Chapter 5
System Configuration
VME-MXI-2 User Manual
5-12
© National Instruments Corporation
9.
Determine the range of addresses that will be occupied by each
device in the first-level MXIbus links. Remember that the range of
addresses occupied by these devices must be within the range of
addresses assigned to the MXIbus link to which it is a member.
Start with the largest device in the MXIbus link.
In the example system, MXIbus #1 has four devices. The largest
one is VXIbus Mainframe #2, which requires 32 logical addresses
and is assigned the lowest available range of 32 within the
MXIbus #1 space—40 to 5F hex. The next largest device, VMEbus
Mainframe #3, needs four logical addresses. This device has a
second-level MXIbus link that needs two logical addresses, and the
mainframe needs two logical addresses for its own VME-MXI-2
modules. First, assign the devices in the mainframe to the lowest
available range within the allocated address range of MXIbus #1—
60 to 61 hex. Then assign MXIbus #3 the lowest available range of
size 2—62 to 63 hex. MXIbus Device A needs four logical
addresses and MXIbus Device B needs one logical address. They
are assigned 64 to 67, and 68, respectively.
10. Determine the range of logical addresses that will be occupied by
each second-level device and MXIbus link. Remember that the
range of logical addresses occupied by second-level devices must
be within the range of addresses assigned to the device one level
above it. Once the first-level MXIbus links have been allocated,
assign the MXIbus devices and second-level MXIbus links within
the corresponding first-level devices, starting with the largest
device.
In the example system, we assigned MXIbus #3 logical address
range 62 to 63 hex. MXIbus #3 has two devices: VMEbus
Mainframe #4 and VMEbus Mainframe #5. Each requires one
logical address; therefore, we assigned them address 62 hex and
63 hex, respectively.
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