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Glossary
© National Instruments Corporation
Glossary-5
VXI-MXI User Manual
Dynamically
A device that has its logical address assigned by the Resource Manager. A
Configured Device
VXI device initially responds at Logical Address 255 when its MODID
line is asserted. A MXIbus device responds at Logical Address 255 during
a priority select cycle. The Resource Manager subsequently assigns it a
new logical address, which the device responds to until powered down.
The VXI-MXI cannot be dynamically configured.
E
ECL
Emitter-Coupled Logic
EMI
electromagnetic interference
Extended Class
A class of VXIbus device defined for future expansion of the VXIbus
Device
specification. These devices have a subclass register within their
configuration space that defines the type of extended device. The
VXI-MXI is an extended class mainframe extender device.
F
Fair Requester
A MXIbus master that will not arbitrate for the MXIbus after releasing it
until it detects the bus request signal inactive. This ensures that all
requesting devices will be granted use of the bus.
FCC
Federal Communications Commission
G
GB
gigabytes of memory
GIN
Daisy-chain Grant In signal
GOUT
Daisy-chain Grant Out signal
GPIB
General Purpose Interface Bus; the industry standard IEEE 488 bus.
H
Hard Reset
Occurs when the mainframe is powered on and when the VMEbus
SYSRESET signal is active. A hard reset clears all the registers on the
VXI-MXI.
Hex
Hexadecimal; the numbering system with base 16, using the digits 0 to 9
and letters A to F.
Hz
hertz; cycles per second.