iverilog/tgt-vvp
Stephen Williams 3927917133 Handle selects unsized literal values accounting for bit extension.
When selecting bits from unsized literals, we do not put a limit
on the size of the literal, so there is no top above which we
stop getting literal bits.
2010-03-06 16:21:10 -08:00
..
Makefile.in Add explicit dependencies on generated header files. 2009-12-07 16:29:37 -08:00
README.txt tgt-vvp generates code that skips nets as inputs. 2001-08-10 00:40:45 +00:00
draw_mux.c Fix delays in continuous assignment to support 64bit delays. 2009-11-26 18:28:19 -08:00
draw_net_input.c Add driver for the HiZ of open nets. 2009-10-15 21:19:19 -07:00
draw_switch.c Make control inputs to islands use .import records. 2009-10-11 16:51:06 -07:00
draw_ufunc.c Function arg. expressions need to use the expr. width and arg. width. 2009-12-18 13:55:02 -08:00
draw_vpi.c Fix for pr2922063. 2010-01-23 09:29:40 -08:00
eval_bool.c Add support for 64 bit delays in procedural non-blocking assignments. 2009-02-17 10:32:11 -08:00
eval_expr.c Handle selects unsized literal values accounting for bit extension. 2010-03-06 16:21:10 -08:00
eval_real.c Fix for pr2913404. 2009-12-21 09:59:12 -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 Unify the version stamp in the version_*.h header files. 2009-11-27 09:25:50 -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 Make control inputs to islands use .import records. 2009-10-11 16:51:06 -07:00
vvp_process.c Fix for pr2913404. 2009-12-21 09:59:12 -08:00
vvp_scope.c Reuse the number of input information. 2009-12-18 14:00:34 -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.