National Instruments NI-VXI User Manual
Page 132
Glossary
© National Instruments Corporation
G-9
NI-VXI User Manual
M
MB
1,048,576 or 2
20
mapping
Establishing a range of address space for a one-to-one correspondence
between each address in the window and an address in VXIbus
memory.
master
A functional part of a MXI/VME/VXIbus device that initiates data
transfers on the backplane. A transfer can be either a read or a write.
megabyte
A million bytes.
Memory Class device
A VXIbus device that, in addition to configuration registers, has
memory in VME A24 or A32 space that is accessible through addresses
on the VME/VXI data transfer bus.
message-based device
An intelligent device that implements the defined VXIbus registers and
communication protocols. These devices are able to use Word Serial
Protocol to communicate with one another through communication
registers.
MODID
A set of 13 signal lines on the VXI backplane that VXI systems use to
identify which modules are located in which slots in the mainframe.
MQE
Multiple Query Error; a type of Word Serial Protocol error. If a
Commander sends two Word Serial queries to a Servant without
reading the response to the first query before sending the second query,
a MQE is generated.
multitasking
The ability of a computer to perform two or more functions
simultaneously without interference from one another. In operating
system terms, it is the ability of the operating system to execute
multiple applications/processes by time-sharing the available CPU
resources.
MXIbus
Multisystem eXtension Interface Bus; a high-performance
communication link that interconnects devices using round, flexible
cables.
ms
Milliseconds