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BF51x Hardware Reference Error

		
		

		

			

									
						mc21
					
							

			
				
									
											
			        
                                                			
				
			
		


				
		

		    
		    
		    		    
			
On page 6-30 there is a prohibited DMA situation regarding DMA word sizes not being compatible with a mapped peripheral that points to a table as reference but the table it points to is about descriptor sizes and flow variable compatibility. I can't seem to find this table anywhere in the hardware reference. If this table doesn't exist is there information available somewhere regarding word size compatibility and various peripherals on the board (specifically the RSI).




Thanks

										


				Adding more tags so someone answers hopefully

[edited by: mc21 at 2:43 PM (GMT -5) on 10 Jan 2022]
				

					


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			


				
	









	
    
	

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    I have also recently run into this issue and would love to know if there's any more information available about word size compatibility with various interefaces on the board
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

    

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    Hi,

    Apology for the delayed response.

    We can't have a table on HRM it is missing. Can you please refer the Individual chapters in HRM.

    Regards,
    Anand Selvaraj.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

    

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						in reply to Anand Selvaraj
					
									
    
	
    

		
		
    
					
    Hello,
    

    I'm not quite sure what you mean. I'm talking about the ADSP-BF51X Blackfin Processor Hardware Reference Revision 1.2 (available here). In chapter 6 (Direct Memory Access), page 30 it says, "DMAx_CONFIG word size (WDSIZE) is not supported by the mapped peripheral. See Table 6-2." When you go to Table 6-2 (page 31) the table name is "Legal NDSIZE Values" and the content is about NDSIZE values instead of WDSIZE values. I believe that there should be another table that shows the various peripherals that can be accessed by DMA and the legal WDSIZEs that can be used for each. Specifically, when I use DMA with the RSI peripheral the transfers work with word sizes of 32 bits but they do not work with word sizes of 16 bits (everything else remains the same).
    

    Thanks
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

    

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						in reply to mc21
					
									
    
	
    

		
		
    
					
    Hi,

    Sorry for the inconvenience.

    That table unfortunately was never added in to any manuals and has been missing, as it appears. Since this is legacy product, we discussed internally further and figured out that this information was not added.

    Regards,
    Anand Selvaraj.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

    

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