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Development System Reference Guide www.xilinx.com 413
R
oscillator
An oscillator is a bi-stable circuit that can be used as a clock. The stable
states are 0 and 1.
P
package
A package is the physical packaging of a chip, for example, PG84,
VQ100, and PC48.
pad
A pad is the physical bonding pad on an integrated circuit. All signals
on a chip must enter and leave by way of a pad. Pads are connected to
package pins in order for signals to enter or leave an integrated circuit
package.
PAL
A PAL is a programmable logic device that consists of a
programmable AND matrix whose outputs drive fixed OR gates. This
was one of the earliest forms of programmable logic. PALs can
typically implement small functions easily (up to a hundred gates)
and run very fast, but they are inefficient for large functions.
Parallel Cable III
Parallel Cable III is a cable assembly which contains a buffer to protect
your PCs parallel port and a set of headers to connect to your target
system.
partial reconfiguration
Partial Reconfiguration refers to a portion of an FPGA design being
reconfigured while the remainder of the design is still operational.
Partition
A Partition is design unit placed on an instance in a design to enable
design preservation.
path
A path is a connected series of nets and logic elements. A path has a
start point and an end point that are different depending on the type
of path. The time taken for a signal to propagate through a path is
referred to as the path delay.
path delay
Path delay is the time it takes for a signal to propagate through a path.