User manual

Chapter 4 VXI-MXI-2/B Configuration and Installation
VXI-MXI-2 User Manual 4-16 © National Instruments Corporation
Onboard DRAM
The VXI-MXI-2/B can accommodate up to two 1.35 in. DRAM
SIMMs. Table 4-1 lists the SIMMS you can use. You can use 32-bit
or 36-bit SIMMS since DRAM parity is not required. Because the
VXI-MXI-2/B supports only one organization at a time, all SIMMs
installed must be of the same type. Use Bank 0 first when installing the
SIMMs. This allows you to install up to 64 MB. The VXI-MXI-2/B
supports DRAM speeds of 80 ns or faster.
Switch S2 is used to select the size of each SIMM. If the SIMMs are
4 M x 32 or larger, S2 should be in the OFF setting as shown in
Figure 4-11a. For SIMMs smaller than 4 M x 32, use the ON setting as
shown in Figure 4-11b.
a. 4 M x 32 and Larger
b. Smaller than 4 M x 32
S2 S2
Figure 4-11. SIMM Size Configuration
Refer to Table 4-1 for how to adjust the switch (ON or OFF) for all
supported DRAM configurations. Many of the DRAM options are
available from National Instruments.
After installing DRAM on the VXI-MXI-2/B, you need to change the
EEPROM settings to make the DRAM accessible. For information
on how to do this, refer to either Chapter 7, VXIplug&play for the
VXI-MXI-2, or Appendix B, Programmable Configurations.