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408 www.xilinx.com Development System Reference Guide
R
IEEE
Institute of Electrical and Electronics Engineers.Pronounced I triple E.
IFD
IFD is an IOB flip-flop.
impedance
Impedance is the sum of all resistance and reactance of a circuit to the
flow of alternating current.
implementation
Implementation is the mapping, placement and routing of a design. A
phase in the design process during which the design is placed and
routed.
incremental design
Incremental design refers to the implementation and verification of a
small design change using a guide file.
indexes
Indexes are the left-most and right-most bits of a bus defining the bus
range and precision.
inertial delay
If the pulse width of a signal is smaller than the path delay (from an
input port to an output port) then an inertial delay does not propogate
the pulse event through to the output port. This is known as pulse
swallowing.
input
An input is the symbol port through which data is sourced.
input pad registers and latches
Input pad registers and latches are D-type registers located in the I/O
pad sections of the device. Input pad registers can be used instead of
macrocell resources.