| 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. |
| a |
| Vaporware |
Refers to either hardware or software that exist
only in the minds of the people who are trying to sell them to
you. |
| a |
| 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]. |
| a |
| 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. |
| a |
| Via |
A hole filled or lined with a conducting material
which is used to link two or more conducting layers in a
substrate. |
| a |
| 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 |
