National Instruments 370551A-01 用户手册

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页码 139
Chapter 6
NI-VXI Configuration Utility
6-6
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Device Type
This field indicates the classification of the PCI-MXI-2. The default value 
is MBD, designating a message-based device. The following table shows 
the available options.
The device type affects only the contents of the Device Class field in the 
Device Type register. The functionality of the other registers does not 
change.
Address Space
This field indicates the addressing mode(s) of the device’s operational 
registers. The PCI-MXI-2 can be configured in one of three ways. The 
default addressing mode is for A16 space only. Your other options are 
A16/A24 and A16/A32. 
Notice that several other controls on the configuration editor panel are 
disabled when the addressing mode is A16, as shown in Figure 6-3. Only 
if you select A16/A24 or A16/A32 are the following controls relevant:
VXI Shared RAM Size
Shared RAM Pool
Advanced
Byte Swapping
Memory Select
Mapping
VXI/VME Shared Memory
The VXI Shared Memory group contains the controls to set the VXI and 
VME shared RAM size and the shared RAM pool. The Advanced button 
leads to additional options that configure the upper and lower half of the 
shared RAM area.
Classification
Setting
Extended Device
EXT
Message-Based Device
MBD
Register-Based Device
RBD