Chapter 5
System Configuration
VME-MXI-2 User Manual
5-44
© National Instruments Corporation
Mainframe #2 (40 to 5F), MXIbus Device A (64 to 67), and
MXIbus Device B (68). Enables the logical address window of
the VME-MXI-2 at logical address 0 with an outward range of
40 to 7F by writing the value 4240 hex to the Logical Address
Window Register (Base/Size format).
11. Enables the logical address window of the VME-MXI-2 found at
logical address 1 for the entire outward mapping range of 0 to FF.
Scans all logical addresses, skipping all previously encountered
devices, and finds the VME-MXI-2 in VMEbus Mainframe #6.
12. Enables the logical address window of the VME-MXI-2 in
VMEbus Mainframe #6 for the entire inward mapping range of
0 to FF. Scans all logical addresses, skipping all previously
encountered devices and defined ranges. No more VME-MXI-2
interfaces are found. Because VMEbus Mainframe #6 has no
VXIbus devices, the logical address window does not need to be
programmed.
13. Sets the logical address window of the VME-MXI-2 found in
VMEbus Mainframe #1 at logical address 1 to cover the devices
connected to that extender: the VME-MXI-2 in VMEbus
Mainframe #6 (2). Enables the logical address window of the
VME-MXI-2 at logical address 1 with an outward range of 2 to
3 by writing the value 4702 hex to the Logical Address Window
Register (Base/Size format).
Configuring the A24 and A32 Addressing Windows
After the logical address space is configured for the system, the
multiframe RM configures the A16, A24, and A32 address space. The
logical address configuration forms a tree topology. Starting at the
bottom of the tree and working up, add up the amount of memory
needed by each mainframe and the devices on levels below it. That
amount is then rounded up to the next power of two if the Base/Size
format is used.
Starting at the root mainframe and working down each branch of the
tree, assign memory starting with the largest memory window
requirements at the top of the memory space, descending in order of
window size and address location.
Each mainframe’s A16, A24, and A32 address ranges define the
address space occupied by the devices in that mainframe and on levels
below that mainframe. These address ranges cannot overlap the defined
range of any other mainframe unless that mainframe is on a level below
the mainframe.
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