Chapter 5
System Configuration
VME-MXI-2 User Manual
5-26
© National Instruments Corporation
devices. VMEbus Mainframe #3 needs 4 KB of A16, in addition to
the amount of A16 required by MXIbus link #3 connected to it on
Level 2.
4.
Figure 5-23 is the worksheet for MXIbus #3, which includes
VMEbus Mainframes #4 and #5. Mainframe #4 needs 2 KB and
Mainframe #5 needs 1 KB of A16 space. We fill in the appropriate
spaces on the worksheet.
5.
Now we return to Figure 5-22 and fill in the MXIbus #3
information in the space for a second-level MXIbus link
connected to VMEbus Mainframe #3. MXIbus #3 needs 2 KB
for Mainframe #4 and 1 KB for Mainframe #5. The sum is 3 KB,
which rounds up to the next address break of 4 KB. The amount of
A16 space required for the window into VMEbus Mainframe #3 is
4 KB plus the 3 KB required by MXIbus #3, which rounds up to
the next address break of 8 KB. We enter all of these numbers into
the worksheet.
6.
We now fill in Figure 5-21 for MXIbus #1. MXIbus #1 requires
512 B for MXIbus Device A and 8 KB for VMEbus
Mainframe #3. The sum of these values rounds up to the nearest
address break of 16 KB. We record this information on the
worksheet.
7.
Figure 5-21 is now completed for MXIbus #2. The only device on
MXIbus #2 is VMEbus Mainframe #6, which needs 2 KB of A16
space. We enter this value into the worksheet.
8.
The total amount of A16 space required by the system is now
computed and found to be 34 KB, which rounds up to the next
address break of 48 KB. This number does not exceed the
maximum of 48 KB, so this configuration of A16 space is
acceptable.
9.
The next step is to determine the range of addresses, or base
address, size, and direction of the A16 window for each
VME-MXI-2 in the system. We first assign A16 space to the
VMEbus RM Mainframe. From Figure 5-21, we see it needs
16 KB of A16 space, so we assign it the bottom 16 KB of A16
space, addresses 0 through 3FFF hex. See Figure 5-20 for a
pictorial representation of this assignment.
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