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Onboard DRAM
Note
After installing DRAM on the VME-MXI-2, you need to enable the memory
through Measurement and Automation Explorer (MAX).
Bank 0
—
256 K × 32 or
256 K × 36
256 K × 32 or
256 K × 36
© National Instruments Corporation
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.
S2
a. 4 M × 32 and Larger
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.
Table 7-1. VME-MXI-2 DRAM Configurations
Bank 1
Total DRAM
—
—
256 K × 32 or
256 K × 36
Chapter 7
VME-MXI-2 Configuration and Installation
Figure 7-5. SIMM Size Configuration
National
Instruments
Option
0
1 MB
2 MB
7-7
S2
b. Smaller than 4 M × 32
Switch Setting
of S6
—
—
—
ON
—
ON
MXI-2 Configuration Reference Manual
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