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Development System Reference Guide www.xilinx.com 407
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H
HDL
Hardware Description Language. A language that describes circuits in
textual code. The two most widely accepted HDLs are VHDL and
Veri log.
An HDL, or hardware description language, describes designs in a
technology-independent manner using a high level of abstraction. The
most common HDLs in use today are Verilog and VHDL.
hexadecimal
Hexadecimal is a numbering system with a base of 16 digits (0, 1, 2, 3,
4, 5, 6, 7, 8, 9, A, B, C, D, E, F)
hierarchical annotation
Hierarchical annotation is an advance method of running logical
annotation that requires three things: 1) .ncd file, 2) .ngm file, and 3)
KEEP_HIERARCHY constraint placed on explicit hierarchy blocks
prior to mapping. When this is done, the back-annotation guarantees
to preserve the user’s hierarchy.
hierarchical design
A hierarchical design is a design composed of multiple sheets at
different levels of your schematic.
hold time
Hold time is the time following a clock event during which the data
input to a latch or flip-flop must remain stable in order to guarantee
that the latched data is correct.
Hprep6
A program that takes an implemented CPLD design (VM6) file from
CPLDfit and generates a JEDEC (JED) programming file.
I
IBUF
An IBUF acts as a protection for the chip, shielding it from eventual
current overflows.
IC
Integrated Circuit (IC) is a single piece of silicon on which thousands
or millions of transistors are combined. ICs are the major building
blocks of modern electronic systems.