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Add basic force/release capabilities.

This commit is contained in:
steve 2004-12-15 17:16:08 +00:00
parent 0193daa436
commit 36f36bd2ac
2 changed files with 67 additions and 7 deletions
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33
vvp/vvp_net.cc
View File

@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ident "$Id: vvp_net.cc,v 1.1 2004/12/11 02:31:30 steve Exp $"
#ident "$Id: vvp_net.cc,v 1.2 2004/12/15 17:16:08 steve Exp $"
# include "vvp_net.h"
# include <stdio.h>
@ -249,6 +249,7 @@ vvp_fun_signal::vvp_fun_signal(unsigned wid)
{
vpi_callbacks = 0;
continuous_assign_active_ = false;
force_active_ = false;
}
/*
@ -273,7 +274,10 @@ void vvp_fun_signal::recv_vec4(vvp_net_ptr_t ptr, vvp_vector4_t bit)
break;
case 2: // Force value
assert(0);
force_active_ = true;
force_ = bit;
vvp_send_vec4(ptr.ptr()->out, force_);
run_vpi_callbacks();
break;
default:
@ -287,6 +291,17 @@ void vvp_fun_signal::deassign()
continuous_assign_active_ = false;
}
void vvp_fun_signal::release(vvp_net_ptr_t ptr, bool net)
{
force_active_ = false;
if (net) {
vvp_send_vec4(ptr.ptr()->out, bits_);
run_vpi_callbacks();
} else {
bits_ = force_;
}
}
/*
* The signal functor takes commands as long values to port-3. This
* method interprets those commands.
@ -299,6 +314,12 @@ void vvp_fun_signal::recv_long(vvp_net_ptr_t ptr, long bit)
case 1: // deassign command
deassign();
break;
case 2: // release/net
release(ptr, true);
break;
case 3: // release/reg
release(ptr, false);
break;
default:
assert(0);
break;
@ -313,7 +334,10 @@ void vvp_fun_signal::recv_long(vvp_net_ptr_t ptr, long bit)
vvp_bit4_t vvp_fun_signal::value(unsigned idx) const
{
return bits_.value(idx);
if (force_active_)
return force_.value(idx);
else
return bits_.value(idx);
}
/* **** vvp_scaler_t methods **** */
@ -485,6 +509,9 @@ vvp_scaler_t resolve(vvp_scaler_t a, vvp_scaler_t b)
/*
* $Log: vvp_net.cc,v $
* Revision 1.2 2004/12/15 17:16:08 steve
* Add basic force/release capabilities.
*
* Revision 1.1 2004/12/11 02:31:30 steve
* Rework of internals to carry vectors through nexus instead
* of single bits. Make the ivl, tgt-vvp and vvp initial changes

41
vvp/vvp_net.h
View File

@ -18,7 +18,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ident "$Id: vvp_net.h,v 1.1 2004/12/11 02:31:30 steve Exp $"
#ident "$Id: vvp_net.h,v 1.2 2004/12/15 17:16:08 steve Exp $"
# include <assert.h>
@ -348,8 +348,8 @@ class vvp_fun_part : public vvp_net_fun_t {
/* vvp_fun_signal
* This node is the place holder in a vvp network for signals,
* including nets for various sort. The output from a signal is always
* a vector5, use drivers if the context needs vector8 values.
* including nets of various sort. The output from a signal is always
* a vector4, use drivers if the context needs vector8 values.
*
* If the signal is a net (i.e. a wire or tri) then this node will
* have an input that is the data source. The data source will connect
@ -360,7 +360,7 @@ class vvp_fun_part : public vvp_net_fun_t {
* %assign statements will write through port-0
*
* In any case, behavioral code is able to read the value that this
* node last propagated, by using the size(). That is important
* node last propagated, by using the value() method. That is important
* functionality of this node.
*
* Continuous assignments are made through port-1. When a value is
@ -369,6 +369,32 @@ class vvp_fun_part : public vvp_net_fun_t {
* off again. Writing into this port can be done in behavioral code
* using the %cassign/v instruction, or can be done by the network by
* hooking the output of a vvp_net_t to this port.
*
* Force assignments are made through port-2. When a value is written
* here, force mode is activated. In force mode, port-0 data (or
* port-1 data if in continuous assign mode) is tracked but not
* propagated. The force value is propagated and is what is readable
* through the value method.
*
* Port-3 is a command port, intended for use by procedural
* instructions. The client must write long values to this port to
* invoke the command of interest. The command values are:
*
* 1 -- deassign
* The deassign command takes the node out of continuous
* assignment mode. The output value is unchanged, and force
* mode, if active, remains in effect.
*
* 2 -- release/net
* The release/net command takes the node out of force mode,
* and propagates the tracked port-0 value to the signal
* output. This acts like a release of a net signal.
*
* 3 -- release/reg
* The release/reg command is similar to the release/net
* command, but the port-0 value is not propagated. Changes
* to port-0 (or port-1 if continuous assing is active) will
* propagate starting at the next input change.
*/
class vvp_fun_signal : public vvp_net_fun_t {
@ -384,6 +410,7 @@ class vvp_fun_signal : public vvp_net_fun_t {
// Commands
void deassign();
void release(vvp_net_ptr_t port, bool net);
public:
struct __vpiCallback*vpi_callbacks;
@ -392,12 +419,18 @@ class vvp_fun_signal : public vvp_net_fun_t {
vvp_vector4_t bits_;
bool continuous_assign_active_;
vvp_vector4_t force_;
bool force_active_;
private:
void run_vpi_callbacks();
};
/*
* $Log: vvp_net.h,v $
* Revision 1.2 2004/12/15 17:16:08 steve
* Add basic force/release capabilities.
*
* Revision 1.1 2004/12/11 02:31:30 steve
* Rework of internals to carry vectors through nexus instead
* of single bits. Make the ivl, tgt-vvp and vvp initial changes