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, 57 insertions, 0 deletions

diff --git a/ext/dsent/model/timing_graph/ElectricalDriver.h b/ext/dsent/model/timing_graph/ElectricalDriver.h
new file mode 100644
index 000000000..604206b5d
--- /dev/null
+++ b/ext/dsent/model/timing_graph/ElectricalDriver.h
@@ -0,0 +1,57 @@
+#ifndef __DSENT_MODEL_ELECTRICAL_DRIVER_H__
+#define __DSENT_MODEL_ELECTRICAL_DRIVER_H__
+
+#include "util/CommonType.h"
+#include "model/timing_graph/ElectricalTimingNode.h"
+
+namespace DSENT
+{
+    class ElectricalModel;
+
+    class ElectricalDriver : public ElectricalTimingNode
+    {
+        public:
+            ElectricalDriver(const String& instance_name_, ElectricalModel* model_, bool sizable_);
+            virtual ~ElectricalDriver();
+
+        public:
+            // Set the output resistance of this driver
+            void setOutputRes(double output_res_);            
+            // Get the output resistance of this driver
+            double getOutputRes() const;
+            // Calculate delay due to total load capacitance
+            double calculateDelay() const;
+            // Calculate transition
+            double calculateTransition() const;
+            // get maximum of upstream drive resistance
+            double getMaxUpstreamRes() const;
+            
+            // Get whether the driver is sizable
+            bool isSizable() const;
+            // Return true if the instance has minimum driving strength
+            bool hasMinDrivingStrength() const;
+            // Return true if the instance has maximum driving strength
+            bool hasMaxDrivingStrength() const;
+            // Increase driving strength index by 1
+            void increaseDrivingStrength();
+            // Decrease driving strength index by 1
+            void decreaseDrivingStrength();
+                        
+            bool isDriver() const;                        
+                        
+        private:
+            // Disable copy constructor
+            ElectricalDriver(const ElectricalDriver& port_);
+
+        private:
+            // Name of this instance
+            String m_instance_name_;
+            // Output resistance
+            double m_output_res_;
+            // Sizable flag
+            bool m_sizable_;
+    };
+} // namespace DSENT
+
+#endif // __DSENT_MODEL_ELECTRICAL_DRIVER_H__
+