Chapter 7
VME-MXI-2 Configuration and Installation
©
National Instruments Corporation
7-7
MXI-2 Configuration Reference Manual
Onboard DRAM
The VME-MXI-2 can accommodate up to two 1.35 in. 72-pin DRAM
SIMMs. Table 7-1 lists the SIMM types you can use. You can use 32- or
36-bit SIMMs because DRAM parity is not required. Because the
VME-MXI-2 supports only one organization at a time, all SIMMs installed
must be of the same type. Use Bank 0 first when installing the SIMMs, and
use Bank 1 when you need to install a second, matching SIMM. As shown
in Table 7-1, you can install up to 64 MB. The VME-MXI-2 supports
DRAM speeds of 80 ns or faster.
Use switch S2 to select the size of each SIMM. If the SIMMs are 4 M
×
32
or larger, set S2 to the OFF setting as shown in Figure 7-5a. For SIMMs
smaller
than 4 M
×
32, use the ON setting as shown in Figure 7-5b.
Figure 7-5.
SIMM Size Configuration
Refer to Table 7-1 for how to adjust the switch (ON or OFF) for all
supported DRAM configurations. Many of the DRAM options are
available from National Instruments.
Note
After installing DRAM on the VME-MXI-2, you need to enable the memory
through Measurement and Automation Explorer (MAX).
Table 7-1.
VME-MXI-2 DRAM Configurations
Bank 0
Bank 1
Total DRAM
National
Instruments
Option
Switch Setting
of S6
—
—
0
—
—
256 K
×
32 or
256 K
×
36
—
1 MB
—
ON
256 K
×
32 or
256 K
×
36
256 K
×
32 or
256 K
×
36
2 MB
—
ON
a. 4 M
×
32 and Larger
b. Smaller than 4 M
×
32
S2
S2