CPU module. Because of this transparent PCI extension, it is important to maintain a strict power-on sequence when turning on VXI chassis in a VXI-834x system. For the system software to discover and configure a VXI-834x series controller, power on all VXI-834x chassis in the system before enabling power on the host computer. If any chassis is not present when the host computer initiates its boot process, the host computer may not configure that VXI controller. If a VXI system is absent when the system boots, the host must be rebooted to discover the missing VXI system. You can think of the MXI-3 cable as extending your PC's PCI bus to the remote VXI controller, so in order for any PCI based hardware to be recognized by the computer, it has to be connected to the computer and turned on first. This is requested in the PCI Spec. To power-cycle a VXI chassis without rebooting the host computer, you must explicitly tell the NI-VXI software to take theVXI-834x series system offline. There are two ways to place a VXI-834x series controller in the offline state. First, the VXI-834x series includes a Request Offline button on the front panel. Second, a Request Offline option is available in MAX by right-clicking on the VXI System icon under the Devices and Interfaces view. To bring a VXI-834x series controller back online, use the Go Online option in MAX by right-clicking on the VXI system icon under the Devices and Interfaces view. The ONLINE front panel LED turns on when the VXI-834x series is online. At this point, it is safe to access the VXI interface. Related Links: KnowledgeBase 3LNCD9IT: Can I Control Two VXI Chassis With One PCI-MXI-3 Card? Attachments:
Report Date: 07/22/2005 Last Updated: 05/16/2008 Document ID: 3NLECSIT |
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