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How to disconnect the DPI pin from device in SRU?



		

			

									
						Afinko
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Apr 12, 2010 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi,

 
I use SRU to connect the DPI pins to the UART:

 
SRU2(UART0_TX_O,DPI_PB14_I);
 SRU2(DPI_PB13_O,UART0_RX_I);

 
In the next code, I need to connect another DPI pins to the UART, the ADSP-21371 has only one UART, so firstly I need to disconnect DPI 13 and DPI 14 from UART and connect another DPI pins, e.g. DPI 01 and DPI 02. How to do this correctly?

 
Thanks in advance,

 
Afi

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			


				
	









	
    
	

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                                 Analog Employees 
                                
                            
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                on Apr 13, 2010 7:09 PM
            
            
					
    
	
    

		
		
    
					
    Hi Afinko,
    
 
     The ADSP-21368 HRM gives you information on what to do with the unused SRU pins.
    
 
       
    
 
    "If a DAI/DPI pin is not being used, the pin enable (for example DAI_PBxx_I ) for its pin buffer should be connected to LOW and its  associated bit in the DAI_PIN_PULLUP register should be set (= 1) to enable a 22.5 k Ω pull-up resistor for that pin."
    
 
     
    
 
     
    
 
     So for your case, set the bits for 13 and 14 to be high in the DPI_PIN_PULLUP register, tie the pin buffer input to LOW. -> SRU(LOW,DPI_PB14_I) 
    
 
    Then you can connect pin 1 and 2 to UART signals.
    
 
    
 
      
     
 
    
 
    Hope this helps,
    
 
    Deepa
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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