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Is there a disadvantage to setting SPDIF_RX_CTL.FASTLOCK to 1?

		
	
				

			

									
					    MichaelF91
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 30, 2025 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user asks about the disadvantages of enabling fast mode in S/PDIF receiver settings. The final answer explains that fast mode is beneficial for quick recovery from signal glitches but may compromise signal accuracy, making it less suitable for high-quality audio applications where slower, more reliable recovery is preferred.
                        	    
    
                
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    Category: Software
    
    		        		            		    
    Product Number:  ADSP-21565  
    
    		        		    		    
    
		    		    
		    			
    
			    
    The manual states that enabling fast mode has the "advantage of recovering very quickly whenever the S/PDIF receiver looses lock due to glitches in the signal".
    

    What is the disadvantage, or, to phrase it another way, is there ever any reason not to enable fast mode?
    
			
    
			
									
		                             
                        

    
    
                                            
                 Audio Signal Processors
                
                                                    
                 software
                
                                                    
                 ADSP-21565
                
                                                    
                 SHARC Audio Processors/SoCs
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 3, 2025 12:33 AM
            
            
						
			            		
      
		
										+1
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi Michael,
      

      Fast mode is useful when quick recovery is more important than signal accuracy.
      for example, in consumer or real-time systems where occasional instability is acceptable. But if you need high-quality audio and can tolerate slightly slower recovery, normal mode is safer and more reliable.
      

      Regards,
      Nandini C
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 3, 2025 12:33 AM
            
            
						
			            		
      
		
										+1
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi Michael,
      

      Fast mode is useful when quick recovery is more important than signal accuracy.
      for example, in consumer or real-time systems where occasional instability is acceptable. But if you need high-quality audio and can tolerate slightly slower recovery, normal mode is safer and more reliable.
      

      Regards,
      Nandini C
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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