Ex parte HORNE et al. - Page 5

          Appeal No. 97-1784                                                          
          Application 08/011,068                                                      

          node in a particular path within a data processing system.  The             
          tuning is done by automatically adjusting the time of arrival               
          of the clock at the selected node so as to correspond with a                
          predetermined timing so that the clock should arrive at this                

          point to initiate some desired function.  The time of arrival of            
          a clock pulse at a particular node can be controlled by selecting           
          the amount of delay inserted into the particular clock line.                
                    In column 3, line 44, through column 4, line 9, Collins           
          teaches with reference to Figure 1 that the service system 10               
          initiates an oscillator 12 which provides timed clock pulses of             
          a predetermined frequency.  An output from the oscillator 12 is             
          connected to a programmable delay chip 14.  This unit is under              
          the control of the service system 10 and provides the delay which           
          is ordered by the service system.  This delay is applied to the             
          clock pulse from the oscillator 12 producing a delayed clock                
          pulse which is then applied to various logic and array chips                
          within the system being tuned.  The delayed clock pulse is then             
          applied to the time detector unit 20 where the delayed clock                
          pulse is compared to a reference time pulse produced by a                   
          reference generator circuit 22.  The results of the comparison is           


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