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AD2437 Pre release
The AD2437 A2B® transceiver provides a multichannel, I2S/TDM link over distances of up to 30 m between nodes. It embeds bidirectional synchronous pulse...
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AD2437 on Analog.com

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Response Cycles Calculation with SPI tunneling

    
		

			

									
					    StevenNob
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 6, 2024 
				
			
			
		
    
		
     
				
		
    
		    		    
		    
		    		      		            		        
    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  AD2437  
    
    		        		    		    	
			
    I have some questions about the calculation of response cycles. First of all, in the TRM at page 7-15 in the formula of RESPCYCS_UP[x] the value of RESPOFFS is
    equal to 254 while in table 7-2 the admitted values are 238, 245, 248. Can you explain why?

    Another question is, If I use the SPI data tunneling the value of RESPCYCS changes?Therefore, do I have to consider the slots used by data tunneling to calculate the
    response cycles?
    I'm asking this because the value of response cycles calculated by the SS+ (0x7A) doesn't match the value calculated with the formula B of the TRM (0x84). 

    I attach the sheet used to calculate the response cycles and the stream configuration. The main node is configured with TDM2 and 32 bits of TDM data width.
    RESPCYCS_formula.xlsx.

     
    
									
			        
		
    

				
						
        

    
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                 Datasheet/Specs
                
                                                    
                 AD2437
                
                                                    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 22, 2024 8:48 AM
            

            
					
      
	
      

		
		
      
					
      Hi  
      

      could you give the details about the Sigma studio version and a2b plugin you are using for this calculation. Lets check that first.
      

      StevenNob said:
      Can you explain why?
      

      Could you try the response cycle formula used in AD2428 technical reference manual and compute it for further calculation
      

      StevenNob said:
      Another question is, If I use the SPI data tunneling the value of RESPCYCS changes?Therefore, do I have to consider the slots used by data tunneling to calculate the
      response cycles?
      

      Yes
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Dec 5, 2024 10:31 AM
            

            
												
						in reply to arunk
					
									
        
	
        

		
		
        
					
        arunk said:
        could you give the details about the Sigma studio version and a2b plugin you are using for this calculation. Lets check that first
        

        Version 2.2.0 (Update 2)
        

        arunk said:
        Could you try the response cycle formula used in AD2428 technical reference manual and compute it for further calculation
        

        The formula used in AD2428 TRM is the Formula A and I have already implemented. The result is similar with Formula B with few nodes and short cables.
        

        But the question remains, what is the correct value of RESPOFFS? Why in the AD243x-TRM RESPOFFS is 254?
         
        Thank you.
        Steven
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
						
                            
            
            				
            
                on Feb 3, 2025 6:53 AM
            

            
												
						in reply to StevenNob
					
									
        
	
        

		
		
        
					
        Response Cycle Offset ensures that sufficient internal processing time (tIP) is available from the reception of the last upstream data bit in the receive buffer to the point at which this I2S/TDM data is output. This has been considered in the sigma studio and sigmastudio+ plugins, and if you are calculating by your own you need to fill it with the appropriate value based on the use case.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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