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LA Selection and Logical Address
Address Space and Requested Memory
Caution
If you install DRAM into the VXI/VME-MXI-2, do not attempt to use the first
4 KB of memory space. This 4 KB space maps to the registers on the VXI/VME-MXI-2
and does not access onboard DRAM. Accessing this region will cause your
VXI/VME-MXI-2 to behave incorrectly.
© National Instruments Corporation
After finding a VXI/VME-MXI-2, the VXI/VME-MXI-2 Configuration
Editor displays a menu you can use to modify its configuration settings.
The menu displays the current settings of the module. Notice that it also
shows the hardware revision and serial number of the VXI/VME-MXI-2.
You can set or modify the logical address of the VXI/VME-MXI-2 either
within the VXI/VME-MXI-2 Configuration Editor itself or with the
onboard 8-position DIP switch. To select the configuration method you
prefer, use the LA Selection options.
The default selection is the Switch option. Notice that the Logical Address
option is inaccessible, since it would have no effect. In this option you need
to change the hardware switch setting on the VXI/VME-MXI-2 itself if you
want to change the logical address.
If you select Software for this option, you can then use the Logical
Address option to select a logical address within the range of 1 to 254.
If you use this option, the hardware switch setting has no effect and you
must use the VXI/VME-MXI-2 Configuration Editor to change the
logical address.
The VXI/VME-MXI-2 requires at least 16 KB of address space in A24
space or at least 64 KB in A32 space. Use the Address Space option
to select whether you want to use A24 space or A32 space. Use the
Requested Memory option to set the amount of memory space that the
VXI/VME-MXI-2 will request. You can select up to 8 MB in A24 space
and up to 2 GB in A32 space. The default setting uses the minimum
requirement of 16 KB in A24 space.
These options are necessary if you change the amount of DRAM installed
on the VXI/VME-MXI-2. The amount of memory you set with the
Requested Memory option should match the amount of DRAM installed
on the VXI/VME-MXI-2. If no DRAM is installed, keep the default setting
of 16 KB. Notice that the smallest valid amount in A32 space is 64 KB.
Chapter 6
6-11
NI-VXI Configuration Utility
VXI/VME-PCI8026 for Linux
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