Chapter 5
System Configuration
VME-MXI-2 User Manual
5-2
© National Instruments Corporation
All MXIbus devices have address windows that connect them to the
MXIbus system address map. MXIbus devices can be assigned space
in any of four address spaces: A32, A24, A16, and VXIbus logical
address space. Upon initialization, all windows are turned off, isolating
all MXIbus devices from each other. The multiframe RM scans the
MXIbus links and VMEbus mainframes for devices that conform to the
VXIbus-defined register set and configures the window registers on
each MXIbus device in order to partition the MXIbus address space
among all devices. Most multiframe RMs allow the user to input
information about the addressing needs of their VMEbus devices that
do not conform to the VXIbus register set. This allows the RM to
configure the address mapping on the VME-MXI-2 module to include
the address space used by those devices.
Planning a VMEbus/MXIbus System Logical
Address Map
The VMEbus/MXIbus system integrator is the person who configures
all the VMEbus and MXIbus devices and connects the system together.
This chapter assumes that you are the system integrator.
Before you begin setting the logical addresses and base addresses of the
devices in your VMEbus/MXIbus system, you must determine the tree
configuration of your system. The two basic configurations are the
multiframe RM as an external PC with a MXIbus interface, as shown in
Figure 5-1, or the multiframe RM in a VMEbus mainframe, as shown
in Figure 5-2. The location of the multiframe RM constitutes the root of
the system tree. MXIbus links connected to the root of the tree form
levels of the tree. Notice that only one MXIbus link can be connected
on the first level below a root PC multiframe RM, while multiple
MXIbus links can be connected on the first level below a root VMEbus
mainframe.
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