User manual

Chapter 3 VXI-MXI-2 Configuration and Installation

Onboard DRAM

The VXI-MXI-2 can accommodate up to two 1.35 in. DRAM SIMMs.

Table 3-1 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

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 supports DRAM

speeds of 80 ns or faster.

Switch S6 is used to select the size of each SIMM. The SIMM sockets

and S6 are accessible only by removing the right side cover. To access

these components, remove the four screws on the top, the four screws

on the bottom, and the five screws on the right-side cover of the metal

enclosure. If the SIMMs are 4 M x 32 or larger, S6 should be in the

OFF setting as shown in Figure 3-11a. For SIMMs smaller than

4 M x 32, use the ON setting as shown in Figure 3-11b.

b. Smaller than 4 M x 32

SIMM SIZE

( = 4M x 32 AND

LARGER)

SIMM SIZE

( = 4M x 32 AND

LARGER)

a. 4 M x 32 and Larger

Figure 3-11. SIMM Size Configuration

Refer to Table 3-1 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, 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.