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Reading ADSP-21261 Processor with minimal components



		

			

									
					    diydsp
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 29, 2015 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi
    
 
    Is it possible to read a SHARC processor ID WITHOUT the SPI flash installed, via the ICE tool ? I developed a custom board and doing basic tests like power and processor communication,  the only components populated are X2 4.7k pull-up resistors (FOR THE JTAG LINE ), is it possible to read the processor with minimal amount of components ?
    
 
    The processor is a ADSP-21261. (also the 25.00MHZ oscillator crystal is NOT connected), So far I cannot communicate with the processor at all.
    
 
    I need this to verify that the power supply and processor is working.
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Audio Signal Processors
                
                                                    
                 sharc21261
                
                                                    
                 SHARC Audio Processors/SoCs
                
                                                    
                 ADSP-21261
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Sep 30, 2015 4:03 AM
            
            
					
      
	
      

		
		
      
					
      Hi,
      
 
      Yes, even without a SPI Flash device you should be able to connect to the processor via JTAG . But for this to work , you have to make sure that the power, JTAG circuitry is correct (refer to the ADSP-21261 EzKit Schematic) and a proper Clock input source. Also the processor input pins should not be left floating(CLKCFGx, BOOTCFGx, CLKIN etc )Generally the datasheet pin description will have this information. Once you get these basic things right, you should be able to connect the processor through JTAG with the help of ICE
      
 
      Regards,
      
 
      Mahesh 
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Sep 30, 2015 4:03 AM
            
            
					
      
	
      

		
		
      
					
      Hi,
      
 
      Yes, even without a SPI Flash device you should be able to connect to the processor via JTAG . But for this to work , you have to make sure that the power, JTAG circuitry is correct (refer to the ADSP-21261 EzKit Schematic) and a proper Clock input source. Also the processor input pins should not be left floating(CLKCFGx, BOOTCFGx, CLKIN etc )Generally the datasheet pin description will have this information. Once you get these basic things right, you should be able to connect the processor through JTAG with the help of ICE
      
 
      Regards,
      
 
      Mahesh 
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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