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Throughout Icarus Verilog descriptions and source code, I use a
variety of terms and acronyms that might be specific to Icarus
Verilog, have an Icarus Verilog specific meaning, or just aren't
widely known. So here I define these terms.
LRM - Language Reference Manual
This is a generic acronym, but in the Verilog world we sometimes
mean *the* language reference manual, the IEEE1364 standard.
PLI - Programming Language Interface
This is a C API into Verilog simulators that is defined by the
IEEE1364. There are two major interfaces, sometimes called PLI 1
and PLI 2. PLI 2 is also often called VPI.
UDP - User Defined Primitive
These are objects that Verilog programmers define with the
"primitive" keyword. They are truth-table based devices. The
syntax for defining them is described in the LRM.
This is the C API that is defined by the Verilog standard, and
that Icarus Verilog partially implements. See also PLI.
VVM - Verilog Virtual Machine
This is the Icarus Verilog runtime that works with the code
generator that generates C++.
VVP - Verilog Virtual Processor
This is the Icarus Verilog runtime that reads in custom code in a
form that I call "VVP Assembly". See the vvp/ directory for
documentation on that.
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