User`s manual

What is the VXI-MXI
Module?
With the Agilent E1482B VXI-MXI mainframe extender module, multiple
E1401A/E1400B mainframes are integrated into a single VXIbus system.
The Agilent E1482 extends the VXI backplane from mainframe to
mainframe by converting VXIbus signals to and from the appropriate
MXIbus signals, and transmitting them over the MXIbus cables.
For detailed information on VXI-MXI extender module configuration, refer
to the Agilent E1482B VXI-MXI Bus Extender User’s Manual.
When E1482 VXI-MXI mainframe extender modules are part of your
system, the MXI modules must function as the Data Transfer Bus (DTB)
timer. This means the bus timer capability of the Command Module or
V/382 Controller must be disabled. This is done by setting the ’VME BTO
Disable’ switch (Command Module) or ’VXIbus Error Timer’ switch
(V/382). The bus timer capability of the V743 controller does not have to be
disabled. If you are using an EPC7 as system controller, the EPC7 must be a
non-slot 0 device and installed in a slot other than slot 0. This is described
in Procedure 3: Set Up the System for Multiple Mainframes.
What are the
VXI-MXI Logical
Address Windows
Each mainframe in a multiple-mainframe VXIbus system is allocated a
logical address window. The window is allocated by the resource manager
during the power-on sequence. The size and starting address of the logical
address window is determined by the logical addresses of the modules in
each mainframe. When setting the logical addresses of the modules, note the
following guidelines.
• The logical address of the VXI-MXI extender module in mainframe
1 should be set to 1, 2, 3, ... The logical addresses of the VXI-MXI
modules in the other mainframes should be set to values near the
starting address of that mainframe’s logical address window. For
example, if a mainframe’s logical address window is 128 to 159, set
the VXI-MXI extender module’s address to 129, 130, ... This allows
for a register-based module to be set to 128, and then be assigned a
secondary GPIB address (16) by the Command Module resource
manager.
• The logical address window size is set to a power of 2 (2, 4, 8,...).
The size is the number of logical addresses in the window. The
starting address is an integer multiple of the size. For example, to
allocate a window for 30 logical addresses, the resource manager
will set a window size of 32. Valid starting addresses are 0, 32, 64,
96, 128, 160, 192, or 224.
Incidentally, the logical address of the VXI-MXI extender module in
that mainframe should be set to 1, 33, 65, 97, ...
A-8 Terms and Definitions C-Size Configuration Guide