docs/wiki/geda-icarus_glossary.html

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  13 <h1 id="icarusverilogglossary">Icarus Verilog Glossary</h1>
  14 <div class="level1">
  15 <pre class="code">Throughout Icarus Verilog descriptions and source code, I use a
  16 variety of terms and acronyms that might be specific to Icarus
  17 Verilog, have an Icarus Verilog specific meaning, or just aren&#039;t
  18 widely known. So here I define these terms.
  19
  20
  21 LRM     - Language Reference Manual
  22     This is a generic acronym, but in the Verilog world we sometimes
  23     mean *the* language reference manual, the IEEE1364 standard.
  24
  25
  26 PLI     - Programming Language Interface
  27     This is a C API into Verilog simulators that is defined by the
  28     IEEE1364. There are two major interfaces, sometimes called PLI 1
  29     and PLI 2. PLI 2 is also often called VPI.
  30
  31
  32 UDP     - User Defined Primitive
  33     These are objects that Verilog programmers define with the
  34     &quot;primitive&quot; keyword. They are truth-table based devices. The
  35     syntax for defining them is described in the LRM.
  36
  37
  38 VPI     -
  39     This is the C API that is defined by the Verilog standard, and
  40     that Icarus Verilog partially implements. See also PLI.
  41
  42
  43 VVM     - Verilog Virtual Machine
  44     This is the Icarus Verilog runtime that works with the code
  45     generator that generates C++.
  46
  47
  48 VVP     - Verilog Virtual Processor
  49     This is the Icarus Verilog runtime that reads in custom code in a
  50     form that I call &quot;VVP Assembly&quot;. See the vvp/ directory for
  51     documentation on that.
  52 </pre>
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