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, 45 insertions, 0 deletions

diff --git a/ext/dsent/model/optical_graph/OpticalDetector.h b/ext/dsent/model/optical_graph/OpticalDetector.h
new file mode 100644
index 000000000..e3994f176
--- /dev/null
+++ b/ext/dsent/model/optical_graph/OpticalDetector.h
@@ -0,0 +1,45 @@
+#ifndef __DSENT_MODEL_OPTICALGRAPH_OPTICALDETECTOR_H__
+#define __DSENT_MODEL_OPTICALGRAPH_OPTICALDETECTOR_H__
+
+#include "model/optical_graph/OpticalNode.h"
+#include "util/CommonType.h"
+
+namespace DSENT
+{
+    class OpticalReceiver;
+
+    class OpticalDetector : public OpticalNode
+    {
+        public:
+            OpticalDetector(const String& instance_name_, OpticalModel* model_, const WavelengthGroup& wavelengths_, OpticalReceiver* receiver_);
+            ~OpticalDetector();
+
+        public:
+            // Set the responsitivity of the photodetector
+            void setResponsivity(double responsivity_);
+            
+            // Get the detector sensitivity given an extinction ratio (in Watts)
+            double getSensitivity(double ER_dB_) const;
+            
+            // Ask the receiver for its power (ONLY use for power optimization, as this
+            // assumes an activity of 1.0)
+            double getPower() const;
+        
+        private:
+            // Disable copy constructor
+            OpticalDetector(const OpticalDetector& node_);            
+        
+        private:
+            // The required laser power
+            double m_sensitivity_;
+            // The receiver connected to this detector
+            OpticalReceiver* m_receiver_;
+            // Responsivity of the photodetector
+            double m_responsivity_;
+        
+    };
+    
+} // namespace DSENT
+
+#endif // __DSENT_MODEL_OPTICALGRAPH_OPTICALDETECTOR_H__
+