National Instruments 370551A-01 用户手册
Chapter 4
VME-MXI-2 Configuration and Installation
4-6
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Switch 4 has no effect when switch 3 is set for automatic MXIbus
termination; you must turn off automatic termination if you want to
manually control termination.
termination; you must turn off automatic termination if you want to
manually control termination.
Figure 4-4. MXIbus Termination
Configuration EEPROM
The VME-MXI-2 has an onboard EEPROM, which stores default register
values that are loaded at power-on. The EEPROM is divided into two
halves—a factory-configuration half, and a user-configuration half. Both
halves were factory configured with the same configuration values so you
can modify the user-configurable half, while the factory-configured half
stores a back-up of the default user settings.
values that are loaded at power-on. The EEPROM is divided into two
halves—a factory-configuration half, and a user-configuration half. Both
halves were factory configured with the same configuration values so you
can modify the user-configurable half, while the factory-configured half
stores a back-up of the default user settings.
Use switches 1 and 2 of the four-position switch at location U21 to control
the operation of the EEPROM. The Restore Factory Configuration switch
(switch 1) causes the VME-MXI-2 to boot off the factory-configured half
instead of the user-modified settings. This is useful in the event that the
the operation of the EEPROM. The Restore Factory Configuration switch
(switch 1) causes the VME-MXI-2 to boot off the factory-configured half
instead of the user-modified settings. This is useful in the event that the
a. Automatic MXIbus Termination (Default)
b. Terminate MXIbus (On)
c. Do Not Terminate MXIbus (Off)
U21
OFF
1
2
3
4
U21
OFF
1
2
3
4
U21
OFF
1
2
3
4