User manual

Chapter 6 System Configuration
© National Instruments Corporation 6-5 VXI-MXI-2 User Manual
FF-F0
EF-E0
DF-D0
CF-C0
BF-B0
AF-A0
9F-90
8F-80
7F-70
6F-60
5F-50
3F-30
4F-40
2F-20
1F-10
0F-00
Size = 1
Size = 2
Size = 3
Size = 4
Size = 5 Size = 6
Size = 7
Size = 0
FEDCBA987654 3210
Figure 6-4. Address Range Allocation for Different Size Values
High/Low Configuration Format
Each address mapping window on a VXI-MXI-2 interface has High
and Low address parameters associated with it when the CMODE bit in
the VXI-MXI-2 Control Register (VMCR) is set. The High and Low
values define the range of MXIbus addresses that map into the VXIbus.
The High bits define the upper bound address of the window, and the
Low bits indicate the lower bound address of the window. To map a
range of addresses from the VXIbus to the MXIbus (out of the
mainframe), the RM places the upper bound of the window in the Low
field, and the lower bound of the window in the High field. The
window is disabled if the upper and lower bound are both equal to 0.
Warning: The High/Low configuration format is not defined in VXI-6, VXIbus
Mainframe Extender Specification. This format is a device-specific
feature of the VXI-MXI-2. Do not design a system architecture based
on this format when using a standard VXIbus Resource Manager.