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ADIN1110 Recommended for New Designs
The ADIN1110 is an ultra low power, single port, 10BASE-T1L transceiver design for industrial Ethernet applications and is compliant with the IEEE® 802...
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ADIN1110 on Analog.com

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ADIN1110 SPI clarification (Turn around field, SPI Packet clarification)



		

			

									
					    DmitryVasilenko
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 17, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi, colleagues!
    

    While evaluating ADIN1110 we need to clarify:
    

      

    1. Pls advise what is the purpose of the turn around (TA) field in the generic SPI protocol reading package? In the documentation, this term occurs exactly once, and clarification is not obvious.
      2. 

    2. The documentation says that SPI packets should be multiples of four bytes, however, for example, only 55 bits are described in Table 19. Apparently, the exchange will still consist of 64 bits, 32 of which represent a command, and 32 - the response of the chip. Then we must assume that bits 63 to 56 are reserved. Apparently, they need to be set to zero. Is it a correct understanding?
      3. 

    
									
			        
		
    

				
						
        

    
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                 adin1110
                
                                                    
                 Industrial Ethernet Solutions
                
                                                    
                 Industrial Ethernet Physical Layer Devices
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hi Dmitry,
      

      Apologies for the late reply.
      

      Regarding your two questions:
      

      1) The TurnAround field is an 8-SCLK cycle separation between the data you send in the SDI, and when the ADIN1110 starts sending data on the SDO. You can set this TA field to be all 0.
      

      2) The access to the register map needs to be multiple of 4-bytes, not the SPI frame itself. Rephrasing that, it is the payload of the SPI transaction what needs to be a multiple of 4-bytes. For example:
      

      -If you look at Table 18, the data you send to the ADIN1110 is 32-bits
      

      -If you look at Table 19, the data you receive from the ADIN1110 is 32-bits.
      

      -In table 20, doing a burst write, the data you send to the ADIN1110 is 64-bits (2x4-bytes)
      

      -In table 21, doing a burst read, the data you receive from the ADIN1110 is 64-bits (2x4-bytes).
      

      So going back to the transaction in Table 19. the SPI frame is 56 bits long; there are no bits 63 to 56. Bits 55 to 32 is the read command, and bits 31 to 0 (1x4-byte) is the data read back from the ADIN1110.
      

      

      I hope this clarifies your queries. Please don't hesitate to ask for more assistance.
      

      Kind regards,
      

      Raquel.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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						in reply to RGrau
					
									
        
	
        

		
		
        
					
        Hello Raquel,
        

        studying the datasheet of the ADIN1110 I had the same questions as Dimitry and you answered it almost. But still one thing is not clear for me:
        When I use the burst write (table 20). Is the data that I can send limited to 64 Bits (2x4 Bytes) or can I extend the data field as long as necessary? With the naming "burst" I would assume to extend this. Otherwise it would be simply a doubling of the write command from table 18.
        

        Thank you.
        

        Jürgen
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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