Updated README and fixed transition timing for flexible refresh

DRAMSys/library/src/controller/core/refresh/RefreshManager.cpp

@@ -215,7 +215,7 @@ void RefreshManager::scheduleRefresh(tlm::tlm_generic_payload& payload __attribu
             if(arCmdCounter == 0) // All bursts issued, next state will align to tREFI
             {
                 nextState = ST_ALIGN;
-                nextRefTiming = timing.tREFI;
+                nextRefTiming = SC_ZERO_TIME;
             }
             else
             {

README.md

@@ -635,6 +635,8 @@ Below, the sub-configurations are listed and explained.
   - *ControllerCoreMaxPulledInARCmd* (unsigned int)
     - Max AR commands to be pulled-in.
 
+For further details on the Flexible Refresh feature, please refer to [this](DRAMSys/docs/flexible-refresh.pdf) document.
+
 - **Trace Setups**
   - *clkMhz* (unsigned int)
     - Speed of the trace player