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DS90UB960-Q1: about output signal on DS90UB960

Shin hosung
Prodigy 100 points
Part Number: DS90UB960-Q1

Dear,

I had used the DS90UB960 like below block diagram.

And, It works very well. ( used the 4 camera )

But, when it's without camera, I find some signal like below picture 1,2,3,4 numbers

It's 50pin(RIN0+), 53pin(RIN1+), 59pin(RIN2+), 62pin(RIN3+).

This some signal is like below picture

Please, let me know this signal.

What is this signal used for ?

 

best regards,

hosung shin.

  • 0
    TI__Expert 6345 points

    Hi Hosung,

    The signal you are observing is the back channel signal. It is used for communicating from the deserializer side to the serializer side, in your case, from the 960 to the camera modules. This signal can be used for many things, like I2C communication, lower speed data transfer, etc

    Regards, 

    Vivaan Jaiswal

  • 0 in reply to Vivaan Jaiswal
    Prodigy 100 points

    Hi Vivaan,

    Thanks you for your support.

    Then....

    If I don't need to use for communicating from the deserialize side to the serializer side ( from the 960 to the camera modules ).

    Then, When I remove this back channel signal, What problem I meet ?

    ( for example, When I change the 0x58 register for remove this back channel signal, and this video from camera works )

    best regards,

    hosung shin.

  • 0
    TI__Expert 6345 points

    Hi Hosung,

    In order for me to best help you, I need to understand your setup a little better. What mode are you using for your setup? Could you elaborate a little on why you're testing without the camera modules?

    Regards,

    Vivaan Jaiswal

  • 0 in reply to Vivaan Jaiswal
    Prodigy 100 points

    Hi Vivaan,

    No, I used the camera module.

    I means..

    Our camera module is special camera ( fixed format, fixed power, etc ) , then I don't control by the deserializer.

    Then, I don't need the back channel signal. and I want to remove this back channel signal.

    And, I change the register 0x58's value from 0x58 to 0x00

    Then, I remove this back channel signal.

    Also, our camera module work on this state

    As finally, I want to check if there are no other side effect's issue in our state.

    

    best regards,
    

    hosung shin.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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                          TI__Expert
                        6345 points
                      
    
                          
                   		
		
    
					
    Hi Hosung,
    

    Disabling the back channel can have different effects on performance depending on what mode you are in. Are you going to be using synchronous or asynchronous mode for your implementation? If the camera module works without a back channel in your testing, I think you might be in asynchronous mode.
    

    Regards,
    

    Vivaan
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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                          Prodigy
                        100 points
                      
    
                          
                   		
		
    
					
    Hi Vivaan,
    

    Yes, you are right.  
    

    I used the asynchronous mode. also I used the 720P(1280x720) 30frame.
    

    As you said, If I remove the back channel signal, how much does performance drop ( our base is 720P30hz ) ?
    

    best regards,
    

    hosung shin.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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                          TI__Expert
                        6345 points
                      
    
                          
                   		
		
    
					
    Hi Hosung,
    

    You can disable the back channel without any performance drop, however, you will not be able to communicate to the camera modules through I2C.
    

    Regards,
    

    Vivaan
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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                          Prodigy
                        100 points
                      
    
                          
                   		
		
    
					
    Hi Vivaan,
    

    Thanks for your support.
    

    In finally, If I remove the back channel signal at synchronous mode, how much does performanc drop ? ( It's base's 720P30hz )
    

    ( When it's synchronous mode, I use the 4 camera. also, one camera is 720P 30hz  )
    

    best regards,
    

    hosung shin.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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                          TI__Expert
                        6345 points
                      
    
                          
                   		
		
    
					
    Hi Hosung, 
    

    In synchronous mode, the back channel is used to create the forward channel which allows communication and data transfer from the camera module to the 960. If you disable the back channel min synchronous mode, there will be no forward channel created, and, therefore, no lock or data transfer between the camera and the 960. You will need the back channel for proper function in synchronous mode. 
    

    Regards, 
    

    Vivaan 
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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                          Prodigy
                        100 points
                      
    
                          
                   		
		
    
					
    Hi Vivaan,
    

    Thanks for your support.
    

    best regards,
    

    hosung shin.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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