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diff --git a/src/mem/tport.hh b/src/mem/tport.hh
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+/*
+ * Copyright (c) 2006 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Ali Saidi
+ */
+
+/**
+ * @file
+ * Implement a port which adds simple support of a sendTiming() function that
+ * takes a delay. In this way the * device can immediatly call
+ * sendTiming(pkt, time) after processing a request and the request will be
+ * handled by the port even if the port bus the device connects to is blocked.
+ */
+
+/** recvTiming and drain should be implemented something like this when this
+ * class is used.
+
+bool
+PioPort::recvTiming(Packet *pkt)
+{
+    if (pkt->result == Packet::Nacked) {
+        resendNacked(pkt);
+    } else {
+        Tick latency = device->recvAtomic(pkt);
+        // turn packet around to go back to requester
+        pkt->makeTimingResponse();
+        sendTiming(pkt, latency);
+    }
+    return true;
+}
+
+PioDevice::drain(Event *de)
+{
+    unsigned int count;
+    count = SimpleTimingPort->drain(de);
+    if (count)
+        changeState(Draining);
+    else
+        changeState(Drained);
+    return count;
+}
+*/
+
+#ifndef __MEM_TPORT_HH__
+#define __MEM_TPORT_HH__
+
+#include "mem/port.hh"
+#include "sim/eventq.hh"
+#include <list>
+#include <string>
+
+class SimpleTimingPort : public Port
+{
+  protected:
+    /** A list of outgoing timing response packets that haven't been serviced
+     * yet. */
+    std::list<Packet*> transmitList;
+    /**
+     * This class is used to implemented sendTiming() with a delay. When a delay
+     * is requested a new event is created. When the event time expires it
+     * attempts to send the packet. If it cannot, the packet is pushed onto the
+     * transmit list to be sent when recvRetry() is called. */
+    class SendEvent : public Event
+    {
+        SimpleTimingPort *port;
+        Packet *packet;
+
+        SendEvent(SimpleTimingPort *p, Packet *pkt, Tick t)
+            : Event(&mainEventQueue), port(p), packet(pkt)
+        { setFlags(AutoDelete); schedule(curTick + t); }
+
+        virtual void process();
+
+        virtual const char *description()
+        { return "Future scheduled sendTiming event"; }
+
+        friend class SimpleTimingPort;
+    };
+
+
+    /** Number of timing requests that are emulating the device timing before
+     * attempting to end up on the bus.
+     */
+    int outTiming;
+
+    /** If we need to drain, keep the drain event around until we're done
+     * here.*/
+    Event *drainEvent;
+
+    /** Schedule a sendTiming() event to be called in the future. */
+    void sendTiming(Packet *pkt, Tick time)
+    { outTiming++; new SimpleTimingPort::SendEvent(this, pkt, time); }
+
+    /** This function is notification that the device should attempt to send a
+     * packet again. */
+    virtual void recvRetry();
+
+    void resendNacked(Packet *pkt);
+  public:
+
+    SimpleTimingPort(std::string pname)
+        : Port(pname), outTiming(0), drainEvent(NULL)
+    {}
+
+    unsigned int drain(Event *de);
+
+    friend class SimpleTimingPort::SendEvent;
+};
+
+#endif // __MEM_TPORT_HH__