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, 42 insertions, 0 deletions

diff --git a/ext/dsent/model/timing_graph/ElectricalDriverMultiplier.h b/ext/dsent/model/timing_graph/ElectricalDriverMultiplier.h
new file mode 100644
index 000000000..62b14569f
--- /dev/null
+++ b/ext/dsent/model/timing_graph/ElectricalDriverMultiplier.h
@@ -0,0 +1,42 @@
+#ifndef __DSENT_MODEL_ELECTRICAL_DRIVER_MULTIPLIER_H__
+#define __DSENT_MODEL_ELECTRICAL_DRIVER_MULTIPLIER_H__
+
+#include "util/CommonType.h"
+#include "model/timing_graph/ElectricalTimingNode.h"
+
+namespace DSENT
+{
+    // Simple class that can be used to mimic the presence of multiple drivers
+    // output drivers (each driving one of the downstream loads) when only one
+    // such driver has been instantiated (such as models that take advantage of
+    // bit duplicattion). When the downsream loads differ in load cap, it
+    // just returns the largest of the caps
+    class ElectricalDriverMultiplier : public ElectricalTimingNode
+    {
+        public:
+            ElectricalDriverMultiplier(const String& instance_name_, ElectricalModel* model_);
+            virtual ~ElectricalDriverMultiplier();
+
+        public:
+            // Calculate drive resistance of this node;
+            double calculateDriveRes(double input_drive_res_) const;
+            // Calculate wiring delay (or net delay)
+            double calculateDelay() const;
+            // Calculate transition
+            double calculateTransition() const;
+            // get total amount of downstream load capacitance 
+            double getTotalDownstreamCap() const;
+            
+        private:
+            // Disable copy constructor
+            ElectricalDriverMultiplier(const ElectricalDriverMultiplier& net_);
+
+        private:
+            // Name of this instance
+            String m_instance_name_;
+    };
+    
+} // namespace DSENT
+
+#endif // __DSENT_MODEL_ELECTRICAL_DRIVER_MULTIPLIER_H__
+