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, 73 insertions, 0 deletions

diff --git a/ext/dsent/model/timing_graph/ElectricalNet.cc b/ext/dsent/model/timing_graph/ElectricalNet.cc
new file mode 100644
index 000000000..09baa77e5
--- /dev/null
+++ b/ext/dsent/model/timing_graph/ElectricalNet.cc
@@ -0,0 +1,73 @@
+
+#include "model/timing_graph/ElectricalNet.h"
+#include "model/timing_graph/ElectricalLoad.h"
+
+namespace DSENT
+{
+    //-------------------------------------------------------------------------
+    // Electrical Net
+    //-------------------------------------------------------------------------
+
+    ElectricalNet::ElectricalNet(const String& instance_name_, ElectricalModel* model_)
+        : ElectricalTimingNode(instance_name_, model_), m_distributed_res_(0), m_distributed_cap_(0)
+    {
+
+    }
+
+    ElectricalNet::~ElectricalNet()
+    {
+
+    }
+
+    double ElectricalNet::calculateDelay() const
+    {
+        // Remember that this is a pi model, delay is distributed cap * distributed_res / 2 +
+        // distributed res * (other downstream caps)
+        return 0.693 * (getTotalDownstreamCap() - m_distributed_cap_ / 2) * m_distributed_res_;
+    }
+
+    double ElectricalNet::calculateTransition() const
+    {
+        return 1.386 * getMaxUpstreamRes() * (m_distributed_cap_ * 0.2 + ElectricalTimingNode::getTotalDownstreamCap());
+    }
+
+    double ElectricalNet::getMaxUpstreamRes() const
+    {
+        return m_distributed_res_ + ElectricalTimingNode::getMaxUpstreamRes();
+    }
+    
+    double ElectricalNet::getTotalDownstreamCap() const
+    {
+        return m_distributed_cap_ + ElectricalTimingNode::getTotalDownstreamCap();
+    }
+    
+    void ElectricalNet::setDistributedCap(double distributed_cap_)
+    {
+        m_distributed_cap_ = distributed_cap_;
+        return;
+    }
+
+    void ElectricalNet::setDistributedRes(double distributed_res_)
+    {
+        m_distributed_res_ = distributed_res_;
+        return;
+    }
+
+    double ElectricalNet::getDistributedCap() const
+    {
+        return m_distributed_cap_;
+    }
+
+    double ElectricalNet::getDistributedRes() const
+    {
+        return m_distributed_res_;
+    }
+    
+    bool ElectricalNet::isNet() const
+    {
+        return true;
+    }    
+    
+} // namespace DSENT
+
+