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Glossary: V
Glossary: V
Vapor-Phase Soldering
A surface mount process in which a substrate carrying
components attached by solder paste is lowered into the vapor-cloud
of a tank containing boiling hydrocarbons. This melts the solder paste
thereby forming good electrical connections. However, vapor-phase soldering
is becoming increasingly less popular due to environmental concerns.
Vaporware
Refers to either hardware or software that exist only
in the minds of the people who are trying to sell them to you.
Vector Notation
A notation used in logic simulation and synthesis
in which a single name is used to reference a group of signals, and
individual signals within the group are referenced by means of an index;
for example, a[3:0] = a[3], a[2], a[1], and a[0].
Very-Large-Scale Integration (VLSI)
Refers to the number of logic gates in a device. By
one convention, very-large-scale integration represents a device containing
1,000 to 999,999 gates.
Via
A hole filled or lined with a conducting material
which is used to link two or more conducting layers in a substrate.
Virtual Hardware or Virtual Logic
An extension of dynamically configurable hardware
based on a new generation of FPGAs which were introduced around the
beginning of 1994. In addition to supporting the dynamic reconfiguration
of selected portions of the internal logic, these devices also feature:
no disruption to the device's inputs and outputs; no disruption to the
system-level clocking; the continued operation of any portions of the
device that are not undergoing reconfiguration; and no disruption to
the contents of internal registers during reconfiguration, even in the
area being reconfigured (see also Configurable Hardware, Reconfigurable
Hardware, Remotely Reconfigurable Hardware, and Dynamically Reconfigurable
Hardware).
Virtual Memory
A trick used by a computer's operating system to pretend
that it has access to more memory than is actually available. For example,
a program running on the computer may require ten mega-bytes to store
its data, but the computer may have only five mega-bytes of memory available.
To get around this problem, whenever the program attempts to access
a memory location that does not physically exist, the operating system
performs a slight-of-hand and exchanges some of the contents in the
memory with data on the hard disk.
VLSI (Very-Large-Scale Integration)
Refers to the number of logic gates in a device. By
one convention, very-large-scale integration represents a device containing
1,000 to 999,999 gates.
Volatile
Refers to a memory device which loses any data it
contains when power is removed from the system; for example, random-access
memory in the form of SRAM or DRAM
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