NI-VXI Software Installation and Configuration
Chapter 3
VME-AT2000/NI-VXI MS-DOS Getting Started
3-14
© National Instruments Corporation
Table 3-2 describes the characteristics of the options available under the Bus Configuration
menu.
Table 3-2. Bus Configuration Characteristics
Characteristic
Description
Default Value
MXIbus System
Controller
A MXIbus link must have a single device that
is responsible for MXIbus interrupt and bus
arbitration as well as bus timeouts. This device
is referred to as the MXIbus System Controller
and is always the first device in the MXIbus
daisy-chain. The AT-MXI is always
designated as the MXIbus System Controller
when used in this kit and should not be
changed.
NO = Not MXIbus System Controller
YES = MXIbus System Controller
YES
MXIbus Fair Request
MXIbus fair requesters give all MXIbus
devices equal opportunity to become bus
masters and transfer data, regardless of their
position within the MXIbus daisy-chain.
MXIbus devices that are not fair requesters
have a fixed priority scheme characterized by
their relative position within the MXIbus
daisy-chain. Devices closest to the MXIbus
System Controller have the highest priority.
The default configuration programs the
AT-MXI to be an unfair requester and should
only be changed if additional MXIbus devices
are added to the system. Refer to the user
manual included with your additional MXIbus
devices for more information.
NO = Not a MXIbus Fair Requester
YES = MXIbus Fair Requester
NO
MXIbus Interrupt
Level
Indicates the interrupt level used by the MXI
IRQ to interrupt the processor. This value must
correspond to jumper settings on the AT-MXI
board; however, the NONE option can be
selected with any jumper settings. If the
NONE option is selected, the same interrupt
level as used for AT-MXI board interrupts is
used for this interrupt.
Range = 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15,
or NONE
NONE
