User manual

Chapter 6 System Configuration
VXI-MXI-2 User Manual 6-44 © National Instruments Corporation
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.
System Administration and Initiation
System self-test administration, hierarchy configuration, and initiation
of normal operation are handled as defined in the VXIbus specification.
A general-purpose multiframe RM must wait five seconds before
testing the Passed condition of each device, because no prescribed
global mechanism is defined for monitoring all of the SYSFAIL signals
in the system.