KEPCO TMA VXI-27 - Manual (Page 71)

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TMA VXI-27 101602
SERVANT: A device that is controlled by a commander. There are message based and register
based servants.
SIGNAL: Any communication between message based devices consisting of a write to a Signal
register.
SLOT: A slot is a position where a module can be inserted into an VXIbus backplane. Each slot
provides the 96 pin J connectors to interface with the board P connectors. It may have to pro-
vide one, two, or three connectors.
SYSTEM: A system consist of one or more mainframes that are connected, all sharing a com-
mon resource manager. Each device in a system has a unique Logical Address.
TOP LEVEL: A top level device has no commander; in the NORMAL OPERATION substate it
may oerate autonomously with respect to all other devices except a device involved in runtime
resource management. A device involved in runtime resource management retains the capabil-
ity of forcing a top level device into the CONFIGURE sub-state by sensing tthe End Normal
Operation or the Abort Normal Operation command to the top level device.
VXIbus INSTRUMENT: A VXIbus INSTRUMENT is defined to be a MESSAGE BASED
DEVICE which supports the VXIbus Instrument protocols.
VXIbus SUBSYSTEM: A VXIbus Subsystem consists of a central timing module referred to as
Slot 0 with up to 12 additional adjacent VXIbus modules.
WORD SERIAL: The simplest required communication protocol supported by Message Based
devices in the VXIbus system. It utilizes the A16 communication registers to transfer data using
a simple polling handshake method.