iverilog/tgt-vvp
Cary R 6f9ddea07f Keep parameters as a parameters reference for vpi calls.
For most cases just using the value of a parameter is fine, but
a vpi call can access more than the value so we want to use a
parameter reference instead of the value for vpi calls.

Strings were working correctly, integer values need some minor
code generator changes and real values needed to be pushed from
elaboration to the code generators. I also changed the default
real value comment from %g to %#g so that it is more obvious
that the value is a real value.
2009-01-16 18:21:50 -08:00
..
Makefile.in Keep source code version information in version files. 2009-01-05 21:43:21 -08:00
README.txt tgt-vvp generates code that skips nets as inputs. 2001-08-10 00:40:45 +00:00
draw_mux.c Content-free portability fixes. 2008-09-29 18:06:47 -07:00
draw_net_input.c Update copyright in files changed in 2009 2009-01-08 20:03:34 -08:00
draw_switch.c Content-free portability fixes. 2008-09-29 18:06:47 -07:00
draw_ufunc.c Content-free portability fixes. 2008-09-29 18:06:47 -07:00
draw_vpi.c Keep parameters as a parameters reference for vpi calls. 2009-01-16 18:21:50 -08:00
eval_bool.c Shadow reduction part 5 2008-12-18 16:42:55 -08:00
eval_expr.c Shadow reduction part 5 2008-12-18 16:42:55 -08:00
eval_real.c Keep parameters as a parameters reference for vpi calls. 2009-01-16 18:21:50 -08:00
modpath.c Content-free portability fixes. 2008-09-29 18:06:47 -07:00
vector.c Remove most of the lingering CVS droppings. 2008-12-05 21:48:28 -08:00
vvp-s.conf.in Remove redundant back-end selections. 2008-09-07 16:43:54 -07:00
vvp.c Update copyright in files changed in 2009 2009-01-08 20:03:34 -08:00
vvp.conf.in Remove redundant back-end selections. 2008-09-07 16:43:54 -07:00
vvp_config.h.in Remove most of the lingering CVS droppings. 2008-12-05 21:48:28 -08:00
vvp_priv.h Allow that sum immediate values can be signed. 2008-06-13 13:32:06 -07:00
vvp_process.c Add support for real/realtime arrays. 2008-11-01 20:44:03 -07:00
vvp_scope.c Keep parameters as a parameters reference for vpi calls. 2009-01-16 18:21:50 -08:00

README.txt

THE VVP TARGET

SYMBOL NAME CONVENTIONS

There are some naming conventions that the vp target uses for
generating symbol names.

* wires and regs

Nets and variables are named V_<full-name> where <full-name> is the
full hierarchical name of the signal.

* Logic devices

Logic devices (and, or, buf, bufz, etc.) are named L_<full_name>. In
this case the symbol is attached to a functor that is the output of
the logic device.


GENERAL FUNCTOR WEB STRUCTURE

The net of gates, signals and resolvers is formed from the input
design. The basic structure is wrapped around the nexus, which is
represented by the ivl_nexus_t.

Each nexus represents a resolved value. The input of the nexus is fed
by a single driver. If the nexus in the design has multiple drivers,
the drivers are first fed into a resolver (or a tree of resolvers) to
form a single output that is the nexus.

The nexus, then, feeds its output to the inputs of other gates, or to
the .net objects in the design.