National Instruments MXI-2 Reference Manual page 101

Glossary
address modifier
address space
address window
ANSI
arbitration
asynchronous
B
B
backplane
BERR*
binary
BIOS
block-mode transfer
MXI-2 Configuration Reference Manual
One of six signals in the VMEbus specification used by VMEbus masters
to indicate the address space in which a data transfer is to take place.
n
A set of 2 memory locations differentiated from other such sets in
VXI/VMEbus systems by six addressing lines known as address modifiers.
n is the number of address lines required to uniquely specify a byte location
in a given space. Valid numbers for n are 16, 24, and 32. In VME/VXI,
because there are six address modifiers, there are 64 possible address
spaces.
A portion of address space that can be accessed from the application
program.
American National Standards Institute
A process in which a potential bus master gains control over a particular
bus.
Not synchronized; not controlled by time signals.
Bytes
An assembly, typically a printed circuit board, with 96-pin connectors and
signal paths that bus the connector pins. A C-size VXIbus system has two
sets of bused connectors called J1 and J2. A D-size VXIbus system has
three sets of bused connectors called J1, J2, and J3.
Bus error signal
A numbering system with a base of 2.
Basic Input/Output System. BIOS functions are the fundamental level
of any PC or compatible computer. BIOS functions embody the basic
operations needed for successful use of the computer's hardware resources.
An uninterrupted transfer of data elements in which the master sources only
the first address at the beginning of the cycle. The slave is then responsible
for incrementing the address on subsequent transfers so that the next
element is transferred to or from the proper storage location. In VME, the
data transfer may have no more than 256 elements; MXI does not have this
restriction.
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