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preliminary resolver documentation.

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steve 2001-05-08 23:58:43 +00:00
parent 2e12635494
commit b3c2ad0a65
1 changed files with 16 additions and 1 deletions
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vvp/README.txt
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@ -1,7 +1,7 @@
/* /*
* Copyright (c) 2001 Stephen Williams (steve@icarus.com) * Copyright (c) 2001 Stephen Williams (steve@icarus.com)
* *
* $Id: README.txt,v 1.23 2001/05/02 23:16:50 steve Exp $ * $Id: README.txt,v 1.24 2001/05/08 23:58:43 steve Exp $
*/ */
VVP SIMULATION ENGINE VVP SIMULATION ENGINE
@ -101,6 +101,10 @@ symbols, then the inputs are initialized to the specified bit value,
and if this causes the output to be something other then x, a and if this causes the output to be something other then x, a
propagation event is created to be executed at the start of run time. propagation event is created to be executed at the start of run time.
The strengths of inputs are ignored by functors, and the output has
fixed drive0 and drive1 strengths. So strength information is
typically lost as it passes through functors.
Almost all of the structural aspects of a simulation can be Almost all of the structural aspects of a simulation can be
represented by functors, which perform the very basic task of represented by functors, which perform the very basic task of
combining up to four inputs down to one output. combining up to four inputs down to one output.
@ -381,6 +385,17 @@ to trigger this event. Only one of the input events needs to trigger
to make this one go. to make this one go.
RESOLVER STATEMENTS:
Resolver statements are functors with 4 inputs, but their job is to
calculate a resolved output using strength resolution. The type of the
functor is used to select a specific resolution function.
<label> .resolv/tri <symbols_list>;
<label> .resolv/tri0 <symbols_list>;
<label> .resolv/tri1 <symbols_list>;
THREAD STATEMENTS: THREAD STATEMENTS:
Thread statements create the initial threads for a simulation. These Thread statements create the initial threads for a simulation. These