Glossary
VME-MXI-2 User Manual
Glossary-12
© National Instruments Corporation
slave
A functional part of a MXI/VXI/VMEbus device that detects
data transfer cycles initiated by a VMEbus master and responds
to the transfers when the address specifies one of the device’s
registers.
slave-mode operation
A device is in slave mode it if is responding to a bus cycle.
Slot 0 device
A device configured for installation in Slot 0 of a VXIbus
mainframe. This device is unique in the VXIbus system in that it
performs the VMEbus System Controller functions, including
clock sourcing and arbitration for data transfers across the
backplane. Installing such a device into any other slot can
damage the device, the VXIbus backplane, or both.
SMB
Sub-miniature BNC; a miniature connector for coaxial cable
connections.
soft reset
Occurs when the RESET bit in the VXIbus Control Register of
the VME-MXI-2 is set. A soft reset clears signals that are
asserted by bits in the configuration registers but does not clear
configuration information stored in the configuration registers.
Start/Stop Protocol
A one-line, multiple-device protocol, which can be sourced only
by the VXI Slot 0 device and sensed by any other device on the
VXI backplane.
statically configured device
A device whose logical address cannot be set through software;
that is, it is not dynamically configurable.
Status/ID
A value returned during an IACK cycle. In VME, usually an
8-bit value which is either a status/data value or a vector/ID
value used by the processor to determine the source. In VXI, a
16-bit value used as a data; the lower 8 bits form the VXI logical
address of the interrupting device and the upper 8 bits specify
the reason for interrupting.
supervisory access
One of the defined types of VMEbus data transfers; indicated by
certain address modifier codes.
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