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Internal documentation of UDP devices.

This commit is contained in:
steve 2003-09-17 03:39:55 +00:00
parent 31c0a9dcd1
commit ed792c5321
2 changed files with 52 additions and 26 deletions
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9
vvp/udp.cc
View File

@ -18,7 +18,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: udp.cc,v 1.23 2003/09/13 00:59:02 steve Exp $"
#ident "$Id: udp.cc,v 1.24 2003/09/17 03:39:55 steve Exp $"
#endif
#include "udp.h"
@ -49,6 +49,10 @@ void udp_functor_s::set(vvp_ipoint_t i, bool push, unsigned val, unsigned)
// UDP, then push according to the push flag. However, do
// *not* push sequential outputs. This output schedules like a
// non-blocking assignment.
// XXXX FIXME: UDP outputs should *NOT* schedule as non-
// blocking assignments. This is a hack to cope with some
// libraries that make a bad assumption.
put_oval(out, push & !udp->sequ, udp->sequ);
}
@ -372,6 +376,9 @@ void vvp_udp_s::compile_row_(udp_table_entry_t row, char *rchr)
/*
* $Log: udp.cc,v $
* Revision 1.24 2003/09/17 03:39:55 steve
* Internal documentation of UDP devices.
*
* Revision 1.23 2003/09/13 00:59:02 steve
* Comments.
*

69
vvp/udp.h
View File

@ -20,7 +20,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: udp.h,v 1.12 2003/06/17 21:28:59 steve Exp $"
#ident "$Id: udp.h,v 1.13 2003/09/17 03:39:55 steve Exp $"
#endif
#include "functor.h"
@ -50,10 +50,48 @@ struct vvp_udp_s *udp_find(char *label);
// UDP instances:
/*
* A complete UDP instance includes one udp_functor_s functor that
* holds the output of the UDP, as well as the first 4 inputs. This
* also points to the vvp_udp_s table that is the behavior for the
* device.
*
* If there are more then 4 inputs to the device, then enough
* edge_inputs_functor_s functors is created to receive all the
* inputs. All the edge_inputs_functors_s ::out members point to the
* leading udp_functor_s object, so the ::set methods all invoke the
* ::set method of this functor.
*
* +---+ First object is a udp_functor_s object
* <----+ +--
* | +--
* | +--
* | +--
* +---+
* ^
* | +---+ Subsequent objects are edge_inputs_functor_s
* \-+ +-- that point their outputs to the leading
* ^ | +-- udp_functor_s object. There are as many
* | | +-- edge_inputs_functor_s objects as needed
* | | +-- to accommodate all the inputs of the user
* | +---+ defined primitive.
* |
* | +---+
* \-+ +--
* | +--
* | +--
* | +--
* +---+
* .
* .
* .
* (The propagate method of the vvp_udp_s object relies on the fact
* that the initial udp_functor_s and the subsequend
* edge_inputs_functor_s objects are consecutive in functor space.)
*/
class udp_functor_s : public edge_inputs_functor_s
{
public:
public:
explicit udp_functor_s(vvp_udp_s *u) : udp(u) {}
void set(vvp_ipoint_t i, bool push, unsigned val, unsigned str);
vvp_udp_s *udp;
@ -62,6 +100,9 @@ public:
/*
* $Log: udp.h,v $
* Revision 1.13 2003/09/17 03:39:55 steve
* Internal documentation of UDP devices.
*
* Revision 1.12 2003/06/17 21:28:59 steve
* Remove short int restrictions from vvp opcodes. (part 2)
*
@ -77,27 +118,5 @@ public:
* Nets (wires) do not use their own functors.
* Modifications to propagation of values.
* (Stephan Boettcher)
*
* Revision 1.8 2001/07/24 01:44:50 steve
* Fast UDP tables (Stephan Boettcher)
*
* Revision 1.6 2001/05/06 03:51:37 steve
* Regularize the mode-42 functor handling.
*
* Revision 1.5 2001/04/28 20:09:05 steve
* Excessive header include.
*
* Revision 1.4 2001/04/26 15:52:22 steve
* Add the mode-42 functor concept to UDPs.
*
* Revision 1.3 2001/04/26 03:10:55 steve
* Redo and simplify UDP behavior.
*
* Revision 1.2 2001/04/24 03:48:53 steve
* Fix underflow when UDP has 1 input.
*
* Revision 1.1 2001/04/24 02:23:59 steve
* Support for UDP devices in VVP (Stephen Boettcher)
*
*/
#endif