Справочник Пользователя для National Instruments 370551A-01

© National Instruments Corporation

The VXI-MXI-2 has the following front panel features:

•

Three front panel LEDs

–

SYSFAIL LED indicates that the VMEbus SYSFAIL line is 
asserted.

–

MXI LED indicates when the VXI-MXI-2 is accessed from the 
MXIbus.

–

VXI LED indicates when the VXI-MXI-2 is accessed from the 
VXIbus.

•

MXIbus connector

•

Three SMB connectors

–

External clock

–

Trigger output

–

Trigger input

•

System reset pushbutton

The VXI-MXI-2 is housed in a metal enclosure to improve EMC 
performance and to provide easy handling. Because the enclosure includes 
cutouts to facilitate changes to the switch and jumper settings, it should not 
be necessary to remove it under normal circumstances.

However, it is necessary to remove the enclosure if you want to change 
the amount of DRAM installed on the VXI-MXI-2. Switch S6, which is 
directly related to the amount of DRAM you want to install, is also 
accessible only by removing the enclosure. If you will be making this 
change, remove the four screws on the top, the four screws on the bottom, 
and the five screws on the right side cover of the enclosure. Refer to the 

 section for details about changing DRAM.

Each device in a VXIbus/MXIbus system is assigned a unique number 
between 0 and 254. This 8-bit number, called the logical address, defines 
the base address for the VXI configuration registers located on the device. 
With unique logical addresses, each VXIbus device in the system is 
assigned 64 bytes of configuration space in the upper 16 KB of A16 space.