Glossary
© National Instruments Corporation
Glossary-11
VME-MXI-2 User Manual
Resource Manager
A message-based Commander located at Logical Address 0,
which provides configuration management services such as
address map configuration, Commander and Servant mappings,
and self-test and diagnostic management.
response
A signal or interrupt generated by a device to notify another
device of an asynchronous event. Responses contain the
information in the Response register of a sender.
RM
See Resource Manager.
RMW
Read-Modify-Write cycle; a bus cycle in which data from a
single location is read, modified, and then written back.
ROAK
Release On Acknowledge; a type of VME interrupter which
always deasserts its interrupt line in response to an IACK cycle
on the VMEbus.
ROR
Release On Request; a type of VMEbus arbitration where the
current VMEbus master relinquishes control of the bus only
when another bus master requests the VMEbus.
S
s
seconds
Semi-Synchronous Protocol
A one-line, open-collector, multiple-device handshake trigger
protocol.
Servant
A device controlled by a Commander; there are message-based
and register-based Servants.
setting
To place a binary cell into the 1 state (non-zero).
Shared Memory Protocol
A communication protocol that uses a block of memory that is
accessible to both a client and a server. The memory block
operates as a message buffer for communications.
signal
Any communication between message-based devices consisting
of a write to a Signal register. Sending a signal requires that the
sending device have VMEbus master capability.
SIMM
Single In-line Memory Module
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