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420 www.xilinx.com Development System Reference Guide
R
TTL
TTL, or transistor-transistor logic, is a technology with specific
interchange (communication of digital signals) voltages and currents.
Other technologies include ECL, MOS, and CMOS. These types of
logic are used as criteria to classify digital integrated circuits.
U
unbonded
Unbonded describes an IOB used for internal logic only. This element
does not have an external package pin.
Unified Libraries
A set of logic macros and functions that are used to define the logic of
a design. The elements are compatible across families and schematic
and HDL editors.
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VCC pin
The VCC pin is Power (5 volts). It is the supply voltage.
verification
Verification is the process of reading back the configuration data of a
device and comparing it to the original design to ensure that all of the
design was correctly received by the device.
Verilog
Verilog is a commonly used Hardware Description Language (HDL)
that can be used to model a digital system at many levels of
abstraction ranging from the algorithmic level to the gate level. It is
IEEE standard 1364-1995. Verilog was originally developed by
Cadence Design Systems and is now maintained by OVI.
A Verilog file has a .v extension.