Products Mentioned

AD2428 Production
The Automotive Audio Bus (A2B®) provides a multichannel, I2S/TDM link over distances of up to 15 m between nodes. It embeds bidirectional synchronous...
Datasheet
AD2428 on Analog.com

ADAU1467 Recommended for New Designs
The ADAU1463/ADAU1467 are automotive qualified audio processors that far exceed the digital signal processing capabilities of earlier SigmaDSP® devices...
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ADAU1467 on Analog.com

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TDM Channel Configuration

		            
		

			

									
					    schseb
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 28, 2024 
				
			
			
		
    
		
     
				
		
    
		    		    
		    
		    		      		            		        
    Category: Software
    
    		        		            		    
    Product Number:  AD2428  
    
    		        		        		        
    Software Version: SS+ 2.1
    
    		    		    	
			
    Hello!
    


    I have a question regarding the TDM interface of the AD2428. I would like to transmit 8 channels of TDM from peripheral ADCs on a subnode plus 4 channels of TDm from PDM mics, also connected to the subnode. The mainnode recieves these signals and outputs them with TDM16 to a ADAU1467 DSP. Transmission works but even though I set up the peripheral ADCs to occupy tdm slots 0-7, the signals end up in all kinds of slots in SS+. Is there a way to configure the a²b transmission in a way that the slots are occupied AT LEAST consistently?
    

    Thanks,
    

    Sebastian
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Audio Signal Processors
                
                                                    
                 SS+ 2.1
                
                                                    
                 Audio Products
                
                                                    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Feb 28, 2024 7:11 AM
            
                                    
					
      
	
      

		
		
      
					
      Hi  ,
      

      Initially you can configure the Stream Configuration Data, then do pin assignments for the Subnode0 and Main node. Then configure the PDM and TDM data at subnode0 and then main node. 
      

      If you don't enable the Manual Slot Configuration, then the System automatically selects the upstream/downstream on each node. You can do it first and check if the slot assignments are still corrupted or not.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Feb 28, 2024 7:45 AM
            
                                    
												
						in reply to arunk
					
									
        
	
        

		
		
        
					
        Hi  ,
        

        thank you for answering. It might be worth mentioning, that I use SigmaStudio+. Could you point me in the right direction, where can I configure the PDM and TDM data? I know I can configure the number of slots passed upstream/downstream und how many PDM slots I want to use, but the actual sequence of slots, i.e. which signal goes into what slot, I don't know how to configure that. I found settings like "Audio Slots to consume" or "Slots contributed" but there has to be a way to set the slot number per signal/sensor, so it is consistent.

        Thank you!
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Feb 28, 2024 7:45 AM
            
                                    
												
						in reply to arunk
					
									
          
	
          

		
		
          
					
          Hi  ,
          

          thank you for answering. It might be worth mentioning, that I use SigmaStudio+. Could you point me in the right direction, where can I configure the PDM and TDM data? I know I can configure the number of slots passed upstream/downstream und how many PDM slots I want to use, but the actual sequence of slots, i.e. which signal goes into what slot, I don't know how to configure that. I found settings like "Audio Slots to consume" or "Slots contributed" but there has to be a way to set the slot number per signal/sensor, so it is consistent.

          Thank you!
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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