Chapter 7
VME-MXI-2 Configuration and Installation
MXI-2 Configuration Reference Manual
7-8
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Caution
If you install DRAM into the VME-MXI-2, do not attempt to use the first 4 KB
of memory space. This 4 KB space maps to the registers on the VME-MXI-2 and does not
access onboard DRAM. Accessing this region will cause your VME-MXI-2 to behave
incorrectly.
VME-MXI-2 Intermodule Signaling
If you install more than one VME-MXI-2 in a single VMEbus chassis,
you must select a user-defined pin for use by the VME-MXI-2. The
VME-MXI-2 modules use this signal to disable the bus timeout unit(s) on
the other VME-MXI-2 modules during VMEbus accesses that map to the
MXIbus. This is done because the MXIbus bus timeout unit should be the
512 K
×
32 or
512 K
×
36
—
2 MB
—
ON
512 K
×
32 or
512 K
×
36
512 K
×
32 or
512 K
×
36
4 MB
—
ON
1 M
×
32 or
1 M
×
36
—
4 MB
YES
ON
1 M
×
32 or
1 M
×
36
1 M
×
32 or
1 M
×
36
8 MB
—
ON
2 M
×
32 or
2 M
×
36
—
8 MB
YES
ON
2 M
×
32 or
2 M
×
36
2 M
×
32 or
2 M
×
36
16 MB
—
ON
4 M
×
32 or
4 M
×
36
—
16 MB
YES
OFF
4 M
×
32 or
4 M
×
36
4 M
×
32 or
4 M
×
36
32 MB
—
OFF
8 M
×
32 or
8 M
×
36
—
32 MB
YES
OFF
8 M
×
32 or
8 M
×
36
8 M
×
32 or
8 M
×
36
64 MB
YES
OFF
Table 7-1.
VME-MXI-2 DRAM Configurations (Continued)
Bank 0
Bank 1
Total DRAM
National
Instruments
Option
Switch Setting
of S6