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  28 <h1><a name="icarus_verilog_glossary" id="icarus_verilog_glossary">Icarus Verilog Glossary</a></h1>
  29 <div class="level1">
  30 <pre class="code">Throughout Icarus Verilog descriptions and source code, I use a
  31 variety of terms and acronyms that might be specific to Icarus
  32 Verilog, have an Icarus Verilog specific meaning, or just aren&#039;t
  33 widely known. So here I define these terms.
  34
  35
  36 LRM     - Language Reference Manual
  37     This is a generic acronym, but in the Verilog world we sometimes
  38     mean *the* language reference manual, the IEEE1364 standard.
  39
  40
  41 PLI     - Programming Language Interface
  42     This is a C API into Verilog simulators that is defined by the
  43     IEEE1364. There are two major interfaces, sometimes called PLI 1
  44     and PLI 2. PLI 2 is also often called VPI.
  45
  46
  47 UDP     - User Defined Primitive
  48     These are objects that Verilog programmers define with the
  49     &quot;primitive&quot; keyword. They are truth-table based devices. The
  50     syntax for defining them is described in the LRM.
  51
  52
  53 VPI     -
  54     This is the C API that is defined by the Verilog standard, and
  55     that Icarus Verilog partially implements. See also PLI.
  56
  57
  58 VVM     - Verilog Virtual Machine
  59     This is the Icarus Verilog runtime that works with the code
  60     generator that generates C++.
  61
  62
  63 VVP     - Verilog Virtual Processor
  64     This is the Icarus Verilog runtime that reads in custom code in a
  65     form that I call &quot;VVP Assembly&quot;. See the vvp/ directory for
  66     documentation on that.
  67
  68 </pre>
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