ext: add the source code for DSENT

This patch adds a tool called DSENT to the ext/ directory.  DSENT
is a tool that models power and area for on-chip networks.  The next
patch adds a script for using the tool.

1 files changed, 95 insertions, 0 deletions

diff --git a/ext/dsent/model/timing_graph/ElectricalDriver.cc b/ext/dsent/model/timing_graph/ElectricalDriver.cc
new file mode 100644
index 000000000..9456ef067
--- /dev/null
+++ b/ext/dsent/model/timing_graph/ElectricalDriver.cc
@@ -0,0 +1,95 @@
+
+#include "model/timing_graph/ElectricalDriver.h"
+#include "model/timing_graph/ElectricalNet.h"
+#include "model/ElectricalModel.h"
+
+namespace DSENT
+{
+    ElectricalDriver::ElectricalDriver(const String& instance_name_, ElectricalModel* model_, bool sizable_)
+        : ElectricalTimingNode(instance_name_, model_), m_output_res_(0.0), m_sizable_(sizable_)
+    {
+
+    }
+
+    ElectricalDriver::~ElectricalDriver()
+    {
+
+    }
+    
+    void ElectricalDriver::setOutputRes(double output_res_)
+    {
+        m_output_res_ = output_res_;
+        return;
+    }
+
+    double ElectricalDriver::getOutputRes() const
+    {        
+        return m_output_res_;
+    }
+
+    double ElectricalDriver::calculateDelay() const
+    {
+        return 0.693 * m_output_res_ * getTotalDownstreamCap();
+    }    
+
+    double ElectricalDriver::calculateTransition() const
+    {
+        return 1.386 * getMaxUpstreamRes() * getTotalDownstreamCap();
+    }
+
+    double ElectricalDriver::getMaxUpstreamRes() const
+    {
+        return m_output_res_;
+    }
+
+    bool ElectricalDriver::isSizable() const
+    {
+        return m_sizable_;
+    }
+    
+    bool ElectricalDriver::hasMaxDrivingStrength() const
+    {
+        if (!isSizable())
+        {
+            return true;
+        }
+        return (getModel() == NULL) || (getModel()->hasMaxDrivingStrength());
+    }
+
+    bool ElectricalDriver::hasMinDrivingStrength() const
+    {
+        if (!isSizable())
+        {
+            return true;
+        }
+        return (getModel() == NULL) || (getModel()->hasMinDrivingStrength());
+    }
+    
+    void ElectricalDriver::increaseDrivingStrength()
+    {
+        ASSERT(isSizable(), "[Error] " + getInstanceName() + 
+            " -> Attempted to size up unsizable driver!");
+        if(!hasMaxDrivingStrength())
+        {
+            getModel()->increaseDrivingStrength();
+        }
+        return;
+    }
+
+    void ElectricalDriver::decreaseDrivingStrength()
+    {
+        ASSERT(isSizable(), "[Error] " + getInstanceName() + 
+            " -> Attempted to size down unsizable driver!");
+        if(!hasMinDrivingStrength())
+        {
+            getModel()->decreaseDrivingStrength();
+        }
+        return;
+    }
+    
+    bool ElectricalDriver::isDriver() const
+    {
+        return true;
+    }    
+} // namespace DSENT
+