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USB communication errors with ADAU1442



		

			

									
					    ian
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 26, 2010 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    
 
    I am having problems with USB communications errors with the ADAU1442. The first download works correctly, subsequent downloads occasionally work but more often than not fail. Occasionally a download appears ok but is corrupt in some way.
    
 
    I have the SCK and SDA pins pulled high with 2k2 resistors to 3V3. The only other device on the I2C bus is the self boot memory. All traces are gaurded and signal integrity looks fine.
    
 
    Suggestions please?
    
 
    Cheers
    
 
    Ian.
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Sep 3, 2010 6:28 PM
            
            
					
        
	
        

		
		
        
					
        The reset is cleanly generated with a DS1818. I have no problem programming the device after a reset, the problem is reprogramming it after I have made changes to the design. The link compile download from sigma usually fails on the second download as if the device still retains something from the previous download.
        
 
        Having to reset is a bit of a pain as it also resets another processor on the PCB...
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Sep 3, 2010 6:28 PM
            
            
					
          
	
          

		
		
          
					
          The reset is cleanly generated with a DS1818. I have no problem programming the device after a reset, the problem is reprogramming it after I have made changes to the design. The link compile download from sigma usually fails on the second download as if the device still retains something from the previous download.
          
 
          Having to reset is a bit of a pain as it also resets another processor on the PCB...
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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