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Development System Reference Guide www.xilinx.com 415
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primitive
A basic logic element, such as a gate (AND, OR, XOR, NAND, or
NOR), inverter, flip-flop, or latch.
A logic element that directly corresponds, or maps, to one of these
basic elements.
programming
Programming is the process of configuring the programmable
interconnect in the FPGA.
PROM
A PROM is a programmable read-only memory.
PROM file
A PROM file consists of one or more BIT files (bitstreams) formed into
one or more datastreams. The file is formatted in one of three
industry-standard formats: Intel MCS86 HEX, Tektronics TEKHEX, or
Motorola EXORmacs. The PROM file includes headers that specify the
length of the bitstreams as well as all the framing and control
information necessary to configure the FPGAs. It can be used to
program one or more devices.
propagation
Propagation is the repetition of the bus attributes along a data path so
that they only need to be defined on one bus in a data path.
pull-down resistor
A pull-down resistor is a device or circuit used to reduce the output
impedance of a device, often a resistor network that holds a device or
circuit output at or less than the zero input level of a subsequent
digital device in a system.
pull-up resistor
A pull-up resistor is a device or method used to keep the output
voltage of a device at a high level, often a resistor network connected
to a positive supply voltage.
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RAM
Random Access Memory (RAM) is a read/write memory that has an
access time independent of the physical location of the data.
RAM can be used to change the address values (16
1
) of the function
generator it is a part of.