diff --git a/src/register/hei_register.hpp b/src/register/hei_register.hpp
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+++ b/src/register/hei_register.hpp
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+#pragma once
+
+// Module Description **************************************************
+//
+//  Description:  This module contains the declarations for the
+//                Processor Runtime Diagnostics Scan Communication
+//                Register class.
+//
+//  Notes:  Unless stated otherwise, assume that each function
+//          specification has no side-effects, no dependencies, and
+//          constant time complexity.
+//
+// End Module Description **********************************************
+
+
+//----------------------------------------------------------------------
+//  Includes
+//----------------------------------------------------------------------
+
+#include <iipbits.h>
+#include <iipconst.h>
+#include <iipsdbug.h>
+#include <prdfMain.H>
+#include <prdfTrace.H>
+
+namespace libhei
+{
+
+/*--------------------------------------------------------------------*/
+/*  Forward References                                                */
+/*--------------------------------------------------------------------*/
+
+/*--------------------------------------------------------------------*/
+/*  User Types                                                        */
+/*--------------------------------------------------------------------*/
+
+/*--------------------------------------------------------------------*/
+/*  Constants                                                         */
+/*--------------------------------------------------------------------*/
+
+/*--------------------------------------------------------------------*/
+/*  Macros                                                            */
+/*--------------------------------------------------------------------*/
+
+/*--------------------------------------------------------------------*/
+/*  Global Variables                                                  */
+/*--------------------------------------------------------------------*/
+
+/*--------------------------------------------------------------------*/
+/*  Function Prototypes                                               */
+/*--------------------------------------------------------------------*/
+
+// Class Specification *************************************************
+//
+//  Name:  SCAN_COMM_REGISTER_CLASS
+//
+//  Title:  Scan Communication Register
+//
+//  Purpose:  SCAN_COMM_REGISTER_CLASS provides the representation
+//            and access to a physical register.
+//
+//  Usage:  This is an abstract base class.
+//
+//  Side-effects:  Memory is allocated.
+//
+//  Dependencies:  None.
+//
+//  Notes: The Scan Communication Register is a model of an actual
+// physical register.  The bits in the register are represented by the
+// bit_string data member which is modified dynamically as operations
+// are preformed.  It acts as a temporarily cached value of the
+// register.  When a read is performed, the bit values are updated in
+// the bit string. When a write is performed, the current value of the
+// bits are used as the value to write.  The current value of this
+// cached bit string can be accessed or modified by other objects via
+// the public interface.  The physical address and bit length of the
+// hardware register are set during initialization and used on all
+// acceses.
+//
+// The basic Read() and Write() functions are virtual.  The
+// actual implemenations are dependent on the actual hardware
+// and the software Hardware Manual Ops Scan Control Routines.
+// These function specifications describe a common behaviour
+// that every derived class must follow.  Additional,
+// information may also be specified.
+//
+// A Read() function is also provided that has a Bit String
+// mask parameter.  This function calls the virtual Read()
+// and then applies the mask so that the internal Bit String
+// contains the hardware register contents with certain bits
+// ignored (masked off).
+//
+//  Cardinality:  0
+//
+//  Space Complexity:  Linear
+//                     K + Mn where K and M are constants and n is the
+//                     number of bits in the register.
+//
+// End Class Specification *********************************************
+/**
+ SCAN_COMM_REGISTER_CLASS
+ @author Doug Gilbert
+ @V5R2
+ */
+class SCAN_COMM_REGISTER_CLASS
+{
+  public: // enums, structs, typedefs
+
+    /** The register access level */
+    enum AccessLevel
+    {
+        ACCESS_NONE = 0x0, ///< No access
+        ACCESS_RO   = 0x1, ///< Read-only access
+        ACCESS_WO   = 0x2, ///< Write-only access
+        ACCESS_RW   = 0x3, ///< Read/Write access
+    };
+
+  public: // functions
+
+  /**
+   Destructor
+   */
+  virtual ~SCAN_COMM_REGISTER_CLASS(void);
+
+  /**
+   Read hardware register (virtual)
+   <ul>
+   <br><b>Parameters:  </b> None
+   <br><b>Returns:     </b> [SUCCESS | MOPs return code]
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> Internal bit string represents the value of the
+                            hardware register (if rc == SUCCESS)
+   <br><b>Sideaffects: </b> Value guaranteed to be read from hardware.
+   <br><b>Exceptions:  </b> None.
+   <br><b>Notes:       </b> Default is to call Read().  If a child class cannot
+                            guarantee hardware access every time Read() is
+                            called then the function ForceRead() should be
+                            overridden.
+   </ul><br>
+   */
+  virtual uint32_t ForceRead(void) const { return Read(); }
+
+  /**
+   Read hardware register (pure virtual)
+   <ul>
+   <br><b>Parameters:  </b> None
+   <br><b>Returns:     </b> [SUCCESS | MOPs return code]
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> Internal bit string represents the value of the
+                            hardware register (if rc == SUCCESS)
+   <br><b>Sideaffects: </b> The bit string value may or may not be retrieved
+                            from hardware; a buffered copy may be used.
+   <br><b>Exceptions:  </b> None.
+   </ul><br>
+   */
+  virtual uint32_t Read(void) const = 0;
+
+  /**
+   Read hardware register and apply a mask
+   <ul>
+   <br><b>Parameters:  </b> Mask to apply
+   <br><b>Returns:     </b> [SUCCESS | MOPs return code]
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> Internal bit string represents the value of the
+                            hardware register with the bits turned off as
+                            specified by the mask.
+   <br><b>Sideaffects: </b> The bit string value may or may not be retrieved
+   from hardware. a buffered copy may be used.
+   <br><b>Exceptions:  </b> None.
+   <br><b>Notes:       </b> if bits read from hardware = '00110100'
+                            and mask =                   '01110000'
+                            then internal bit sting =    '00000100'
+
+                            if mask.Length() < GetBitString()->Length()
+                            then mask is right extended with 0's
+                            if mask.Length() > GetBitString()->Length()
+                            then extra mask bits are ignored.
+   </ul><br>
+   */
+  uint32_t Read(BitString & mask);
+
+  /**
+   Write hardware register (pure virtual)
+   <ul>
+   <br><b>Parameters:  </b> None
+   <br><b>Returns:     </b> [SUCCESS | MOPs return code]
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> Internal bit string value written to hardware
+   <br><b>Exceptions:  </b> None.
+   <br><b>Notes:       </b> If internal bitstring was never read/set/modified then
+                            zeros are written to corresponding hardware register.
+   </ul><br>
+   */
+ virtual uint32_t Write(void) = 0;
+
+  /**
+   Access a copy of the scan comm address
+   <ul>
+   <br><b>Parameters:  </b> None
+   <br><b>Returns:     </b> Returns scom address
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> None.
+   <br><b>Exceptions:  </b> None.
+   </ul><br>
+   */
+  virtual uint64_t GetAddress(void) const {return 0 ;}
+
+  /**
+   Access a copy of the short id for signatures.
+   <ul>
+   <br><b>Parameters:  </b> None
+   <br><b>Returns:     </b> ID.
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> None.
+   <br><b>Exceptions:  </b> None.
+   </ul><br>
+   */
+  virtual uint16_t GetId(void) const = 0;
+
+  /**
+   Set the short id for signatures.
+   <ul>
+   <br><b>Parameters:  </b> ID.
+   <br><b>Returns:     </b> None.
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> None.
+   <br><b>Exceptions:  </b> For virtual registers, this is not required to have
+                            any effect.
+   </ul><br>
+   */
+  virtual void SetId(uint16_t) = 0;
+
+
+  /**
+   Access the bit length of the register
+   <ul>
+   <br><b>Parameters:  </b> None
+   <br><b>Returns:     </b> bit length of the register
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> None.
+   <br><b>Exceptions:  </b> None.
+   </ul><br>
+   */
+   virtual uint32_t GetBitLength(void) const { return DEFAULT_BIT_LENGTH ;}
+
+  /**
+   Access the internal bit string (pure virtual)
+   <ul>
+   <br><b>Parameters:  </b> None
+   <br><b>Returns:     </b> ptr to the internal bit string (const)
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> None.
+   <br><b>Exceptions:  </b> None.
+   <br><b>Notes:       </b> If the internal bit string was never read/modified then
+                            all bits are zero
+   </ul><br>
+   */
+  virtual
+  const BitString * GetBitString(ATTENTION_TYPE
+                                        i_type = INVALID_ATTENTION_TYPE
+                                       ) const = 0;
+
+  /**
+   Modify the internal bit string (pure virtual)
+   <ul>
+   <br><b>Parameters:  </b> a bit string
+   <br><b>Returns:     </b> Nothing
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> Internal bit string == *bs for first len bits where
+                            len is the smaller of the two lengths.
+                            Memory may be (re)allocated
+   <br><b>Exceptions:  </b> None.
+   <br><b>Notes:       </b> The hardware register value is not modified until
+                            Write() is called
+   </ul><br>
+   */
+  virtual void SetBitString(const BitString * bs) = 0;
+
+  /**
+   SetBit
+   <ul>
+   <br><b>Parameters:  </b> Position of bit to set (= 1)
+   <br><b>Returns:     </b> None.
+   <br><b>Requirements:</b> bit position < GetBitString()->Length()
+   <br><b>Promises:    </b> GetBitString()->isBitSet(bit_position) == true
+   <br><b>Exceptions:  </b> None.
+   <br><b> Notes:      </b> Register value is not reflected in hardware until
+                            Write() is called
+   </ul><br>
+   */
+  void SetBit(uint32_t bit_position);
+
+  /**
+   ClearBit (reset bit)
+   <ul>
+   <br><b>Parameters:  </b> Position of bit to clear (= 0)
+   <br><b>Returns:     </b> None.
+   <br><b>Requirements:</b> bit position < GetBitString()->Length()
+   <br><b>Promises:    </b> GetBitString()->isBitSet(bit_position) == false
+   <br><b>Exceptions:  </b> None.
+   <br><b> Notes:      </b> Register value is not reflected in hardware until
+                            Write() is called
+   </ul><br>
+   */
+  void ClearBit(uint32_t bit_position);
+
+    /**
+     * @brief  Will query if a bit is set.
+     * @param  i_bitPos The bit position to query.
+     * @pre    The bit position must be less than GetBitString()->Length()
+     * @return TRUE if the bit is set, FALSE otherwise.
+     */
+    bool IsBitSet( uint32_t i_bitPos )
+    {  return GetBitString()->isBitSet(i_bitPos);  }
+
+    /** @brief Flushes all bits to 0. */
+    void clearAllBits();
+
+    /** @brief Flushes all bits to 1. */
+    void setAllBits();
+
+    /**
+     * @brief Returns target value from the BitString (right justified).
+     * @param i_pos   Starting position in the bit string.
+     * @param i_len   Length of target value.
+     * @pre   i_pos + i_len must be less than or equal 64 bits.
+     * @return The target value (right justified).
+     */
+    uint64_t GetBitFieldJustified( uint32_t i_pos, uint32_t i_len ) const;
+
+    /**
+     * @brief Set a field within the BitString with a value (right justified).
+     * @param i_pos   Starting position in the bit string.
+     * @param i_len   Length of target value.
+     * @param i_value Value to add to BitString.
+     * @pre   i_pos + i_len must be less than or equal 64 bits.
+     */
+    void SetBitFieldJustified( uint32_t i_pos, uint32_t i_len,
+                               uint64_t i_value );
+
+  /**
+   Query if bit string is all zeros
+   <ul>
+   <br><b>Parameters:  </b> None.
+   <br><b>Returns:     </b> [true | false]
+   <br><b>Requirements:</b> None.
+   <br><b>Promises:    </b> None.
+   <br><b>Exceptions:  </b> None.
+   </ul><br>
+   */
+  bool BitStringIsZero()
+  { return GetBitString()->isZero(); }
+
+   /**
+    *@brief    Returns TYPE_NA as type of Target associated with register.Actual
+    *          implementation is expected in derived class
+     *@return   TYPE_NA
+   */
+  virtual TARGETING::TYPE getChipType(void)const { return TARGETING::TYPE_NA; }
+
+    /** @return The register access level (see enum AccessLevel). */
+    virtual AccessLevel getAccessLevel() const { return ACCESS_RW; }
+
+    /** @brief Sets the register access level (see enum AccessLevel). */
+    virtual void setAccessLevel( AccessLevel i_op ) {}
+
+protected:
+
+  /**
+   Get modifiable reference to internal bit string (don't even thing about making this public!!!)
+   <ul>
+   <br><b>Parameters:    </b> None.
+   <br><b>Returns       </b> Reference to the internal bit string
+   <br><b>Requirments   </b> None.
+   <br><b>Promises      </b> None.
+   </ul><br>
+   */
+  virtual BitString & AccessBitString(void) = 0;
+private: // Data
+  static const int DEFAULT_BIT_LENGTH = 64;
+
+  // Enum Specification //////////////////////////////////////////////
+  //
+  // Purpose:  These enumerated constants specify implementation data.
+  //
+  // End Enum Specification //////////////////////////////////////////
+
+  enum
+  {
+    ODD_PARITY_SET_BIT_POSITION = 16
+  };
+
+  // Data Specification //////////////////////////////////////////////
+  //
+  // Purpose:  These data members specify the physical properties of
+  //           register.
+  //
+  // End Data Specification //////////////////////////////////////////
+
+
+};
+
+} // end namespace libhei
+